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Performance comparison between 8- and 14-bit-depth imaging in polarization-sensitive swept-source optical coherence tomography.
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.
Publication Date: 2011-03-04 PubMed ID: 21483604PubMed Central: PMC3072122DOI: 10.1364/BOE.2.000794Google Scholar: Lookup The Equine Research Bank provides access to a large database of publicly available scientific literature. Inclusion in the Research Bank does not imply endorsement of study methods or findings by Mad Barn.
- Journal Article
Summary
This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.
The research work compares the performance of 8-bit and 14-bit image acquisition in Swept-Source Optical Coherence Tomography (SS-OCT) and Polarization-Sensitive SS-OCT (PS-SS-OCT). The findings suggest that using an 8-bit data acquisition board can maintain high system sensitivity, increase imaging speeds, and reduce storage while only marginally decreasing imaging dynamic range.
Study Overview
- The research examines the implications of reduced bit-depth acquisition on the image quality of SS-OCT and PS-SS-OCT systems. The comparison is done between 8-bit and 14-bit imaging.
- Previous studies considered 8-bit data derived from numerically truncated 12- or 14-bit ADC data. However, this study uses true 8-bit ADC for the comparison to account for electronic jitter in the converter that can potentially reduce bit resolution.
Methodology
- The researchers used two hardware-synchronized high-speed data acquisition (DAQ) boards for the comparison. Both the DAQ boards read exactly the same imaging data, ensuring a fair comparison.
- Ex-vivo structural and birefringence images of equine tendon were used for comparison. This helped validate the findings in a “real world” application, showcasing the potential implications on clinical SS-OCT/PS-SS-OCT systems.
Findings
- The researchers observed that the system sensitivity at 8-bit depth is comparable to that for 14-bit acquisition when using the more sensitive of the full analog input voltage ranges.
- There were no significant differences between images acquired by the two DAQ boards, suggesting 8-bit DAQ boards can be employed to increase imaging speeds and reduce storage.
- One possible disadvantage of an 8-bit board was observed: a reduced imaging dynamic range. This could potentially lead to an increase in image artifacts due to strong Fresnel reflection. However, the magnitude of this disadvantage was not quantified in the study.
Implications
- The study brings important implications for clinical SS-OCT and PS-SS-OCT systems, suggesting they can effectively utilize 8-bit DAQ boards to boost speeds and decrease storage needs.
- As these systems are widely used in ophthalmic imaging and related applications, the results can hasten the integration and adoption of 8-bit ADCs in their design and operation, provided the trade-off due to reduced imaging dynamic range is deemed acceptable for the specific application at hand.
Cite This Article
APA
Lu Z, Kasaragod DK, Matcher SJ.
(2011).
Performance comparison between 8- and 14-bit-depth imaging in polarization-sensitive swept-source optical coherence tomography.
Biomed Opt Express, 2(4), 794-804.
https://doi.org/10.1364/BOE.2.000794 Publication
Researcher Affiliations
- Department of Materials Science and Engineering, the Kroto Research Institute, University of Sheffield, North Campus, Broad Lane, Sheffield, S3 7HQ, UK.
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Citations
This article has been cited 3 times.- Hao Q, Zhou K, Yang J, Hu Y, Chai Z, Ma Y, Liu G, Zhao Y, Gao S, Liu J. High signal-to-noise ratio reconstruction of low bit-depth optical coherence tomography using deep learning. J Biomed Opt 2020 Nov;25(12).
- Dsouza R, Won J, Monroy GL, Spillman DR, Boppart SA. Economical and compact briefcase spectral-domain optical coherence tomography system for primary care and point-of-care applications. J Biomed Opt 2018 Sep;23(9):1-11.
- Wang Y, Wei W, Pei X, Zhan H, Tang Y, Li Y, Bai J, Li J. PDC-DETR: a Parallel Dilated Convolutional Detection Transformer for preliminary screening of multiple macular degeneration. BMC Med Imaging 2025 Nov 3;25(1):439.
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