Abstract

The influence of muscle fiber motion during exercise on diffuse correlation spectroscopy (DCS) measurements of skeletal muscle blood flow is explored. Isotonic (with muscle fiber motion) and isometric (without muscle fiber motion) plantar flexion exercises were performed at 30% of maximal force on a dynamometer, and muscle blood flow was continuously monitored on the medial gastrocnemius (calf) muscle of a healthy volunteer using DCS. During exercise, dynamometer recordings including footplate position, footplate angular velocity, and plantar flexion torque were obtained. Muscle fiber motions introduced artifacts into the DCS signals, causing an overestimation of blood flow changes. We show how proper co-registration of dynamometer recordings and DCS measurements enables separation of the true blood flow responses during exercise from those affected by the motion artifacts.

© 2010 OSA

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2010

T. Durduran, R. Choe, W. B. Baker, and A. G. Yodh, “Diffuse optics for tissue monitoring and tomography,” Rep. Prog. Phys. 73(7), 076701 (2010).
[CrossRef]

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

2009

2008

2007

2006

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

2005

G. Yu, T. Durduran, G. Lech, C. Zhou, B. Chance, E. R. Mohler, and A. G. Yodh, “Time-dependent blood flow and oxygenation in human skeletal muscles measured with noninvasive near-infrared diffuse optical spectroscopies,” J. Biomed. Opt. 10(2), 024027 (2005).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, H. W. Wang, M. E. Putt, H. M. Saunders, C. M. Sehgal, E. Glatstein, A. G. Yodh, and T. M. Busch, “Noninvasive monitoring of murine tumor blood flow during and after photodynamic therapy provides early assessment of therapeutic efficacy,” Clin. Cancer Res. 11(9), 3543–3552 (2005).
[CrossRef] [PubMed]

Y. L. Song, J. G. Kim, R. P. Mason, and H. L. Liu, “Investigation of rat breast tumour oxygen consumption by near-infrared spectroscopy,” J. Phys. D Appl. Phys. 38(15), 2682–2690 (2005).
[CrossRef]

T. Durduran, R. Choe, G. Yu, C. Zhou, J. C. Tchou, B. J. Czerniecki, and A. G. Yodh, “Diffuse optical measurement of blood flow in breast tumors,” Opt. Lett. 30(21), 2915–2917 (2005).
[CrossRef] [PubMed]

2004

2003

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

P. Schmitt, M. Kotas, A. Tobermann, A. Haase, and M. Flentje, “Quantitative tissue perfusion measurements in head and neck carcinoma patients before and during radiation therapy with a non-invasive MR imaging spin-labeling technique,” Radiother. Oncol. 67(1), 27–34 (2003).
[CrossRef] [PubMed]

G. Strangman, M. A. Franceschini, and D. A. Boas, “Factors affecting the accuracy of near-infrared spectroscopy concentration calculations for focal changes in oxygenation parameters,” Neuroimage 18(4), 865–879 (2003).
[CrossRef] [PubMed]

J. P. Culver, T. Durduran, D. Furuya, C. Cheung, J. H. Greenberg, and A. G. Yodh, “Diffuse optical tomography of cerebral blood flow, oxygenation, and metabolism in rat during focal ischemia,” J. Cereb. Blood Flow Metab. 23(8), 911–924 (2003).
[CrossRef] [PubMed]

2001

C. Cheung, J. P. Culver, K. Takahashi, J. H. Greenberg, and A. G. Yodh, “In vivo cerebrovascular measurement combining diffuse near-infrared absorption and correlation spectroscopies,” Phys. Med. Biol. 46(8), 2053–2065 (2001).
[CrossRef] [PubMed]

M. C. P. van Beekvelt, M. S. Borghuis, B. G. M. van Engelen, R. A. Wevers, and W. N. J. M. Colier, “Adipose tissue thickness affects in vivo quantitative near-IR spectroscopy in human skeletal muscle,” Clin. Sci. 101(1), 21–28 (2001).
[CrossRef] [PubMed]

1999

A. Kienle and T. Glanzmann, “In vivo determination of the optical properties of muscle with time-resolved reflectance using a layered model,” Phys. Med. Biol. 44(11), 2689–2702 (1999).
[CrossRef] [PubMed]

S. Fantini, D. Hueber, M. A. Franceschini, E. Gratton, W. Rosenfeld, P. G. Stubblefield, D. Maulik, and M. R. Stankovic, “Non-invasive optical monitoring of the newborn piglet brain using continuous-wave and frequency-domain spectroscopy,” Phys. Med. Biol. 44(6), 1543–1563 (1999).
[CrossRef] [PubMed]

J. C. Baron, “Mapping the ischaemic penumbra with PET: implications for acute stroke treatment,” Cerebrovasc. Dis. 9(4), 193–201 (1999).
[CrossRef] [PubMed]

D. Wallace, B. Michener, D. Choudhury, M. Levi, P. Fennelly, D. Hueber, and B. Barbieri, “Summary of the results of a 95 subject human clinical trial for the diagnosis of peripheral vascular disease using a near infrared frequency domain hemoglobin spectrometer,” Proc. SPIE 3597, 300–316 (1999).

1998

Z. P. Chen, T. E. Milner, X. J. Wang, S. Srinivas, and J. S. Nelson, “Optical Doppler tomography: imaging in vivo blood flow dynamics following pharmacological intervention and photodynamic therapy,” Photochem. Photobiol. 67(1), 56–60 (1998).
[CrossRef] [PubMed]

T. J. Farrell, M. S. Patterson, and M. Essenpreis, “Influence of layered tissue architecture on estimates of tissue optical properties obtained from spatially resolved diffuse reflectometry,” Appl. Opt. 37(10), 1958–1972 (1998).
[CrossRef] [PubMed]

1997

D. A. Boas and A. G. Yodh, “Spatially varying dynamical properties of turbid media probed with diffusing temporal light correlation,” J. Opt. Soc. Am. A 14(1), 192–215 (1997).
[CrossRef]

H. M. Kooijman, M. T. E. Hopman, W. N. J. M. Colier, J. A. van der Vliet, and B. Oeseburg, “Near infrared spectroscopy for noninvasive assessment of claudication,” J. Surg. Res. 72(1), 1–7 (1997).
[CrossRef] [PubMed]

M. Ferrari, T. Binzoni, and V. Quaresima, “Oxidative metabolism in muscle,” Philos. Trans. R. Soc. Lond. B Biol. Sci. 352(1354), 677–683 (1997).
[CrossRef] [PubMed]

1995

A. Duncan, J. H. Meek, M. Clemence, C. E. Elwell, L. Tyszczuk, M. Cope, and D. T. Delpy, “Optical pathlength measurements on adult head, calf and forearm and the head of the newborn infant using phase resolved optical spectroscopy,” Phys. Med. Biol. 40(2), 295–304 (1995).
[CrossRef] [PubMed]

D. A. Boas, L. E. Campbell, and A. G. Yodh, “Scattering and imaging with diffusing temporal field correlations,” Phys. Rev. Lett. 75(9), 1855–1858 (1995).
[CrossRef] [PubMed]

1994

K. K. McCully, C. Halber, and J. D. Posner, “Exercise-induced changes in oxygen saturation in the calf muscles of elderly subjects with peripheral vascular disease,” J. Gerontol. 49(3), B128–B134 (1994).
[PubMed]

1993

R. A. Blasi, M. Cope, C. Elwell, F. Safoue, and M. Ferrari, “Noninvasive measurement of human forearm oxygen-consumption by near-infrared spectroscopy,” Eur. J. Appl. Physiol. 67(1), 20–25 (1993).
[CrossRef]

D. T. Ubbink, P. J. Kitslaar, J. H. Tordoir, R. S. Reneman, and M. J. Jacobs, “Skin microcirculation in diabetic and non-diabetic patients at different stages of lower limb ischaemia,” Eur. J. Vasc. Surg. 7(6), 659–6 (1993).
[CrossRef] [PubMed]

E. Wahlberg, P. Olofsson, J. Swedenborg, and B. Fagrell, “Level of arterial obstruction in patients with peripheral arterial occlusive disease (PAOD) determined by laser Doppler fluxmetry,” Eur. J. Vasc. Surg. 7(6), 684–689 (1993).
[CrossRef] [PubMed]

1991

T. R. Cheatle, L. A. Potter, M. Cope, D. T. Delpy, P. D. C. Smith, and J. H. Scurr, “Near-infrared spectroscopy in peripheral vascular disease,” Br. J. Surg. 78(4), 405–408 (1991).
[CrossRef] [PubMed]

1988

D. J. Pine, D. A. Weitz, P. M. Chaikin, and E. Herbolzheimer, “Diffusing wave spectroscopy,” Phys. Rev. Lett. 60(12), 1134–1137 (1988).
[CrossRef] [PubMed]

1987

G. Maret and P. E. Wolf, “Multiple light-scattering from disordered media - the effect of brownian-motion of scatterers,” Z. Phys. B 65(4), 409–413 (1987).
[CrossRef]

Arger, P. H.

Baker, W. B.

T. Durduran, R. Choe, W. B. Baker, and A. G. Yodh, “Diffuse optics for tissue monitoring and tomography,” Rep. Prog. Phys. 73(7), 076701 (2010).
[CrossRef]

Barbieri, B.

D. Wallace, B. Michener, D. Choudhury, M. Levi, P. Fennelly, D. Hueber, and B. Barbieri, “Summary of the results of a 95 subject human clinical trial for the diagnosis of peripheral vascular disease using a near infrared frequency domain hemoglobin spectrometer,” Proc. SPIE 3597, 300–316 (1999).

Baron, J. C.

J. C. Baron, “Mapping the ischaemic penumbra with PET: implications for acute stroke treatment,” Cerebrovasc. Dis. 9(4), 193–201 (1999).
[CrossRef] [PubMed]

Bherer, L.

Binzoni, T.

M. Ferrari, T. Binzoni, and V. Quaresima, “Oxidative metabolism in muscle,” Philos. Trans. R. Soc. Lond. B Biol. Sci. 352(1354), 677–683 (1997).
[CrossRef] [PubMed]

Blasi, R. A.

R. A. Blasi, M. Cope, C. Elwell, F. Safoue, and M. Ferrari, “Noninvasive measurement of human forearm oxygen-consumption by near-infrared spectroscopy,” Eur. J. Appl. Physiol. 67(1), 20–25 (1993).
[CrossRef]

Boas, D. A.

G. Strangman, M. A. Franceschini, and D. A. Boas, “Factors affecting the accuracy of near-infrared spectroscopy concentration calculations for focal changes in oxygenation parameters,” Neuroimage 18(4), 865–879 (2003).
[CrossRef] [PubMed]

D. A. Boas and A. G. Yodh, “Spatially varying dynamical properties of turbid media probed with diffusing temporal light correlation,” J. Opt. Soc. Am. A 14(1), 192–215 (1997).
[CrossRef]

D. A. Boas, L. E. Campbell, and A. G. Yodh, “Scattering and imaging with diffusing temporal field correlations,” Phys. Rev. Lett. 75(9), 1855–1858 (1995).
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Borghuis, M. S.

M. C. P. van Beekvelt, M. S. Borghuis, B. G. M. van Engelen, R. A. Wevers, and W. N. J. M. Colier, “Adipose tissue thickness affects in vivo quantitative near-IR spectroscopy in human skeletal muscle,” Clin. Sci. 101(1), 21–28 (2001).
[CrossRef] [PubMed]

Buckley, E. M.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

E. M. Buckley, N. M. Cook, T. Durduran, M. N. Kim, C. Zhou, R. Choe, G. Yu, S. Schultz, C. M. Sehgal, D. J. Licht, P. H. Arger, M. E. Putt, H. H. Hurt, and A. G. Yodh, “Cerebral hemodynamics in preterm infants during positional intervention measured with diffuse correlation spectroscopy and transcranial Doppler ultrasound,” Opt. Express 17(15), 12571–12581 (2009).
[CrossRef] [PubMed]

Burnett, M. G.

Busch, T. M.

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, H. W. Wang, M. E. Putt, H. M. Saunders, C. M. Sehgal, E. Glatstein, A. G. Yodh, and T. M. Busch, “Noninvasive monitoring of murine tumor blood flow during and after photodynamic therapy provides early assessment of therapeutic efficacy,” Clin. Cancer Res. 11(9), 3543–3552 (2005).
[CrossRef] [PubMed]

Butler, J.

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
[CrossRef] [PubMed]

Campbell, L. E.

D. A. Boas, L. E. Campbell, and A. G. Yodh, “Scattering and imaging with diffusing temporal field correlations,” Phys. Rev. Lett. 75(9), 1855–1858 (1995).
[CrossRef] [PubMed]

Cerussi, A.

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
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D. J. Pine, D. A. Weitz, P. M. Chaikin, and E. Herbolzheimer, “Diffusing wave spectroscopy,” Phys. Rev. Lett. 60(12), 1134–1137 (1988).
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Chance, B.

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, G. Lech, C. Zhou, B. Chance, E. R. Mohler, and A. G. Yodh, “Time-dependent blood flow and oxygenation in human skeletal muscles measured with noninvasive near-infrared diffuse optical spectroscopies,” J. Biomed. Opt. 10(2), 024027 (2005).
[CrossRef] [PubMed]

Cheatle, T. R.

T. R. Cheatle, L. A. Potter, M. Cope, D. T. Delpy, P. D. C. Smith, and J. H. Scurr, “Near-infrared spectroscopy in peripheral vascular disease,” Br. J. Surg. 78(4), 405–408 (1991).
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Z. P. Chen, T. E. Milner, X. J. Wang, S. Srinivas, and J. S. Nelson, “Optical Doppler tomography: imaging in vivo blood flow dynamics following pharmacological intervention and photodynamic therapy,” Photochem. Photobiol. 67(1), 56–60 (1998).
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Cheng, R.

Cheung, C.

J. P. Culver, T. Durduran, D. Furuya, C. Cheung, J. H. Greenberg, and A. G. Yodh, “Diffuse optical tomography of cerebral blood flow, oxygenation, and metabolism in rat during focal ischemia,” J. Cereb. Blood Flow Metab. 23(8), 911–924 (2003).
[CrossRef] [PubMed]

C. Cheung, J. P. Culver, K. Takahashi, J. H. Greenberg, and A. G. Yodh, “In vivo cerebrovascular measurement combining diffuse near-infrared absorption and correlation spectroscopies,” Phys. Med. Biol. 46(8), 2053–2065 (2001).
[CrossRef] [PubMed]

Choe, R.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

T. Durduran, R. Choe, W. B. Baker, and A. G. Yodh, “Diffuse optics for tissue monitoring and tomography,” Rep. Prog. Phys. 73(7), 076701 (2010).
[CrossRef]

T. Durduran, C. Zhou, B. L. Edlow, G. Yu, R. Choe, M. N. Kim, B. L. Cucchiara, M. E. Putt, Q. Shah, S. E. Kasner, J. H. Greenberg, A. G. Yodh, and J. A. Detre, “Transcranial optical monitoring of cerebrovascular hemodynamics in acute stroke patients,” Opt. Express 17(5), 3884–3902 (2009).
[CrossRef] [PubMed]

E. M. Buckley, N. M. Cook, T. Durduran, M. N. Kim, C. Zhou, R. Choe, G. Yu, S. Schultz, C. M. Sehgal, D. J. Licht, P. H. Arger, M. E. Putt, H. H. Hurt, and A. G. Yodh, “Cerebral hemodynamics in preterm infants during positional intervention measured with diffuse correlation spectroscopy and transcranial Doppler ultrasound,” Opt. Express 17(15), 12571–12581 (2009).
[CrossRef] [PubMed]

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
[CrossRef] [PubMed]

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

T. Durduran, R. Choe, G. Yu, C. Zhou, J. C. Tchou, B. J. Czerniecki, and A. G. Yodh, “Diffuse optical measurement of blood flow in breast tumors,” Opt. Lett. 30(21), 2915–2917 (2005).
[CrossRef] [PubMed]

Choi, J. H.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
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U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
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D. Wallace, B. Michener, D. Choudhury, M. Levi, P. Fennelly, D. Hueber, and B. Barbieri, “Summary of the results of a 95 subject human clinical trial for the diagnosis of peripheral vascular disease using a near infrared frequency domain hemoglobin spectrometer,” Proc. SPIE 3597, 300–316 (1999).

Clemence, M.

A. Duncan, J. H. Meek, M. Clemence, C. E. Elwell, L. Tyszczuk, M. Cope, and D. T. Delpy, “Optical pathlength measurements on adult head, calf and forearm and the head of the newborn infant using phase resolved optical spectroscopy,” Phys. Med. Biol. 40(2), 295–304 (1995).
[CrossRef] [PubMed]

Colier, W. N. J. M.

M. C. P. van Beekvelt, M. S. Borghuis, B. G. M. van Engelen, R. A. Wevers, and W. N. J. M. Colier, “Adipose tissue thickness affects in vivo quantitative near-IR spectroscopy in human skeletal muscle,” Clin. Sci. 101(1), 21–28 (2001).
[CrossRef] [PubMed]

H. M. Kooijman, M. T. E. Hopman, W. N. J. M. Colier, J. A. van der Vliet, and B. Oeseburg, “Near infrared spectroscopy for noninvasive assessment of claudication,” J. Surg. Res. 72(1), 1–7 (1997).
[CrossRef] [PubMed]

Cook, N. M.

Cope, M.

A. Duncan, J. H. Meek, M. Clemence, C. E. Elwell, L. Tyszczuk, M. Cope, and D. T. Delpy, “Optical pathlength measurements on adult head, calf and forearm and the head of the newborn infant using phase resolved optical spectroscopy,” Phys. Med. Biol. 40(2), 295–304 (1995).
[CrossRef] [PubMed]

R. A. Blasi, M. Cope, C. Elwell, F. Safoue, and M. Ferrari, “Noninvasive measurement of human forearm oxygen-consumption by near-infrared spectroscopy,” Eur. J. Appl. Physiol. 67(1), 20–25 (1993).
[CrossRef]

T. R. Cheatle, L. A. Potter, M. Cope, D. T. Delpy, P. D. C. Smith, and J. H. Scurr, “Near-infrared spectroscopy in peripheral vascular disease,” Br. J. Surg. 78(4), 405–408 (1991).
[CrossRef] [PubMed]

Coussirat, D.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

Cucchiara, B. L.

Culver, J. P.

J. P. Culver, T. Durduran, D. Furuya, C. Cheung, J. H. Greenberg, and A. G. Yodh, “Diffuse optical tomography of cerebral blood flow, oxygenation, and metabolism in rat during focal ischemia,” J. Cereb. Blood Flow Metab. 23(8), 911–924 (2003).
[CrossRef] [PubMed]

C. Cheung, J. P. Culver, K. Takahashi, J. H. Greenberg, and A. G. Yodh, “In vivo cerebrovascular measurement combining diffuse near-infrared absorption and correlation spectroscopies,” Phys. Med. Biol. 46(8), 2053–2065 (2001).
[CrossRef] [PubMed]

Czerniecki, B. J.

Delpy, D. T.

A. Duncan, J. H. Meek, M. Clemence, C. E. Elwell, L. Tyszczuk, M. Cope, and D. T. Delpy, “Optical pathlength measurements on adult head, calf and forearm and the head of the newborn infant using phase resolved optical spectroscopy,” Phys. Med. Biol. 40(2), 295–304 (1995).
[CrossRef] [PubMed]

T. R. Cheatle, L. A. Potter, M. Cope, D. T. Delpy, P. D. C. Smith, and J. H. Scurr, “Near-infrared spectroscopy in peripheral vascular disease,” Br. J. Surg. 78(4), 405–408 (1991).
[CrossRef] [PubMed]

Desjardins, M.

Detre, J. A.

Dietsche, G.

Dong, L.

Du, J.

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

Duncan, A.

A. Duncan, J. H. Meek, M. Clemence, C. E. Elwell, L. Tyszczuk, M. Cope, and D. T. Delpy, “Optical pathlength measurements on adult head, calf and forearm and the head of the newborn infant using phase resolved optical spectroscopy,” Phys. Med. Biol. 40(2), 295–304 (1995).
[CrossRef] [PubMed]

Durduran, T.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

T. Durduran, R. Choe, W. B. Baker, and A. G. Yodh, “Diffuse optics for tissue monitoring and tomography,” Rep. Prog. Phys. 73(7), 076701 (2010).
[CrossRef]

T. Durduran, C. Zhou, B. L. Edlow, G. Yu, R. Choe, M. N. Kim, B. L. Cucchiara, M. E. Putt, Q. Shah, S. E. Kasner, J. H. Greenberg, A. G. Yodh, and J. A. Detre, “Transcranial optical monitoring of cerebrovascular hemodynamics in acute stroke patients,” Opt. Express 17(5), 3884–3902 (2009).
[CrossRef] [PubMed]

E. M. Buckley, N. M. Cook, T. Durduran, M. N. Kim, C. Zhou, R. Choe, G. Yu, S. Schultz, C. M. Sehgal, D. J. Licht, P. H. Arger, M. E. Putt, H. H. Hurt, and A. G. Yodh, “Cerebral hemodynamics in preterm infants during positional intervention measured with diffuse correlation spectroscopy and transcranial Doppler ultrasound,” Opt. Express 17(15), 12571–12581 (2009).
[CrossRef] [PubMed]

C. Zhou, S. A. Eucker, T. Durduran, G. Yu, J. Ralston, S. H. Friess, R. N. Ichord, S. S. Margulies, and A. G. Yodh, “Diffuse optical monitoring of hemodynamic changes in piglet brain with closed head injury,” J. Biomed. Opt. 14(3), 034015 (2009).
[CrossRef] [PubMed]

G. Yu, T. F. Floyd, T. Durduran, C. Zhou, J. J. Wang, J. A. Detre, and A. G. Yodh, “Validation of diffuse correlation spectroscopy for muscle blood flow with concurrent arterial spin labeled perfusion MRI,” Opt. Express 15(3), 1064–1075 (2007).
[CrossRef] [PubMed]

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
[CrossRef] [PubMed]

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, G. Lech, C. Zhou, B. Chance, E. R. Mohler, and A. G. Yodh, “Time-dependent blood flow and oxygenation in human skeletal muscles measured with noninvasive near-infrared diffuse optical spectroscopies,” J. Biomed. Opt. 10(2), 024027 (2005).
[CrossRef] [PubMed]

T. Durduran, R. Choe, G. Yu, C. Zhou, J. C. Tchou, B. J. Czerniecki, and A. G. Yodh, “Diffuse optical measurement of blood flow in breast tumors,” Opt. Lett. 30(21), 2915–2917 (2005).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, H. W. Wang, M. E. Putt, H. M. Saunders, C. M. Sehgal, E. Glatstein, A. G. Yodh, and T. M. Busch, “Noninvasive monitoring of murine tumor blood flow during and after photodynamic therapy provides early assessment of therapeutic efficacy,” Clin. Cancer Res. 11(9), 3543–3552 (2005).
[CrossRef] [PubMed]

T. Durduran, G. Yu, M. G. Burnett, J. A. Detre, J. H. Greenberg, J. J. Wang, C. Zhou, and A. G. Yodh, “Diffuse optical measurement of blood flow, blood oxygenation, and metabolism in a human brain during sensorimotor cortex activation,” Opt. Lett. 29(15), 1766–1768 (2004).
[CrossRef] [PubMed]

J. P. Culver, T. Durduran, D. Furuya, C. Cheung, J. H. Greenberg, and A. G. Yodh, “Diffuse optical tomography of cerebral blood flow, oxygenation, and metabolism in rat during focal ischemia,” J. Cereb. Blood Flow Metab. 23(8), 911–924 (2003).
[CrossRef] [PubMed]

Durkin, A.

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
[CrossRef] [PubMed]

Edlow, B. L.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

T. Durduran, C. Zhou, B. L. Edlow, G. Yu, R. Choe, M. N. Kim, B. L. Cucchiara, M. E. Putt, Q. Shah, S. E. Kasner, J. H. Greenberg, A. G. Yodh, and J. A. Detre, “Transcranial optical monitoring of cerebrovascular hemodynamics in acute stroke patients,” Opt. Express 17(5), 3884–3902 (2009).
[CrossRef] [PubMed]

Elbert, T.

Elwell, C.

R. A. Blasi, M. Cope, C. Elwell, F. Safoue, and M. Ferrari, “Noninvasive measurement of human forearm oxygen-consumption by near-infrared spectroscopy,” Eur. J. Appl. Physiol. 67(1), 20–25 (1993).
[CrossRef]

Elwell, C. E.

A. Duncan, J. H. Meek, M. Clemence, C. E. Elwell, L. Tyszczuk, M. Cope, and D. T. Delpy, “Optical pathlength measurements on adult head, calf and forearm and the head of the newborn infant using phase resolved optical spectroscopy,” Phys. Med. Biol. 40(2), 295–304 (1995).
[CrossRef] [PubMed]

Essenpreis, M.

Eucker, S. A.

C. Zhou, S. A. Eucker, T. Durduran, G. Yu, J. Ralston, S. H. Friess, R. N. Ichord, S. S. Margulies, and A. G. Yodh, “Diffuse optical monitoring of hemodynamic changes in piglet brain with closed head injury,” J. Biomed. Opt. 14(3), 034015 (2009).
[CrossRef] [PubMed]

Fagrell, B.

E. Wahlberg, P. Olofsson, J. Swedenborg, and B. Fagrell, “Level of arterial obstruction in patients with peripheral arterial occlusive disease (PAOD) determined by laser Doppler fluxmetry,” Eur. J. Vasc. Surg. 7(6), 684–689 (1993).
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Fantini, S.

S. Fantini, D. Hueber, M. A. Franceschini, E. Gratton, W. Rosenfeld, P. G. Stubblefield, D. Maulik, and M. R. Stankovic, “Non-invasive optical monitoring of the newborn piglet brain using continuous-wave and frequency-domain spectroscopy,” Phys. Med. Biol. 44(6), 1543–1563 (1999).
[CrossRef] [PubMed]

Farrell, T. J.

Fennelly, P.

D. Wallace, B. Michener, D. Choudhury, M. Levi, P. Fennelly, D. Hueber, and B. Barbieri, “Summary of the results of a 95 subject human clinical trial for the diagnosis of peripheral vascular disease using a near infrared frequency domain hemoglobin spectrometer,” Proc. SPIE 3597, 300–316 (1999).

Ferrari, M.

M. Ferrari, T. Binzoni, and V. Quaresima, “Oxidative metabolism in muscle,” Philos. Trans. R. Soc. Lond. B Biol. Sci. 352(1354), 677–683 (1997).
[CrossRef] [PubMed]

R. A. Blasi, M. Cope, C. Elwell, F. Safoue, and M. Ferrari, “Noninvasive measurement of human forearm oxygen-consumption by near-infrared spectroscopy,” Eur. J. Appl. Physiol. 67(1), 20–25 (1993).
[CrossRef]

Finlay, J. C.

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

Flentje, M.

P. Schmitt, M. Kotas, A. Tobermann, A. Haase, and M. Flentje, “Quantitative tissue perfusion measurements in head and neck carcinoma patients before and during radiation therapy with a non-invasive MR imaging spin-labeling technique,” Radiother. Oncol. 67(1), 27–34 (2003).
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Floyd, T. F.

Franceschini, M. A.

G. Strangman, M. A. Franceschini, and D. A. Boas, “Factors affecting the accuracy of near-infrared spectroscopy concentration calculations for focal changes in oxygenation parameters,” Neuroimage 18(4), 865–879 (2003).
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S. Fantini, D. Hueber, M. A. Franceschini, E. Gratton, W. Rosenfeld, P. G. Stubblefield, D. Maulik, and M. R. Stankovic, “Non-invasive optical monitoring of the newborn piglet brain using continuous-wave and frequency-domain spectroscopy,” Phys. Med. Biol. 44(6), 1543–1563 (1999).
[CrossRef] [PubMed]

Frangos, S.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

Friess, S. H.

C. Zhou, S. A. Eucker, T. Durduran, G. Yu, J. Ralston, S. H. Friess, R. N. Ichord, S. S. Margulies, and A. G. Yodh, “Diffuse optical monitoring of hemodynamic changes in piglet brain with closed head injury,” J. Biomed. Opt. 14(3), 034015 (2009).
[CrossRef] [PubMed]

Furuya, D.

J. P. Culver, T. Durduran, D. Furuya, C. Cheung, J. H. Greenberg, and A. G. Yodh, “Diffuse optical tomography of cerebral blood flow, oxygenation, and metabolism in rat during focal ischemia,” J. Cereb. Blood Flow Metab. 23(8), 911–924 (2003).
[CrossRef] [PubMed]

Gagnon, L.

Gisler, T.

Glanzmann, T.

A. Kienle and T. Glanzmann, “In vivo determination of the optical properties of muscle with time-resolved reflectance using a layered model,” Phys. Med. Biol. 44(11), 2689–2702 (1999).
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Glatstein, E.

G. Yu, T. Durduran, C. Zhou, H. W. Wang, M. E. Putt, H. M. Saunders, C. M. Sehgal, E. Glatstein, A. G. Yodh, and T. M. Busch, “Noninvasive monitoring of murine tumor blood flow during and after photodynamic therapy provides early assessment of therapeutic efficacy,” Clin. Cancer Res. 11(9), 3543–3552 (2005).
[CrossRef] [PubMed]

Grady, M. S.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

Gratton, E.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

S. Fantini, D. Hueber, M. A. Franceschini, E. Gratton, W. Rosenfeld, P. G. Stubblefield, D. Maulik, and M. R. Stankovic, “Non-invasive optical monitoring of the newborn piglet brain using continuous-wave and frequency-domain spectroscopy,” Phys. Med. Biol. 44(6), 1543–1563 (1999).
[CrossRef] [PubMed]

Greenberg, J. H.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

T. Durduran, C. Zhou, B. L. Edlow, G. Yu, R. Choe, M. N. Kim, B. L. Cucchiara, M. E. Putt, Q. Shah, S. E. Kasner, J. H. Greenberg, A. G. Yodh, and J. A. Detre, “Transcranial optical monitoring of cerebrovascular hemodynamics in acute stroke patients,” Opt. Express 17(5), 3884–3902 (2009).
[CrossRef] [PubMed]

T. Durduran, G. Yu, M. G. Burnett, J. A. Detre, J. H. Greenberg, J. J. Wang, C. Zhou, and A. G. Yodh, “Diffuse optical measurement of blood flow, blood oxygenation, and metabolism in a human brain during sensorimotor cortex activation,” Opt. Lett. 29(15), 1766–1768 (2004).
[CrossRef] [PubMed]

J. P. Culver, T. Durduran, D. Furuya, C. Cheung, J. H. Greenberg, and A. G. Yodh, “Diffuse optical tomography of cerebral blood flow, oxygenation, and metabolism in rat during focal ischemia,” J. Cereb. Blood Flow Metab. 23(8), 911–924 (2003).
[CrossRef] [PubMed]

C. Cheung, J. P. Culver, K. Takahashi, J. H. Greenberg, and A. G. Yodh, “In vivo cerebrovascular measurement combining diffuse near-infrared absorption and correlation spectroscopies,” Phys. Med. Biol. 46(8), 2053–2065 (2001).
[CrossRef] [PubMed]

Haase, A.

P. Schmitt, M. Kotas, A. Tobermann, A. Haase, and M. Flentje, “Quantitative tissue perfusion measurements in head and neck carcinoma patients before and during radiation therapy with a non-invasive MR imaging spin-labeling technique,” Radiother. Oncol. 67(1), 27–34 (2003).
[CrossRef] [PubMed]

Hahn, S. M.

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

Halber, C.

K. K. McCully, C. Halber, and J. D. Posner, “Exercise-induced changes in oxygen saturation in the calf muscles of elderly subjects with peripheral vascular disease,” J. Gerontol. 49(3), B128–B134 (1994).
[PubMed]

Herbolzheimer, E.

D. J. Pine, D. A. Weitz, P. M. Chaikin, and E. Herbolzheimer, “Diffusing wave spectroscopy,” Phys. Rev. Lett. 60(12), 1134–1137 (1988).
[CrossRef] [PubMed]

Hopman, M. T. E.

H. M. Kooijman, M. T. E. Hopman, W. N. J. M. Colier, J. A. van der Vliet, and B. Oeseburg, “Near infrared spectroscopy for noninvasive assessment of claudication,” J. Surg. Res. 72(1), 1–7 (1997).
[CrossRef] [PubMed]

Hsiang, D.

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
[CrossRef] [PubMed]

Hueber, D.

D. Wallace, B. Michener, D. Choudhury, M. Levi, P. Fennelly, D. Hueber, and B. Barbieri, “Summary of the results of a 95 subject human clinical trial for the diagnosis of peripheral vascular disease using a near infrared frequency domain hemoglobin spectrometer,” Proc. SPIE 3597, 300–316 (1999).

S. Fantini, D. Hueber, M. A. Franceschini, E. Gratton, W. Rosenfeld, P. G. Stubblefield, D. Maulik, and M. R. Stankovic, “Non-invasive optical monitoring of the newborn piglet brain using continuous-wave and frequency-domain spectroscopy,” Phys. Med. Biol. 44(6), 1543–1563 (1999).
[CrossRef] [PubMed]

Hull, S.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

Hurt, H. H.

Ichord, R. N.

C. Zhou, S. A. Eucker, T. Durduran, G. Yu, J. Ralston, S. H. Friess, R. N. Ichord, S. S. Margulies, and A. G. Yodh, “Diffuse optical monitoring of hemodynamic changes in piglet brain with closed head injury,” J. Biomed. Opt. 14(3), 034015 (2009).
[CrossRef] [PubMed]

Irwin, D.

Ishibashi, H.

T. Yamada, T. Ohta, H. Ishibashi, I. Sugimoto, H. Iwata, M. Takahashi, and J. Kawanishi, “Clinical reliability and utility of skin perfusion pressure measurement in ischemic limbs--comparison with other noninvasive diagnostic methods,” J. Vasc. Surg. 47(2), 318–323 (2008).
[CrossRef] [PubMed]

Iwata, H.

T. Yamada, T. Ohta, H. Ishibashi, I. Sugimoto, H. Iwata, M. Takahashi, and J. Kawanishi, “Clinical reliability and utility of skin perfusion pressure measurement in ischemic limbs--comparison with other noninvasive diagnostic methods,” J. Vasc. Surg. 47(2), 318–323 (2008).
[CrossRef] [PubMed]

Jacobs, M. J.

D. T. Ubbink, P. J. Kitslaar, J. H. Tordoir, R. S. Reneman, and M. J. Jacobs, “Skin microcirculation in diabetic and non-diabetic patients at different stages of lower limb ischaemia,” Eur. J. Vasc. Surg. 7(6), 659–6 (1993).
[CrossRef] [PubMed]

Jaillon, F.

Jehanne-Lacasse, J.

Kasner, S. E.

Kawanishi, J.

T. Yamada, T. Ohta, H. Ishibashi, I. Sugimoto, H. Iwata, M. Takahashi, and J. Kawanishi, “Clinical reliability and utility of skin perfusion pressure measurement in ischemic limbs--comparison with other noninvasive diagnostic methods,” J. Vasc. Surg. 47(2), 318–323 (2008).
[CrossRef] [PubMed]

Kienle, A.

A. Kienle and T. Glanzmann, “In vivo determination of the optical properties of muscle with time-resolved reflectance using a layered model,” Phys. Med. Biol. 44(11), 2689–2702 (1999).
[CrossRef] [PubMed]

Kilger, A.

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

Kim, J. G.

Y. L. Song, J. G. Kim, R. P. Mason, and H. L. Liu, “Investigation of rat breast tumour oxygen consumption by near-infrared spectroscopy,” J. Phys. D Appl. Phys. 38(15), 2682–2690 (2005).
[CrossRef]

Kim, M. N.

Kissler, J.

Kitslaar, P. J.

D. T. Ubbink, P. J. Kitslaar, J. H. Tordoir, R. S. Reneman, and M. J. Jacobs, “Skin microcirculation in diabetic and non-diabetic patients at different stages of lower limb ischaemia,” Eur. J. Vasc. Surg. 7(6), 659–6 (1993).
[CrossRef] [PubMed]

Koban, L.

Kofke, W. A.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

Kooijman, H. M.

H. M. Kooijman, M. T. E. Hopman, W. N. J. M. Colier, J. A. van der Vliet, and B. Oeseburg, “Near infrared spectroscopy for noninvasive assessment of claudication,” J. Surg. Res. 72(1), 1–7 (1997).
[CrossRef] [PubMed]

Kotas, M.

P. Schmitt, M. Kotas, A. Tobermann, A. Haase, and M. Flentje, “Quantitative tissue perfusion measurements in head and neck carcinoma patients before and during radiation therapy with a non-invasive MR imaging spin-labeling technique,” Radiother. Oncol. 67(1), 27–34 (2003).
[CrossRef] [PubMed]

Lech, G.

G. Yu, T. Durduran, G. Lech, C. Zhou, B. Chance, E. R. Mohler, and A. G. Yodh, “Time-dependent blood flow and oxygenation in human skeletal muscles measured with noninvasive near-infrared diffuse optical spectroscopies,” J. Biomed. Opt. 10(2), 024027 (2005).
[CrossRef] [PubMed]

Lesage, F.

Levi, M.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

D. Wallace, B. Michener, D. Choudhury, M. Levi, P. Fennelly, D. Hueber, and B. Barbieri, “Summary of the results of a 95 subject human clinical trial for the diagnosis of peripheral vascular disease using a near infrared frequency domain hemoglobin spectrometer,” Proc. SPIE 3597, 300–316 (1999).

Levine, J. M.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

Li, J.

Licht, D. J.

Liu, H. L.

Y. L. Song, J. G. Kim, R. P. Mason, and H. L. Liu, “Investigation of rat breast tumour oxygen consumption by near-infrared spectroscopy,” J. Phys. D Appl. Phys. 38(15), 2682–2690 (2005).
[CrossRef]

Loevner, L.

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

Lustig, R.

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

Malkowicz, S. B.

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

Maloney-Wilensky, E.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

Mantulin, W. W.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
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G. Maret and P. E. Wolf, “Multiple light-scattering from disordered media - the effect of brownian-motion of scatterers,” Z. Phys. B 65(4), 409–413 (1987).
[CrossRef]

Margulies, S. S.

C. Zhou, S. A. Eucker, T. Durduran, G. Yu, J. Ralston, S. H. Friess, R. N. Ichord, S. S. Margulies, and A. G. Yodh, “Diffuse optical monitoring of hemodynamic changes in piglet brain with closed head injury,” J. Biomed. Opt. 14(3), 034015 (2009).
[CrossRef] [PubMed]

Mason, R. P.

Y. L. Song, J. G. Kim, R. P. Mason, and H. L. Liu, “Investigation of rat breast tumour oxygen consumption by near-infrared spectroscopy,” J. Phys. D Appl. Phys. 38(15), 2682–2690 (2005).
[CrossRef]

Maulik, D.

S. Fantini, D. Hueber, M. A. Franceschini, E. Gratton, W. Rosenfeld, P. G. Stubblefield, D. Maulik, and M. R. Stankovic, “Non-invasive optical monitoring of the newborn piglet brain using continuous-wave and frequency-domain spectroscopy,” Phys. Med. Biol. 44(6), 1543–1563 (1999).
[CrossRef] [PubMed]

McCully, K. K.

K. K. McCully, C. Halber, and J. D. Posner, “Exercise-induced changes in oxygen saturation in the calf muscles of elderly subjects with peripheral vascular disease,” J. Gerontol. 49(3), B128–B134 (1994).
[PubMed]

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A. Duncan, J. H. Meek, M. Clemence, C. E. Elwell, L. Tyszczuk, M. Cope, and D. T. Delpy, “Optical pathlength measurements on adult head, calf and forearm and the head of the newborn infant using phase resolved optical spectroscopy,” Phys. Med. Biol. 40(2), 295–304 (1995).
[CrossRef] [PubMed]

Mehta, R.

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
[CrossRef] [PubMed]

Michalos, A.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

Michener, B.

D. Wallace, B. Michener, D. Choudhury, M. Levi, P. Fennelly, D. Hueber, and B. Barbieri, “Summary of the results of a 95 subject human clinical trial for the diagnosis of peripheral vascular disease using a near infrared frequency domain hemoglobin spectrometer,” Proc. SPIE 3597, 300–316 (1999).

Milner, T. E.

Z. P. Chen, T. E. Milner, X. J. Wang, S. Srinivas, and J. S. Nelson, “Optical Doppler tomography: imaging in vivo blood flow dynamics following pharmacological intervention and photodynamic therapy,” Photochem. Photobiol. 67(1), 56–60 (1998).
[CrossRef] [PubMed]

Mohler, E. R.

G. Yu, T. Durduran, G. Lech, C. Zhou, B. Chance, E. R. Mohler, and A. G. Yodh, “Time-dependent blood flow and oxygenation in human skeletal muscles measured with noninvasive near-infrared diffuse optical spectroscopies,” J. Biomed. Opt. 10(2), 024027 (2005).
[CrossRef] [PubMed]

Moss, H. E.

M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

Nelson, J. S.

Z. P. Chen, T. E. Milner, X. J. Wang, S. Srinivas, and J. S. Nelson, “Optical Doppler tomography: imaging in vivo blood flow dynamics following pharmacological intervention and photodynamic therapy,” Photochem. Photobiol. 67(1), 56–60 (1998).
[CrossRef] [PubMed]

Ninck, M.

Nioka, S.

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

Oeseburg, B.

H. M. Kooijman, M. T. E. Hopman, W. N. J. M. Colier, J. A. van der Vliet, and B. Oeseburg, “Near infrared spectroscopy for noninvasive assessment of claudication,” J. Surg. Res. 72(1), 1–7 (1997).
[CrossRef] [PubMed]

Ohta, T.

T. Yamada, T. Ohta, H. Ishibashi, I. Sugimoto, H. Iwata, M. Takahashi, and J. Kawanishi, “Clinical reliability and utility of skin perfusion pressure measurement in ischemic limbs--comparison with other noninvasive diagnostic methods,” J. Vasc. Surg. 47(2), 318–323 (2008).
[CrossRef] [PubMed]

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E. Wahlberg, P. Olofsson, J. Swedenborg, and B. Fagrell, “Level of arterial obstruction in patients with peripheral arterial occlusive disease (PAOD) determined by laser Doppler fluxmetry,” Eur. J. Vasc. Surg. 7(6), 684–689 (1993).
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Ortolf, C.

Patterson, M. S.

Paunescu, L. A.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

Pine, D. J.

D. J. Pine, D. A. Weitz, P. M. Chaikin, and E. Herbolzheimer, “Diffusing wave spectroscopy,” Phys. Rev. Lett. 60(12), 1134–1137 (1988).
[CrossRef] [PubMed]

Posner, J. D.

K. K. McCully, C. Halber, and J. D. Posner, “Exercise-induced changes in oxygen saturation in the calf muscles of elderly subjects with peripheral vascular disease,” J. Gerontol. 49(3), B128–B134 (1994).
[PubMed]

Potter, L. A.

T. R. Cheatle, L. A. Potter, M. Cope, D. T. Delpy, P. D. C. Smith, and J. H. Scurr, “Near-infrared spectroscopy in peripheral vascular disease,” Br. J. Surg. 78(4), 405–408 (1991).
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Putt, M. E.

Quaresima, V.

M. Ferrari, T. Binzoni, and V. Quaresima, “Oxidative metabolism in muscle,” Philos. Trans. R. Soc. Lond. B Biol. Sci. 352(1354), 677–683 (1997).
[CrossRef] [PubMed]

Quon, H.

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

Ralston, J.

C. Zhou, S. A. Eucker, T. Durduran, G. Yu, J. Ralston, S. H. Friess, R. N. Ichord, S. S. Margulies, and A. G. Yodh, “Diffuse optical monitoring of hemodynamic changes in piglet brain with closed head injury,” J. Biomed. Opt. 14(3), 034015 (2009).
[CrossRef] [PubMed]

Reneman, R. S.

D. T. Ubbink, P. J. Kitslaar, J. H. Tordoir, R. S. Reneman, and M. J. Jacobs, “Skin microcirculation in diabetic and non-diabetic patients at different stages of lower limb ischaemia,” Eur. J. Vasc. Surg. 7(6), 659–6 (1993).
[CrossRef] [PubMed]

Rosenfeld, W.

S. Fantini, D. Hueber, M. A. Franceschini, E. Gratton, W. Rosenfeld, P. G. Stubblefield, D. Maulik, and M. R. Stankovic, “Non-invasive optical monitoring of the newborn piglet brain using continuous-wave and frequency-domain spectroscopy,” Phys. Med. Biol. 44(6), 1543–1563 (1999).
[CrossRef] [PubMed]

Safonova, L. P.

U. Wolf, M. Wolf, J. H. Choi, M. Levi, D. Choudhury, S. Hull, D. Coussirat, L. A. Paunescu, L. P. Safonova, A. Michalos, W. W. Mantulin, and E. Gratton, “Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry,” J. Vasc. Surg. 37(5), 1017–1026 (2003).
[CrossRef] [PubMed]

Safoue, F.

R. A. Blasi, M. Cope, C. Elwell, F. Safoue, and M. Ferrari, “Noninvasive measurement of human forearm oxygen-consumption by near-infrared spectroscopy,” Eur. J. Appl. Physiol. 67(1), 20–25 (1993).
[CrossRef]

Saunders, H. M.

G. Yu, T. Durduran, C. Zhou, H. W. Wang, M. E. Putt, H. M. Saunders, C. M. Sehgal, E. Glatstein, A. G. Yodh, and T. M. Busch, “Noninvasive monitoring of murine tumor blood flow during and after photodynamic therapy provides early assessment of therapeutic efficacy,” Clin. Cancer Res. 11(9), 3543–3552 (2005).
[CrossRef] [PubMed]

Schmitt, P.

P. Schmitt, M. Kotas, A. Tobermann, A. Haase, and M. Flentje, “Quantitative tissue perfusion measurements in head and neck carcinoma patients before and during radiation therapy with a non-invasive MR imaging spin-labeling technique,” Radiother. Oncol. 67(1), 27–34 (2003).
[CrossRef] [PubMed]

Schultz, S.

Scurr, J. H.

T. R. Cheatle, L. A. Potter, M. Cope, D. T. Delpy, P. D. C. Smith, and J. H. Scurr, “Near-infrared spectroscopy in peripheral vascular disease,” Br. J. Surg. 78(4), 405–408 (1991).
[CrossRef] [PubMed]

Sehgal, C. M.

E. M. Buckley, N. M. Cook, T. Durduran, M. N. Kim, C. Zhou, R. Choe, G. Yu, S. Schultz, C. M. Sehgal, D. J. Licht, P. H. Arger, M. E. Putt, H. H. Hurt, and A. G. Yodh, “Cerebral hemodynamics in preterm infants during positional intervention measured with diffuse correlation spectroscopy and transcranial Doppler ultrasound,” Opt. Express 17(15), 12571–12581 (2009).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, H. W. Wang, M. E. Putt, H. M. Saunders, C. M. Sehgal, E. Glatstein, A. G. Yodh, and T. M. Busch, “Noninvasive monitoring of murine tumor blood flow during and after photodynamic therapy provides early assessment of therapeutic efficacy,” Clin. Cancer Res. 11(9), 3543–3552 (2005).
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U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, G. Lech, C. Zhou, B. Chance, E. R. Mohler, and A. G. Yodh, “Time-dependent blood flow and oxygenation in human skeletal muscles measured with noninvasive near-infrared diffuse optical spectroscopies,” J. Biomed. Opt. 10(2), 024027 (2005).
[CrossRef] [PubMed]

T. Durduran, R. Choe, G. Yu, C. Zhou, J. C. Tchou, B. J. Czerniecki, and A. G. Yodh, “Diffuse optical measurement of blood flow in breast tumors,” Opt. Lett. 30(21), 2915–2917 (2005).
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[CrossRef] [PubMed]

Zhao, Y.

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M. N. Kim, T. Durduran, S. Frangos, B. L. Edlow, E. M. Buckley, H. E. Moss, C. Zhou, G. Yu, R. Choe, E. Maloney-Wilensky, R. L. Wolf, M. S. Grady, J. H. Greenberg, J. M. Levine, A. G. Yodh, J. A. Detre, and W. A. Kofke, “Noninvasive measurement of cerebral blood flow and blood oxygenation using near-infrared and diffuse correlation spectroscopies in critically brain-injured adults,” Neurocrit. Care 12(2), 173–180 (2010).
[CrossRef] [PubMed]

T. Durduran, C. Zhou, B. L. Edlow, G. Yu, R. Choe, M. N. Kim, B. L. Cucchiara, M. E. Putt, Q. Shah, S. E. Kasner, J. H. Greenberg, A. G. Yodh, and J. A. Detre, “Transcranial optical monitoring of cerebrovascular hemodynamics in acute stroke patients,” Opt. Express 17(5), 3884–3902 (2009).
[CrossRef] [PubMed]

E. M. Buckley, N. M. Cook, T. Durduran, M. N. Kim, C. Zhou, R. Choe, G. Yu, S. Schultz, C. M. Sehgal, D. J. Licht, P. H. Arger, M. E. Putt, H. H. Hurt, and A. G. Yodh, “Cerebral hemodynamics in preterm infants during positional intervention measured with diffuse correlation spectroscopy and transcranial Doppler ultrasound,” Opt. Express 17(15), 12571–12581 (2009).
[CrossRef] [PubMed]

C. Zhou, S. A. Eucker, T. Durduran, G. Yu, J. Ralston, S. H. Friess, R. N. Ichord, S. S. Margulies, and A. G. Yodh, “Diffuse optical monitoring of hemodynamic changes in piglet brain with closed head injury,” J. Biomed. Opt. 14(3), 034015 (2009).
[CrossRef] [PubMed]

C. Zhou, R. Choe, N. Shah, T. Durduran, G. Yu, A. Durkin, D. Hsiang, R. Mehta, J. Butler, A. Cerussi, B. J. Tromberg, and A. G. Yodh, “Diffuse optical monitoring of blood flow and oxygenation in human breast cancer during early stages of neoadjuvant chemotherapy,” J. Biomed. Opt. 12(5), 051903 (2007).
[CrossRef] [PubMed]

G. Yu, T. F. Floyd, T. Durduran, C. Zhou, J. J. Wang, J. A. Detre, and A. G. Yodh, “Validation of diffuse correlation spectroscopy for muscle blood flow with concurrent arterial spin labeled perfusion MRI,” Opt. Express 15(3), 1064–1075 (2007).
[CrossRef] [PubMed]

U. Sunar, H. Quon, T. Durduran, J. Zhang, J. Du, C. Zhou, G. Yu, R. Choe, A. Kilger, R. Lustig, L. Loevner, S. Nioka, B. Chance, and A. G. Yodh, “Noninvasive diffuse optical measurement of blood flow and blood oxygenation for monitoring radiation therapy in patients with head and neck tumors: a pilot study,” J. Biomed. Opt. 11(6), 064021 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
[CrossRef] [PubMed]

G. Yu, T. Durduran, G. Lech, C. Zhou, B. Chance, E. R. Mohler, and A. G. Yodh, “Time-dependent blood flow and oxygenation in human skeletal muscles measured with noninvasive near-infrared diffuse optical spectroscopies,” J. Biomed. Opt. 10(2), 024027 (2005).
[CrossRef] [PubMed]

T. Durduran, R. Choe, G. Yu, C. Zhou, J. C. Tchou, B. J. Czerniecki, and A. G. Yodh, “Diffuse optical measurement of blood flow in breast tumors,” Opt. Lett. 30(21), 2915–2917 (2005).
[CrossRef] [PubMed]

G. Yu, T. Durduran, C. Zhou, H. W. Wang, M. E. Putt, H. M. Saunders, C. M. Sehgal, E. Glatstein, A. G. Yodh, and T. M. Busch, “Noninvasive monitoring of murine tumor blood flow during and after photodynamic therapy provides early assessment of therapeutic efficacy,” Clin. Cancer Res. 11(9), 3543–3552 (2005).
[CrossRef] [PubMed]

T. Durduran, G. Yu, M. G. Burnett, J. A. Detre, J. H. Greenberg, J. J. Wang, C. Zhou, and A. G. Yodh, “Diffuse optical measurement of blood flow, blood oxygenation, and metabolism in a human brain during sensorimotor cortex activation,” Opt. Lett. 29(15), 1766–1768 (2004).
[CrossRef] [PubMed]

Zhu, T. C.

G. Yu, T. Durduran, C. Zhou, T. C. Zhu, J. C. Finlay, T. M. Busch, S. B. Malkowicz, S. M. Hahn, and A. G. Yodh, “Real-time in situ monitoring of human prostate photodynamic therapy with diffuse light,” Photochem. Photobiol. 82(5), 1279–1284 (2006).
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Figures (6)

Fig. 1
Fig. 1

(a) Toe up/down plantar flexion (PF) exercise on the ground. (b) Isotonic and isometric PFs on a dynamometer. (c) The foot position changes (90° ←→ 120°) during isotonic PF. (d) 4-channel DCS device.

Fig. 2
Fig. 2

Time course of the DCS signals (αDB) during 15 toe up/down plantar flexion (PF) exercise. The vertical lines indicate beginning and end of each PF period. DCS data were normalized to the averaged 2-minute baseline before exercise. The baseline value was assigned 100%. The exercise creates both muscle fiber motion and blood flow changes, which in turn result in significant increases in DCS signal decay rates. No objective way exists to separate the blood flow contributions to the DCS signal from the motion artifacts contributions using this protocol.

Fig. 3
Fig. 3

(a) Dynamometer recordings (plantar flexion torque, footplate position and angular velocity) and DCS signals (αDB) during 10 isotonic exercises. Data are presented with different colors and symbols based on the exercise status of muscle fibers; i.e., no-exercise (pre- and post-exercises without muscle fiber motion, ■), non-contracting (muscle relaxation at 90° without fiber motion, ▼), PF-120° (muscle contraction at an angle of 120° without fiber motion, ◇), PF (footplate moving forward with muscle fiber motions,★) and DF (footplate moving backward with muscle fiber motions, ●). The muscle exercise status was determined by the footplate position and angular velocity. Note that several motion-induced spikes appeared in DCS measurements before and after exercise when the angle of footplate was adjusted (i.e., 90° → 120° or 120° → 90°) for setting up the dynamometer. Those artifacts were excluded from our data analysis. (b) Average increases [mean ± standard error, n = 10 (trials)] in DCS data (αDB) during muscle fiber motion (PF or DF) and during static status of muscles (PF-120° or non-contracting). The muscle fiber motion (i.e., PF and DF) created higher αDB than that without motion (i.e., PF-120° and Non-contracting), and muscle fiber contraction (PF-120°) caused an increase in blood flow compared to that without the muscle contracting.

Fig. 4
Fig. 4

Dynamometer recordings (plantar flexion torque, footplate position and angular velocity) and DCS signals (αDB) during 10 isometric exercises. Data are presented with different colors and symbols based on the exercise status of muscle fibers; i.e., no exercise (pre- and post- exercise without muscle fiber motion, ■), non-contracting (muscle relaxation at 90° without fiber motion, ▼), and PF-90° (muscle contraction at 90° without fiber motion, ●). The muscle exercise statues are determined by the plantar flexion torque. Note that several motion-induced spikes appeared in DCS measurements before and after exercise when the angle of footplate was adjusted for setting up the dynamometer. Those artifacts were excluded from our data analysis. Similar to the isotonic exercise, the muscle fiber contraction (PF-90°) caused an increase in blood flow compared to that without the muscle contracting. The average results of DCS data (αDB) during exercise are presented in Fig. 5.

Fig. 5
Fig. 5

Comparison of average DCS signals (αDB) [mean ± SE, n = 10 (trials)] during isotonic and isometric exercises. Here the “Contracting” data during isotonic/isometric exercise represents the PF-120°/PF-90°, and “Non-contracting” represents the muscle in a relaxed status for both exercises. DCS data presented here are not influenced by any known motion artifacts, and therefore these signals are believed to originate from the muscle blood flow. Without motion artifacts the isotonic exercise produced similar level DCS flow signals compared to the isometric exercise, when the exercise intensity was set up at the same level (30% of highest MVIC) and the muscle worked in the same way (contracting or non-contracting).

Fig. 6
Fig. 6

Comparison of during- and post- exercise DCS (αDB) responses in medial gastrocnemius muscle. The mean and standard deviation (SD) of DCS flow data (αDB) during 10 isotonic exercise [n = 75 (data points)] and isometric exercise [n = 68 (data points)] when muscle was under relaxation status (no motion and non-contracting) were calculated respectively, and presented as during-exercise blood flow responses. The 1s-post blood flow data was calculated by averaging the 1st~3rd-sec DCS data [n = 5 (data points)] immediately after the end of last (10th) PF. The 10s-post blood flow data was calculated by averaging the 2-minute DCS data [n = 264 (data points)] started at 10-second after the end of last PF. A small flow decrease immediately after the exercise (1s-post) was observed compared to during exercise, followed by a rapid and substantial drop at 10-second (10s-post) after isotonic/isometric exercise.

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