M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

S. Ashkenazi, “Photoacoustic lifetime imaging of dissolved oxygen using methylene blue,” J. Biomed. Opt. 15(4), 040501 (2010).

[Crossref]
[PubMed]

J. Su, A. Karpiouk, B. Wang, and S. Emelianov, “Photoacoustic imaging of clinical metal needles in tissue,” J. Biomed. Opt. 15(2), 021309 (2010).

[Crossref]
[PubMed]

P. Ephrat, L. Keenliside, A. Seabrook, F. S. Prato, and J. J. L. Carson, “Three-dimensional photoacoustic imaging by sparse-array detection and iterative image reconstruction,” J. Biomed. Opt. 13(5), 054052 (2008).

[Crossref]
[PubMed]

P. Ephrat, M. Roumeliotis, F. S. Prato, and J. J. Carson, “Four-dimensional photoacoustic imaging of moving targets,” Opt. Express 16(26), 21570–21581 (2008).

[Crossref]
[PubMed]

M. H. Xu and L. V. Wang, “Universal back-projection algorithm for photoacoustic computed tomography,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys. 71(1), 016706 (2005).

[Crossref]
[PubMed]

G. Paltauf, J. A. Viator, S. A. Prahl, and S. L. Jacques, “Iterative reconstruction algorithm for optoacoustic imaging,” J. Acoust. Soc. Am. 112(4), 1536–1544 (2002).

[Crossref]
[PubMed]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

D. Frauchiger, K. P. Kostli, G. Paltauf, M. Frenz, and H. P. Weber, “Optoacoustic tomography using a two dimensional optical pressure transducer and two different reconstruction algorithms,” Proc. SPIE 4434, 74–80 (2001).

[Crossref]

R. A. Kruger, D. R. Reinecke, and G. A. Kruger, “Thermoacoustic computed tomography—technical considerations,” Med. Phys. 26(9), 1832–1837 (1999).

[Crossref]
[PubMed]

A. A. Oraevsky, V. G. Andreev, A. A. Karabutov, and R. O. Esenaliev, “Two-dimensional opto-acoustic tomography transducer array and image reconstruction algorithm,” Proc. SPIE 3601, 256–267 (1999).

[Crossref]

D. J. Kadrmas, E. C. Frey, and B. M. W. Tsui, “An SVD investigation of modeling scatter in multiple energy windows for improved SPECT images,” IEEE Trans. Nucl. Sci. 43(4), 2275–2284 (1996).

[Crossref]
[PubMed]

K. Konstantinides, “Threshold bounds in SVD and a new iterative algorithm for order selection in Ar models,” IEEE Trans. Signal Process. 39(5), 1218–1221 (1991).

[Crossref]

G. J. Diebold, T. Sun, and M. I. Khan, “Photoacoustic monopole radiation in one, two, and three dimensions,” Phys. Rev. Lett. 67(24), 3384–3387 (1991).

[Crossref]
[PubMed]

K. Konstantinides and K. Yao, “Statistical analysis of effective singular values in matrix rank determination,” IEEE Trans. Acoust. Speech Signal Process. 36(5), 757–763 (1988).

[Crossref]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

A. A. Oraevsky, V. G. Andreev, A. A. Karabutov, and R. O. Esenaliev, “Two-dimensional opto-acoustic tomography transducer array and image reconstruction algorithm,” Proc. SPIE 3601, 256–267 (1999).

[Crossref]

S. Ashkenazi, “Photoacoustic lifetime imaging of dissolved oxygen using methylene blue,” J. Biomed. Opt. 15(4), 040501 (2010).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

M. Roumeliotis, P. Ephrat, J. Patrick, and J. J. L. Carson, “Development and characterization of an omnidirectional photoacoustic point source for calibration of a staring 3D photoacoustic imaging system,” Opt. Express 17(17), 15228–15238 (2009).

[Crossref]
[PubMed]

P. Ephrat, L. Keenliside, A. Seabrook, F. S. Prato, and J. J. L. Carson, “Three-dimensional photoacoustic imaging by sparse-array detection and iterative image reconstruction,” J. Biomed. Opt. 13(5), 054052 (2008).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

G. J. Diebold, T. Sun, and M. I. Khan, “Photoacoustic monopole radiation in one, two, and three dimensions,” Phys. Rev. Lett. 67(24), 3384–3387 (1991).

[Crossref]
[PubMed]

J. Su, A. Karpiouk, B. Wang, and S. Emelianov, “Photoacoustic imaging of clinical metal needles in tissue,” J. Biomed. Opt. 15(2), 021309 (2010).

[Crossref]
[PubMed]

M. Roumeliotis, P. Ephrat, J. Patrick, and J. J. L. Carson, “Development and characterization of an omnidirectional photoacoustic point source for calibration of a staring 3D photoacoustic imaging system,” Opt. Express 17(17), 15228–15238 (2009).

[Crossref]
[PubMed]

P. Ephrat, M. Roumeliotis, F. S. Prato, and J. J. Carson, “Four-dimensional photoacoustic imaging of moving targets,” Opt. Express 16(26), 21570–21581 (2008).

[Crossref]
[PubMed]

P. Ephrat, L. Keenliside, A. Seabrook, F. S. Prato, and J. J. L. Carson, “Three-dimensional photoacoustic imaging by sparse-array detection and iterative image reconstruction,” J. Biomed. Opt. 13(5), 054052 (2008).

[Crossref]
[PubMed]

A. A. Oraevsky, V. G. Andreev, A. A. Karabutov, and R. O. Esenaliev, “Two-dimensional opto-acoustic tomography transducer array and image reconstruction algorithm,” Proc. SPIE 3601, 256–267 (1999).

[Crossref]

D. Frauchiger, K. P. Kostli, G. Paltauf, M. Frenz, and H. P. Weber, “Optoacoustic tomography using a two dimensional optical pressure transducer and two different reconstruction algorithms,” Proc. SPIE 4434, 74–80 (2001).

[Crossref]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

D. Frauchiger, K. P. Kostli, G. Paltauf, M. Frenz, and H. P. Weber, “Optoacoustic tomography using a two dimensional optical pressure transducer and two different reconstruction algorithms,” Proc. SPIE 4434, 74–80 (2001).

[Crossref]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

D. J. Kadrmas, E. C. Frey, and B. M. W. Tsui, “An SVD investigation of modeling scatter in multiple energy windows for improved SPECT images,” IEEE Trans. Nucl. Sci. 43(4), 2275–2284 (1996).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

G. Paltauf, J. A. Viator, S. A. Prahl, and S. L. Jacques, “Iterative reconstruction algorithm for optoacoustic imaging,” J. Acoust. Soc. Am. 112(4), 1536–1544 (2002).

[Crossref]
[PubMed]

D. J. Kadrmas, E. C. Frey, and B. M. W. Tsui, “An SVD investigation of modeling scatter in multiple energy windows for improved SPECT images,” IEEE Trans. Nucl. Sci. 43(4), 2275–2284 (1996).

[Crossref]
[PubMed]

A. A. Oraevsky, V. G. Andreev, A. A. Karabutov, and R. O. Esenaliev, “Two-dimensional opto-acoustic tomography transducer array and image reconstruction algorithm,” Proc. SPIE 3601, 256–267 (1999).

[Crossref]

J. Su, A. Karpiouk, B. Wang, and S. Emelianov, “Photoacoustic imaging of clinical metal needles in tissue,” J. Biomed. Opt. 15(2), 021309 (2010).

[Crossref]
[PubMed]

P. Ephrat, L. Keenliside, A. Seabrook, F. S. Prato, and J. J. L. Carson, “Three-dimensional photoacoustic imaging by sparse-array detection and iterative image reconstruction,” J. Biomed. Opt. 13(5), 054052 (2008).

[Crossref]
[PubMed]

G. J. Diebold, T. Sun, and M. I. Khan, “Photoacoustic monopole radiation in one, two, and three dimensions,” Phys. Rev. Lett. 67(24), 3384–3387 (1991).

[Crossref]
[PubMed]

K. Konstantinides, “Threshold bounds in SVD and a new iterative algorithm for order selection in Ar models,” IEEE Trans. Signal Process. 39(5), 1218–1221 (1991).

[Crossref]

K. Konstantinides and K. Yao, “Statistical analysis of effective singular values in matrix rank determination,” IEEE Trans. Acoust. Speech Signal Process. 36(5), 757–763 (1988).

[Crossref]

D. Frauchiger, K. P. Kostli, G. Paltauf, M. Frenz, and H. P. Weber, “Optoacoustic tomography using a two dimensional optical pressure transducer and two different reconstruction algorithms,” Proc. SPIE 4434, 74–80 (2001).

[Crossref]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

R. A. Kruger, D. R. Reinecke, and G. A. Kruger, “Thermoacoustic computed tomography—technical considerations,” Med. Phys. 26(9), 1832–1837 (1999).

[Crossref]
[PubMed]

R. A. Kruger, D. R. Reinecke, and G. A. Kruger, “Thermoacoustic computed tomography—technical considerations,” Med. Phys. 26(9), 1832–1837 (1999).

[Crossref]
[PubMed]

J. Provost and F. Lesage, “The application of compressed sensing for photo-acoustic tomography,” IEEE Trans. Med. Imaging 28(4), 585–594 (2009).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

A. A. Oraevsky, V. G. Andreev, A. A. Karabutov, and R. O. Esenaliev, “Two-dimensional opto-acoustic tomography transducer array and image reconstruction algorithm,” Proc. SPIE 3601, 256–267 (1999).

[Crossref]

G. Paltauf, J. A. Viator, S. A. Prahl, and S. L. Jacques, “Iterative reconstruction algorithm for optoacoustic imaging,” J. Acoust. Soc. Am. 112(4), 1536–1544 (2002).

[Crossref]
[PubMed]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

D. Frauchiger, K. P. Kostli, G. Paltauf, M. Frenz, and H. P. Weber, “Optoacoustic tomography using a two dimensional optical pressure transducer and two different reconstruction algorithms,” Proc. SPIE 4434, 74–80 (2001).

[Crossref]

G. Paltauf, J. A. Viator, S. A. Prahl, and S. L. Jacques, “Iterative reconstruction algorithm for optoacoustic imaging,” J. Acoust. Soc. Am. 112(4), 1536–1544 (2002).

[Crossref]
[PubMed]

P. Ephrat, L. Keenliside, A. Seabrook, F. S. Prato, and J. J. L. Carson, “Three-dimensional photoacoustic imaging by sparse-array detection and iterative image reconstruction,” J. Biomed. Opt. 13(5), 054052 (2008).

[Crossref]
[PubMed]

P. Ephrat, M. Roumeliotis, F. S. Prato, and J. J. Carson, “Four-dimensional photoacoustic imaging of moving targets,” Opt. Express 16(26), 21570–21581 (2008).

[Crossref]
[PubMed]

J. Provost and F. Lesage, “The application of compressed sensing for photo-acoustic tomography,” IEEE Trans. Med. Imaging 28(4), 585–594 (2009).

[Crossref]
[PubMed]

R. A. Kruger, D. R. Reinecke, and G. A. Kruger, “Thermoacoustic computed tomography—technical considerations,” Med. Phys. 26(9), 1832–1837 (1999).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

M. Roumeliotis, P. Ephrat, J. Patrick, and J. J. L. Carson, “Development and characterization of an omnidirectional photoacoustic point source for calibration of a staring 3D photoacoustic imaging system,” Opt. Express 17(17), 15228–15238 (2009).

[Crossref]
[PubMed]

P. Ephrat, M. Roumeliotis, F. S. Prato, and J. J. Carson, “Four-dimensional photoacoustic imaging of moving targets,” Opt. Express 16(26), 21570–21581 (2008).

[Crossref]
[PubMed]

P. Ephrat, L. Keenliside, A. Seabrook, F. S. Prato, and J. J. L. Carson, “Three-dimensional photoacoustic imaging by sparse-array detection and iterative image reconstruction,” J. Biomed. Opt. 13(5), 054052 (2008).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

J. Su, A. Karpiouk, B. Wang, and S. Emelianov, “Photoacoustic imaging of clinical metal needles in tissue,” J. Biomed. Opt. 15(2), 021309 (2010).

[Crossref]
[PubMed]

G. J. Diebold, T. Sun, and M. I. Khan, “Photoacoustic monopole radiation in one, two, and three dimensions,” Phys. Rev. Lett. 67(24), 3384–3387 (1991).

[Crossref]
[PubMed]

D. J. Kadrmas, E. C. Frey, and B. M. W. Tsui, “An SVD investigation of modeling scatter in multiple energy windows for improved SPECT images,” IEEE Trans. Nucl. Sci. 43(4), 2275–2284 (1996).

[Crossref]
[PubMed]

G. Paltauf, J. A. Viator, S. A. Prahl, and S. L. Jacques, “Iterative reconstruction algorithm for optoacoustic imaging,” J. Acoust. Soc. Am. 112(4), 1536–1544 (2002).

[Crossref]
[PubMed]

J. Su, A. Karpiouk, B. Wang, and S. Emelianov, “Photoacoustic imaging of clinical metal needles in tissue,” J. Biomed. Opt. 15(2), 021309 (2010).

[Crossref]
[PubMed]

M. H. Xu and L. V. Wang, “Universal back-projection algorithm for photoacoustic computed tomography,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys. 71(1), 016706 (2005).

[Crossref]
[PubMed]

L. V. Wang, “Ultrasound-mediated biophotonic imaging: a review of acousto-optical tomography and photo-acoustic tomography,” Dis. Markers 19(2-3), 123–138 (2003-2004).

[PubMed]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

D. Frauchiger, K. P. Kostli, G. Paltauf, M. Frenz, and H. P. Weber, “Optoacoustic tomography using a two dimensional optical pressure transducer and two different reconstruction algorithms,” Proc. SPIE 4434, 74–80 (2001).

[Crossref]

M. H. Xu and L. V. Wang, “Universal back-projection algorithm for photoacoustic computed tomography,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys. 71(1), 016706 (2005).

[Crossref]
[PubMed]

K. Konstantinides and K. Yao, “Statistical analysis of effective singular values in matrix rank determination,” IEEE Trans. Acoust. Speech Signal Process. 36(5), 757–763 (1988).

[Crossref]

L. V. Wang, “Ultrasound-mediated biophotonic imaging: a review of acousto-optical tomography and photo-acoustic tomography,” Dis. Markers 19(2-3), 123–138 (2003-2004).

[PubMed]

K. P. Kostli, D. Frauchiger, J. J. Niederhauser, G. Paltauf, H. P. Weber, and M. Frenz, “Optoacoustic imaging using a three-dimensional reconstruction algorithm,” IEEE J. Sel. Top. Quantum Electron. 7(6), 918–923 (2001).

[Crossref]

K. Konstantinides and K. Yao, “Statistical analysis of effective singular values in matrix rank determination,” IEEE Trans. Acoust. Speech Signal Process. 36(5), 757–763 (1988).

[Crossref]

J. Provost and F. Lesage, “The application of compressed sensing for photo-acoustic tomography,” IEEE Trans. Med. Imaging 28(4), 585–594 (2009).

[Crossref]
[PubMed]

D. J. Kadrmas, E. C. Frey, and B. M. W. Tsui, “An SVD investigation of modeling scatter in multiple energy windows for improved SPECT images,” IEEE Trans. Nucl. Sci. 43(4), 2275–2284 (1996).

[Crossref]
[PubMed]

K. Konstantinides, “Threshold bounds in SVD and a new iterative algorithm for order selection in Ar models,” IEEE Trans. Signal Process. 39(5), 1218–1221 (1991).

[Crossref]

G. Paltauf, J. A. Viator, S. A. Prahl, and S. L. Jacques, “Iterative reconstruction algorithm for optoacoustic imaging,” J. Acoust. Soc. Am. 112(4), 1536–1544 (2002).

[Crossref]
[PubMed]

P. Ephrat, L. Keenliside, A. Seabrook, F. S. Prato, and J. J. L. Carson, “Three-dimensional photoacoustic imaging by sparse-array detection and iterative image reconstruction,” J. Biomed. Opt. 13(5), 054052 (2008).

[Crossref]
[PubMed]

S. Ashkenazi, “Photoacoustic lifetime imaging of dissolved oxygen using methylene blue,” J. Biomed. Opt. 15(4), 040501 (2010).

[Crossref]
[PubMed]

J. Su, A. Karpiouk, B. Wang, and S. Emelianov, “Photoacoustic imaging of clinical metal needles in tissue,” J. Biomed. Opt. 15(2), 021309 (2010).

[Crossref]
[PubMed]

R. A. Kruger, D. R. Reinecke, and G. A. Kruger, “Thermoacoustic computed tomography—technical considerations,” Med. Phys. 26(9), 1832–1837 (1999).

[Crossref]
[PubMed]

P. Ephrat, M. Roumeliotis, F. S. Prato, and J. J. Carson, “Four-dimensional photoacoustic imaging of moving targets,” Opt. Express 16(26), 21570–21581 (2008).

[Crossref]
[PubMed]

M. Roumeliotis, P. Ephrat, J. Patrick, and J. J. L. Carson, “Development and characterization of an omnidirectional photoacoustic point source for calibration of a staring 3D photoacoustic imaging system,” Opt. Express 17(17), 15228–15238 (2009).

[Crossref]
[PubMed]

D. W. Wilson and H. H. Barrett, “Decomposition of images and objects into measurement and null components,” Opt. Express 2(6), 254–260 (1998).

[Crossref]
[PubMed]

M. Roumeliotis, R. Z. Stodilka, M. A. Anastasio, G. Chaudhary, H. Al-Aabed, E. Ng, A. Immucci, and J. J. L. Carson, “Analysis of a photoacoustic imaging system by the crosstalk matrix and singular value decomposition,” Opt. Express 18(11), 11406–11417 (2010).

[Crossref]
[PubMed]

M. H. Xu and L. V. Wang, “Universal back-projection algorithm for photoacoustic computed tomography,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys. 71(1), 016706 (2005).

[Crossref]
[PubMed]

G. J. Diebold, T. Sun, and M. I. Khan, “Photoacoustic monopole radiation in one, two, and three dimensions,” Phys. Rev. Lett. 67(24), 3384–3387 (1991).

[Crossref]
[PubMed]

D. Frauchiger, K. P. Kostli, G. Paltauf, M. Frenz, and H. P. Weber, “Optoacoustic tomography using a two dimensional optical pressure transducer and two different reconstruction algorithms,” Proc. SPIE 4434, 74–80 (2001).

[Crossref]

A. A. Oraevsky, V. G. Andreev, A. A. Karabutov, and R. O. Esenaliev, “Two-dimensional opto-acoustic tomography transducer array and image reconstruction algorithm,” Proc. SPIE 3601, 256–267 (1999).

[Crossref]

M. Frenz, K. P. Kostli, G. Paltauf, H. Schmidt-Kloiber, and H. P. Weber, “Reconstruction technique for optoacoustic imaging,” in Biomedical Optoacoustics II, January 23–24, 2001 (SPIE), 130–137.

P. Ephrat and J. J. L. Carson, “Measurement of photoacoustic detector sensitivity distribution by robotic source placement,” in 9th Conference on Photons Plus Ultrasound: Imaging and Sensing 2008, January 20–23, 2008 (SPIE).