Abstract
We compare true 8 and 14 bit-depth imaging of SS-OCT and polarization-sensitive SS-OCT (PS-SS-OCT) at 1.3μm wavelength 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 an equine tendon sample 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. We also compare the resulting image quality when the image data sampled with the 14-bit DAQ from human finger skin is artificially bit-reduced during post-processing. However, in agreement with the results reported previously, we also observe that in our system that real-world 8-bit image shows more artifacts than the image acquired by numerically truncating to 8-bits from the raw 14-bit image data, especially in low intensity image area. This is due to the higher noise floor and reduced dynamic range of the 8-bit DAQ. One possible disadvantage is a reduced imaging dynamic range which can manifest itself as an increase in image artefacts due to strong Fresnel reflection.
Original language | English |
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Title of host publication | Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV |
Editors | James G. Fujimoto, Joseph A. Izatt, Valery V. Tuchin |
Publisher | SPIE |
Number of pages | 9 |
Volume | 7889 |
ISBN (Print) | 9780819484260 |
DOIs | |
Publication status | Published - 11 Feb 2011 |
Externally published | Yes |
Event | Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV - San Francisco, United States Duration: 22 Jan 2011 → 27 Jan 2011 Conference number: 15 |
Publication series
Name | Progress in Biomedical Optics and Imaging - Proceedings of SPIE |
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Volume | 7889 |
ISSN (Print) | 1605-7422 |
Conference
Conference | Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV |
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Country/Territory | United States |
City | San Francisco |
Period | 22/01/11 → 27/01/11 |