scholarly journals Spectroscopic OCT by Grating-Based Temporal Correlation Coupled to Optical Spectral Analysis

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
L. Froehly ◽  
M. Ouadour ◽  
L. Furfaro ◽  
P. Sandoz ◽  
P. Leproux ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Spectral Analysis ◽  
Numerical Calculation ◽  
Functional Imaging ◽  
Temporal Correlation ◽  
Image Sensor ◽  
Optical Coherence ◽  
A Posteriori ◽  
Spectroscopic Information ◽  
Spectrally Resolved

Spectroscopic optical coherence tomography (spectroscopic OCT) is an echographic-like optical method for biomedical functional imaging. Current spectroscopic optical coherence tomography (OCT) methods rely on a posteriori numerical calculation. We present an alternative for optically accessing the spectroscopic information in OCT, that is, without postprocessing, by using a grating-based correlation and a wavelength demultiplexing system. Spectrally resolved A-scan is directly recorded on the image sensor. Due to the grating-based system, no correlation scan is necessary. The signal is registered in the wavelength-depth plane on a 2D camera that provides a large number of resolved points. In the frame of this paper, we present the principle of the system as well as demonstration results. Advantages and drawback of this system compared to others are discussed.

scholarly journals Optical Coherence Tomography as a Tool for Ocular Dynamics Estimation

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Damian Siedlecki ◽  
Waldemar Kowalik ◽  
Henryk Kasprzak
Keyword(s):  
Heart Rate ◽  
Optical Coherence Tomography ◽  
Spectral Analysis ◽  
High Speed ◽  
Anterior Segment ◽  
Power Spectra ◽  
Optical Coherence ◽  
Tomographic Images ◽  
Noninvasive Estimation ◽  
Ocular Hemodynamics

Purpose. The aim of the study is to demonstrate that the ocular dynamics of the anterior chamber of the eye can be estimated quantitatively by means of optical coherence tomography (OCT).Methods. A commercial high speed, high resolution optical coherence tomographer was used. The sequences of tomographic images of the iridocorneal angle of three subjects were captured and each image from the sequence was processed in MATLAB environment in order to detect and identify the contours of the cornea and iris. The data on pulsatile displacements of the cornea and iris and the changes of the depth of the gap between them were retrieved from the sequences. Finally, the spectral analysis of the changes of these parameters was performed.Results. The results of the temporal and spectral analysis manifest the ocular microfluctuation that might be associated with breathing (manifested by 0.25 Hz peak in the power spectra), heart rate (1–1.5 Hz peak), and ocular hemodynamics (3.75–4.5 Hz peak).Conclusions. This paper shows that the optical coherence tomography can be used as a tool for noninvasive estimation of the ocular dynamics of the anterior segment of the eye, but its usability in diagnostics of the ocular hemodynamics needs further investigations.

scholarly journals Image sensor for spectral-domain optical coherence tomography on a chip

2020 ◽  
Vol 56 (24) ◽  
pp. 1306-1309
Author(s):  
M. Vlaskovic ◽  
H. Zimmermann ◽  
G. Meinhardt ◽  
J. Kraft
Keyword(s):  
Optical Coherence Tomography ◽  
Image Sensor ◽  
Spectral Domain ◽  
Optical Coherence

scholarly journals Structural and functional imaging of 3D microfluidic mixers using optical coherence tomography

2004 ◽  
Vol 101 (20) ◽  
pp. 7516-7521 ◽  
Author(s):  
C. Xi ◽  
D. L. Marks ◽  
D. S. Parikh ◽  
L. Raskin ◽  
S. A. Boppart
Keyword(s):  
Optical Coherence Tomography ◽  
Functional Imaging ◽  
Optical Coherence ◽  
Microfluidic Mixers

scholarly journals Temporal correlation of optical coherence tomography in-vivo images of rabbit airway for the diagnosis of edema

2014 ◽  
Author(s):  
DongYel Kang ◽  
Alex Wang ◽  
Tjoson Tjoa ◽  
Veronika Volgger ◽  
Ashley Hamamoto ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Temporal Correlation ◽  
Optical Coherence

scholarly journals Noise-bias and polarization-artifact corrected optical coherence tomography by maximum a-posteriori intensity estimation

2017 ◽  
Vol 8 (4) ◽  
pp. 2069 ◽  
Author(s):  
Aaron C. Chan ◽  
Young-Joo Hong ◽  
Shuichi Makita ◽  
Masahiro Miura ◽  
Yoshiaki Yasuno
Keyword(s):  
Optical Coherence Tomography ◽  
Maximum A Posteriori ◽  
Optical Coherence ◽  
A Posteriori ◽  
Intensity Estimation

scholarly journals Direct four-dimensional structural and functional imaging of cardiovascular dynamics in mouse embryos with 15  MHz optical coherence tomography

2015 ◽  
Vol 40 (20) ◽  
pp. 4791 ◽  
Author(s):  
Shang Wang ◽  
Manmohan Singh ◽  
Andrew L. Lopez ◽  
Chen Wu ◽  
Raksha Raghunathan ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Functional Imaging ◽  
Mouse Embryos ◽  
Optical Coherence ◽  
Cardiovascular Dynamics
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