Abstract

Recently the effects of reduced bit-depth acquisition on swept-source optical coherence tomography (SS-OCT) image quality have been evaluated by using simulations and empirical studies, showing that image acquisition at 8-bit depth allows high system sensitivity with only a minimal drop in the signal-to-noise ratio compared to higher bit-depth systems. However, in these studies the 8-bit data is actually 12- or 14-bit ADC data numerically truncated to 8 bits. In practice, a native 8-bit ADC could actually possess a true bit resolution lower than this due to the electronic jitter in the converter etc. We compare true 8- and 14-bit-depth imaging of SS-OCT and polarization-sensitive SS-OCT (PS-SS-OCT) by using two hardware-synchronized high-speed data acquisition (DAQ) boards. The two DAQ boards read exactly the same imaging data for comparison. The measured system sensitivity at 8-bit depth is comparable to that for 14-bit acquisition when using the more sensitive of the available full analog input voltage ranges of the ADC. Ex-vivo structural and birefringence images of equine tendon indicate no significant differences between images acquired by the two DAQ boards suggesting that 8-bit DAQ boards can be employed to increase imaging speeds and reduce storage in clinical SS-OCT/PS-SS-OCT systems. One possible disadvantage is a reduced imaging dynamic range which can manifest itself as an increase in image artifacts due to strong Fresnel reflection.

© 2011 OSA

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  1. P. H. Tomlins and R. K. Wang, “Theory, developments and applications of optical coherence tomography,” J. Phys. D Appl. Phys. 38(15), 2519–2535 (2005).
    [CrossRef]
  2. W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, “115 kHz tuning repetition rate ultrahigh-speed wavelength-swept semiconductor laser,” Opt. Lett. 30(23), 3159–3161 (2005).
    [CrossRef] [PubMed]
  3. R. Huber, M. Wojtkowski, and J. G. Fujimoto, “Fourier Domain Mode Locking (FDML): A new laser operating regime and applications for optical coherence tomography,” Opt. Express 14(8), 3225–3237 (2006).
    [CrossRef] [PubMed]
  4. R. Huber, D. C. Adler, and J. G. Fujimoto, “Buffered Fourier domain mode locking: Unidirectional swept laser sources for optical coherence tomography imaging at 370,000 lines/s,” Opt. Lett. 31(20), 2975–2977 (2006).
    [CrossRef] [PubMed]
  5. R. Huber, D. C. Adler, V. J. Srinivasan, and J. G. Fujimoto, “Fourier domain mode locking at 1050 nm for ultra-high-speed optical coherence tomography of the human retina at 236,000 axial scans per second,” Opt. Lett. 32(14), 2049–2051 (2007).
    [CrossRef] [PubMed]
  6. B. Potsaid, I. Gorczynska, V. J. Srinivasan, Y. Chen, J. Jiang, A. Cable, and J. G. Fujimoto, “Ultrahigh speed spectral / Fourier domain OCT ophthalmic imaging at 70,000 to 312,500 axial scans per second,” Opt. Express 16(19), 15149–15169 (2008).
    [CrossRef] [PubMed]
  7. S. H. Yun, C. Boudoux, G. J. Tearney, and B. E. Bouma, “High-speed wavelength-swept semiconductor laser with a polygon-scanner-based wavelength filter,” Opt. Lett. 28(20), 1981–1983 (2003).
    [CrossRef] [PubMed]
  8. M. Yamanari, S. Makita, Y. Lim, and Y. Yasuno, “Full-range polarization-sensitive swept-source optical coherence tomography by simultaneous transversal and spectral modulation,” Opt. Express 18(13), 13964–13980 (2010).
    [CrossRef] [PubMed]
  9. W.-Y. Oh, B. J. Vakoc, M. Shishkov, G. J. Tearney, and B. E. Bouma, “>400 kHz repetition rate wavelength-swept laser and application to high-speed optical frequency domain imaging,” Opt. Lett. 35(17), 2919–2921 (2010).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  12. W. Wieser, B. R. Biedermann, T. Klein, C. M. Eigenwillig, and R. Huber, “Multi-megahertz OCT: High quality 3D imaging at 20 million A-scans and 4.5 GVoxels per second,” Opt. Express 18(14), 14685–14704 (2010).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  20. Y. L. Chen, D. M. de Bruin, C. Kerbage, and J. F. de Boer, “Spectrally balanced detection for optical frequency domain imaging,” Opt. Express 15(25), 16390–16399 (2007).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  23. J. F. de Boer, T. E. Milner, M. J. C. van Gemert, and J. S. Nelson, “Two-dimensional birefringence imaging in biological tissue by polarization-sensitive optical coherence tomography,” Opt. Lett. 22(12), 934–936 (1997).
    [CrossRef] [PubMed]
  24. J. F. de Boer, T. E. Milner, and J. S. Nelson, “Determination of the depth-resolved Stokes parameters of light backscattered from turbid media by use of polarization-sensitive optical coherence tomography,” Opt. Lett. 24(5), 300–302 (1999).
    [CrossRef] [PubMed]
  25. C. E. Saxer, J. F. de Boer, B. H. Park, Y. Zhao, Z. Chen, and J. S. Nelson, “High-speed fiber based polarization-sensitive optical coherence tomography of in vivo human skin,” Opt. Lett. 25(18), 1355–1357 (2000).
    [CrossRef] [PubMed]
  26. G. Yao and L. V. Wang, “Two-dimensional depth-resolved Mueller matrix characterization of biological tissue by optical coherence tomography,” Opt. Lett. 24(8), 537–539 (1999).
    [CrossRef] [PubMed]

2010

2009

2008

2007

2006

2005

2004

2003

2001

2000

1999

1997

1992

Adler, D. C.

Aoki, G.

Biedermann, B. R.

Boudoux, C.

Bouma, B. E.

Cable, A.

Cense, B.

Chen, Y.

Chen, Y. L.

Chen, Z.

de Boer, J. F.

Y. L. Chen, D. M. de Bruin, C. Kerbage, and J. F. de Boer, “Spectrally balanced detection for optical frequency domain imaging,” Opt. Express 15(25), 16390–16399 (2007).
[CrossRef] [PubMed]

B. Hyle Park, M. C. Pierce, B. Cense, and J. F. de Boer, “Optic axis determination accuracy for fiber-based polarization-sensitive optical coherence tomography,” Opt. Lett. 30(19), 2587–2589 (2005).
[CrossRef] [PubMed]

B. Hyle Park, M. C. Pierce, B. Cense, and J. F. de Boer, “Jones matrix analysis for a polarization-sensitive optical coherence tomography system using fiber-optic components,” Opt. Lett. 29(21), 2512–2514 (2004).
[CrossRef] [PubMed]

S. H. Yun, G. J. Tearney, J. F. de Boer, N. Iftimia, and B. E. Bouma, “High-speed optical frequency-domain imaging,” Opt. Express 11(22), 2953–2963 (2003).
[CrossRef] [PubMed]

C. E. Saxer, J. F. de Boer, B. H. Park, Y. Zhao, Z. Chen, and J. S. Nelson, “High-speed fiber based polarization-sensitive optical coherence tomography of in vivo human skin,” Opt. Lett. 25(18), 1355–1357 (2000).
[CrossRef] [PubMed]

J. F. de Boer, T. E. Milner, and J. S. Nelson, “Determination of the depth-resolved Stokes parameters of light backscattered from turbid media by use of polarization-sensitive optical coherence tomography,” Opt. Lett. 24(5), 300–302 (1999).
[CrossRef] [PubMed]

J. F. de Boer, T. E. Milner, M. J. C. van Gemert, and J. S. Nelson, “Two-dimensional birefringence imaging in biological tissue by polarization-sensitive optical coherence tomography,” Opt. Lett. 22(12), 934–936 (1997).
[CrossRef] [PubMed]

de Bruin, D. M.

Eigenwillig, C. M.

Endo, T.

Fercher, A. F.

Freilich, M. I.

Fujimoto, J. G.

Goetzinger, E.

Goldberg, B. D.

Gorczynska, I.

Hee, M. R.

Hitzenberger, C. K.

Huang, D.

Huber, R.

Hyle Park, B.

Hyle Park, B.

Iftimia, N.

Itoh, M.

Jiang, J.

Jiao, S. L.

Kerbage, C.

Klein, T.

Lim, Y.

Madjarova, V. D.

Makita, S.

Milner, T. E.

Nelson, J. S.

Oh, W. Y.

Oh, W.-Y.

Park, B. H.

Pierce, M. C.

Pircher, M.

Potsaid, B.

Saxer, C. E.

Shishkov, M.

Srinivasan, V. J.

Sticker, M.

Stoica, G.

Sumimura, H.

Suter, M. J.

Swanson, E. A.

Tearney, G. J.

Todorovic, M.

Tomlins, P. H.

P. H. Tomlins and R. K. Wang, “Theory, developments and applications of optical coherence tomography,” J. Phys. D Appl. Phys. 38(15), 2519–2535 (2005).
[CrossRef]

Vakoc, B. J.

van Gemert, M. J. C.

Wang, L. V.

Wang, R. K.

P. H. Tomlins and R. K. Wang, “Theory, developments and applications of optical coherence tomography,” J. Phys. D Appl. Phys. 38(15), 2519–2535 (2005).
[CrossRef]

Waxman, S.

Wieser, W.

Wojtkowski, M.

Yamanari, M.

Yao, G.

Yasuno, Y.

Yatagai, T.

Yun, S. H.

Zhao, Y.

Appl. Opt.

J. Opt. Soc. Am. B

J. Phys. D Appl. Phys.

P. H. Tomlins and R. K. Wang, “Theory, developments and applications of optical coherence tomography,” J. Phys. D Appl. Phys. 38(15), 2519–2535 (2005).
[CrossRef]

Opt. Express

Y. Yasuno, S. Makita, T. Endo, G. Aoki, H. Sumimura, M. Itoh, and T. Yatagai, “One-shot-phase-shifting Fourier domain optical coherence tomography by reference wavefront tilting,” Opt. Express 12(25), 6184–6191 (2004).
[CrossRef] [PubMed]

R. Huber, M. Wojtkowski, and J. G. Fujimoto, “Fourier Domain Mode Locking (FDML): A new laser operating regime and applications for optical coherence tomography,” Opt. Express 14(8), 3225–3237 (2006).
[CrossRef] [PubMed]

M. Yamanari, S. Makita, V. D. Madjarova, T. Yatagai, and Y. Yasuno, “Fiber-based polarization-sensitive Fourier domain optical coherence tomography using B-scan-oriented polarization modulation method,” Opt. Express 14(14), 6502–6515 (2006).
[CrossRef] [PubMed]

C. K. Hitzenberger, E. Goetzinger, M. Sticker, M. Pircher, and A. F. Fercher, “Measurement and imaging of birefringence and optic axis orientation by phase resolved polarization sensitive optical coherence tomography,” Opt. Express 9(13), 780–790 (2001).
[CrossRef] [PubMed]

S. H. Yun, G. J. Tearney, J. F. de Boer, N. Iftimia, and B. E. Bouma, “High-speed optical frequency-domain imaging,” Opt. Express 11(22), 2953–2963 (2003).
[CrossRef] [PubMed]

Y. L. Chen, D. M. de Bruin, C. Kerbage, and J. F. de Boer, “Spectrally balanced detection for optical frequency domain imaging,” Opt. Express 15(25), 16390–16399 (2007).
[CrossRef] [PubMed]

M. Yamanari, S. Makita, and Y. Yasuno, “Polarization-sensitive swept-source optical coherence tomography with continuous source polarization modulation,” Opt. Express 16(8), 5892–5906 (2008).
[CrossRef] [PubMed]

B. Potsaid, I. Gorczynska, V. J. Srinivasan, Y. Chen, J. Jiang, A. Cable, and J. G. Fujimoto, “Ultrahigh speed spectral / Fourier domain OCT ophthalmic imaging at 70,000 to 312,500 axial scans per second,” Opt. Express 16(19), 15149–15169 (2008).
[CrossRef] [PubMed]

M. Yamanari, Y. Lim, S. Makita, and Y. Yasuno, “Visualization of phase retardation of deep posterior eye by polarization-sensitive swept-source optical coherence tomography with 1-µm probe,” Opt. Express 17(15), 12385–12396 (2009).
[CrossRef] [PubMed]

B. D. Goldberg, B. J. Vakoc, W. Y. Oh, M. J. Suter, S. Waxman, M. I. Freilich, B. E. Bouma, and G. J. Tearney, “Performance of reduced bit-depth acquisition for optical frequency domain imaging,” Opt. Express 17(19), 16957–16968 (2009).
[CrossRef] [PubMed]

M. Yamanari, S. Makita, Y. Lim, and Y. Yasuno, “Full-range polarization-sensitive swept-source optical coherence tomography by simultaneous transversal and spectral modulation,” Opt. Express 18(13), 13964–13980 (2010).
[CrossRef] [PubMed]

W. Wieser, B. R. Biedermann, T. Klein, C. M. Eigenwillig, and R. Huber, “Multi-megahertz OCT: High quality 3D imaging at 20 million A-scans and 4.5 GVoxels per second,” Opt. Express 18(14), 14685–14704 (2010).
[CrossRef] [PubMed]

Opt. Lett.

W.-Y. Oh, B. J. Vakoc, M. Shishkov, G. J. Tearney, and B. E. Bouma, “>400 kHz repetition rate wavelength-swept laser and application to high-speed optical frequency domain imaging,” Opt. Lett. 35(17), 2919–2921 (2010).
[CrossRef] [PubMed]

B. Hyle Park, M. C. Pierce, B. Cense, and J. F. de Boer, “Jones matrix analysis for a polarization-sensitive optical coherence tomography system using fiber-optic components,” Opt. Lett. 29(21), 2512–2514 (2004).
[CrossRef] [PubMed]

S. H. Yun, C. Boudoux, G. J. Tearney, and B. E. Bouma, “High-speed wavelength-swept semiconductor laser with a polygon-scanner-based wavelength filter,” Opt. Lett. 28(20), 1981–1983 (2003).
[CrossRef] [PubMed]

J. F. de Boer, T. E. Milner, M. J. C. van Gemert, and J. S. Nelson, “Two-dimensional birefringence imaging in biological tissue by polarization-sensitive optical coherence tomography,” Opt. Lett. 22(12), 934–936 (1997).
[CrossRef] [PubMed]

J. F. de Boer, T. E. Milner, and J. S. Nelson, “Determination of the depth-resolved Stokes parameters of light backscattered from turbid media by use of polarization-sensitive optical coherence tomography,” Opt. Lett. 24(5), 300–302 (1999).
[CrossRef] [PubMed]

G. Yao and L. V. Wang, “Two-dimensional depth-resolved Mueller matrix characterization of biological tissue by optical coherence tomography,” Opt. Lett. 24(8), 537–539 (1999).
[CrossRef] [PubMed]

C. E. Saxer, J. F. de Boer, B. H. Park, Y. Zhao, Z. Chen, and J. S. Nelson, “High-speed fiber based polarization-sensitive optical coherence tomography of in vivo human skin,” Opt. Lett. 25(18), 1355–1357 (2000).
[CrossRef] [PubMed]

R. Huber, D. C. Adler, and J. G. Fujimoto, “Buffered Fourier domain mode locking: Unidirectional swept laser sources for optical coherence tomography imaging at 370,000 lines/s,” Opt. Lett. 31(20), 2975–2977 (2006).
[CrossRef] [PubMed]

R. Huber, D. C. Adler, V. J. Srinivasan, and J. G. Fujimoto, “Fourier domain mode locking at 1050 nm for ultra-high-speed optical coherence tomography of the human retina at 236,000 axial scans per second,” Opt. Lett. 32(14), 2049–2051 (2007).
[CrossRef] [PubMed]

B. Hyle Park, M. C. Pierce, B. Cense, and J. F. de Boer, “Optic axis determination accuracy for fiber-based polarization-sensitive optical coherence tomography,” Opt. Lett. 30(19), 2587–2589 (2005).
[CrossRef] [PubMed]

W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, “115 kHz tuning repetition rate ultrahigh-speed wavelength-swept semiconductor laser,” Opt. Lett. 30(23), 3159–3161 (2005).
[CrossRef] [PubMed]

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Figures (7)

Fig. 1
Fig. 1

Schematic diagram of the system. SS: wavelength-swept source, PC: polarization controller, LP: linear polarizer, EOM: electro-optic modulator, FC: fiber-optic circulator, BS: non-polarizing beamsplitter, PBS: polarization beamsplitter, H and V: balanced photo-detectors for horizontally and vertically polarized optical signals, respectively.

Fig. 2
Fig. 2

DAQ noise measurements at different set FIVR for 14-bit DAQ (left) and example ADC counts at the set FIVR of ± 0.2V for 8-bit DAQ (right), respectively.

Fig. 3
Fig. 3

DAQ plus receiver noise measurements at different set FIVR for 14-bit (a) and 8-bit DAQ (b), respectively. (c): standard deviation of the measured DAQ plus receiver noise along with the calculated noise standard deviation of quantization noise of the DAQ using Eq. (5) at different set FIVR.

Fig. 4
Fig. 4

Sensitivity measurements versus full input voltage range for the two DAQ boards.

Fig. 5
Fig. 5

Comparison of OCT images of the same sample (human finger skin) acquired with 14-bit (top) and 8-bit (bottom) DAQ boards respectively in our system. The RMSE and MAE differences between the images produced by native 14-bit raw signal and numerically truncated reduced-bit signal are also included (bottom). Image size is 4 (transversal) × 2.5mm (axial).

Fig. 6
Fig. 6

Images taken using 8-bit (left) and 14-bit (right) DAQ boards respectively in the PS-SS-OCT system at different set FIVR. (a)-(b): for human finger skin; (c) for an equine tendon sample. Image size is 4 (transversal) × 2.5mm (axial).

Fig. 7
Fig. 7

Intensity (a) and phase retardance (b) images for the equine tendon sample obtained using 8-bit (left) and 14-bit (right) DAQ boards respectively in the PS-SS-OCT system. Image size is 4 (transversal) × 0.8mm (axial). The phase retardance images are shown in gray scale from black (−180°) to white (180°). (c): Example single A-scan comparison of the two retardance images.

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

J m e a s u r e d = ( ( I ˜ h 0 * + I ˜ h 1 * J 1 ( A 0 ) ) I ˜ h 0 * I ˜ h 1 * J 1 ( A 0 ) ) ( I ˜ v 0 * + I ˜ v 1 * J 1 ( A 0 ) ) I ˜ v 0 * I ˜ v 1 * J 1 ( A 0 ) ) ) ,
J m e a s u r e d = J o u t J s a m p l e J i n ,
J s u r f a c e = J o u t J i n .
J c , m = J m e a s u r e d J s u r f a c e 1 = J o u t J s a m p l e J o u t 1 = J U ( p 1 e ( i η / 2 ) 0 0 p 2 e ( i η / 2 ) ) J U 1 ,
σ q n = V max 3 2 b ,

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