scholarly journals Spectral domain optical coherence tomography: a better OCT imaging strategy

BioTechniques ◽  
2005 ◽  
Vol 39 (6S) ◽  
pp. S6-S13 ◽  
Author(s):  
Zahid Yaqoob ◽  
Jigang Wu ◽  
Changhuei Yang
Keyword(s):  
Optical Coherence Tomography ◽  
Spectral Domain ◽  
Optical Coherence ◽  
Imaging Strategy ◽  
Oct Imaging

scholarly journals Virtual-OCT: A simulated optical coherence tomography instrument

2014 ◽  
Vol 07 (05) ◽  
pp. 1450030 ◽  
Author(s):  
Ning Liu ◽  
Cuixia Dai ◽  
Yuanhe Tang ◽  
Peng Xi
Keyword(s):  
Optical Coherence Tomography ◽  
Dynamic Range ◽  
Partial Coherence ◽  
Spectral Domain ◽  
Optical Coherence ◽  
Algorithm Optimization ◽  
Virtual Instrumentation ◽  
Parameter Evaluation ◽  
Oct Imaging ◽  
Sd Oct

We report the virtual instrumentation of both time-domain (TD) and spectral-domain (SD) optical coherence tomography (OCT) systems. With a virtual partial coherence source from either a simulated or measured spectrum, the OCT signals of both A-scan and B-scan were demonstrated. The spectrometric detector's pixel number, dynamic range, noise, as well as spectral resolution can be simulated in the virtual spectral domain (SD-OCT). The virtual-OCT system provides an environment for parameter evaluation and algorithm optimization for experimental OCT instrumentation, and promotes the understanding of OCT imaging and signal post-processing processes.

scholarly journals Spectral Domain Optical Coherence Tomography Imaging Performance Improvement Based on Field Curvature Aberration-Corrected Spectrometer

2020 ◽  
Vol 10 (10) ◽  
pp. 3657
Author(s):  
Seung Seok Lee ◽  
Woosub Song ◽  
Eun Seo Choi
Keyword(s):  
Optical Coherence Tomography ◽  
Spectral Domain ◽  
Optical Coherence ◽  
Modulation Transfer ◽  
Field Curvature ◽  
Spatial Frequencies ◽  
Oct Imaging ◽  
Imaging Depth ◽  
Imaging Performance ◽  
Sd Oct

We designed and fabricated a telecentric f-theta imaging lens (TFL) to improve the imaging performance of spectral domain optical coherence tomography (SD-OCT). By tailoring the field curvature aberration of the TFL, the flattened focal surface was well matched to the detector plane. Simulation results showed that the spot in the focal plane fitted well within a single pixel and the modulation transfer function at high spatial frequencies showed higher values compared with those of an achromatic doublet imaging lens, which are commonly used in SD-OCT spectrometers. The spectrometer using the TFL had an axial resolution of 7.8 μm, which was similar to the theoretical value of 6.2 μm. The spectrometer was constructed so that the achromatic doublet lens was replaced by the TFL. As a result, the SD-OCT imaging depth was improved by 13% (1.85 mm) on a 10 dB basis in the roll-off curve and showed better sensitivity at the same depth. The SD-OCT images of a multi-layered tape and a human palm proved that the TFL was able to achieve deeper imaging depth and better contrast. This feature was seen very clearly in the depth profile of the image. SD-OCT imaging performance can be improved simply by changing the spectrometer’s imaging lens. By optimizing the imaging lens, deeper SD-OCT imaging can be achieved with improved sensitivity.

scholarly journals Comparison of Physiologic versus Pharmacologic Mydriasis on Anterior Chamber Angle Measurements Using Spectral Domain Optical Coherence Tomography

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Anna I. Dastiridou ◽  
Xiaojing Pan ◽  
ZhouYuan Zhang ◽  
Kenneth M. Marion ◽  
Brian A. Francis ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Spectral Domain ◽  
Optical Coherence ◽  
Anterior Chamber Angle ◽  
Lighting Condition ◽  
Inferior Angle ◽  
Oct Imaging ◽  
Chamber Angle ◽  
Sd Oct

Purpose. To compare the effects of physiologic versus pharmacologic pupil dilation on anterior chamber angle (ACA) measurements obtained with spectral domain optical coherence tomography (SD-OCT).Methods. Forty eyes from 20 healthy, phakic individuals with open angles underwent anterior segment OCT imaging under 3 pupillary states: (1) pupil constricted under standard room lighting, (2) physiologic mydriasis in a darkened room, and (3) postpharmacologic mydriasis. Inferior angle Schwalbe’s line-angle opening distance (SL-AOD) and SL-trabecular-iris-space area (SL-TISA) were computed for each eye and pupillary condition by masked, certified Reading Center graders using customized grading software.Results. SL-AOD and SL-TISA under pupillary constriction to room light were0.87±0.31 mm and0.33±0.14 mm2, respectively; decreased to0.75±0.29 mmP<0.01and0.29±0.13 mm2  P<0.01, respectively, under physiologic mydriasis; and increased to0.90±0.38 mmP<0.01and0.34±0.17 mm2  P=0.06under pharmacologic mydriasis compared to baseline.Conclusions. Using SD-OCT imaging, pharmacologic mydriasis yielded the widest angle opening, whereas physiologic mydriasis yielded the most angle narrowing in normal individuals with open iridocorneal angles. Accounting for the state of the pupil and standardizing the lighting condition would appear to be of importance for future studies of the angle.

Is high-resolution spectral domain optical coherence tomography reliable in nystagmus?

2011 ◽  
Vol 97 (4) ◽  
pp. 534.1-536 ◽  
Author(s):  
Mervyn G Thomas ◽  
Anil Kumar ◽  
John R Thompson ◽  
Frank A Proudlock ◽  
Kees Straatman ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Resolution ◽  
Spectral Domain ◽  
Optical Coherence
Sign in / Sign up

Export Citation Format

Share Document