High-speed imaging of remotely induced shear waves using phase-sensitive optical coherence tomography

2015 ◽  
Author(s):  
Shaozhen Song ◽  
Nhan Minh Le ◽  
Zhihong Huang ◽  
Ruikang K. Wang
Keyword(s):  
Optical Coherence Tomography ◽  
High Speed ◽  
Shear Waves ◽  
Optical Coherence ◽  
High Speed Imaging ◽  
Phase Sensitive

scholarly journals Design and Optimization of a Linear Wavenumber Spectrometer with Cylindrical Optics for Line Scanning Optical Coherence Tomography

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6463
Author(s):  
Sevin Samadi ◽  
Javad Dargahi ◽  
Sivakumar Narayanswamy
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
High Speed ◽  
High Efficiency ◽  
Optical Design ◽  
Optical Coherence ◽  
High Speed Imaging ◽  
Nonlinearity Error ◽  
Line Scanning

We report the design of a high-efficiency spectral-domain spectrometer with cylindrical optics for line scanning optical coherence tomography (OCT). The spectral nonlinearity in k space (wavenumber) lowers the depth-dependent signal sensitivity of the spectrometers. For linearizing, in this design, grating and prism have been introduced. For line scanning, a cylindrical mirror is utilized in the scanning part. Line scanning improves the speed of imaging compared to fly-spot scanning. Line scanning OCT requires a spectrometer that utilizes cylindrical optics. In this work, an optical design of a linear wavenumber spectrometer with cylindrical optics is introduced. While there are many works using grating and prism to linearize the K space spectrometer design, there is no work on linearizing the k-space spectrometer with cylindrical optics for line scanning that provides high sensitivity and high-speed imaging without the need for resampling. The design of the spectrometer was achieved through MATLAB and ZEMAX simulations. The spectrometer design is optimized for the broadband light source with a center wavelength of 830 ± 100 nm (8.607 μm−1− 6.756 μm−1 in k-space). The variation in the output angle with respect to the wavenumber can be mentioned as a nonlinearity error. From our design results, it is observed that the nonlinearity error reduced from 147.0115 to 0.0149 Δθ*μm within the wavenumber range considered. The use of the proposed reflective optics for focusing reduces the chromatic aberration and increases image quality (measured by the Strehl ratio (SR)). The complete system will provide clinicians a powerful tool for real-time diagnosis, treatment, and guidance in surgery with high image quality for in-vivo applications.

scholarly journals High-speed imaging of human retina in vivo with swept-source optical coherence tomography

2006 ◽  
Vol 14 (26) ◽  
pp. 12902 ◽  
Author(s):  
H. Lim ◽  
M. Mujat ◽  
C. Kerbage ◽  
E. C. W. Lee ◽  
Y. Chen ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Speed ◽  
Human Retina ◽  
Optical Coherence ◽  
High Speed Imaging ◽  
Swept Source

scholarly journals High-speed spectral calibration by complex FIR filter in phase-sensitive optical coherence tomography

2016 ◽  
Vol 7 (4) ◽  
pp. 1430 ◽  
Author(s):  
Sangmin Kim ◽  
Patrick D. Raphael ◽  
John S. Oghalai ◽  
Brian E. Applegate
Keyword(s):  
Optical Coherence Tomography ◽  
High Speed ◽  
Fir Filter ◽  
Optical Coherence ◽  
Spectral Calibration ◽  
Phase Sensitive

scholarly journals Study on cerebral vascular image of spectral domain optical coherence tomography with compressive sensing

2013 ◽  
Vol 11 (3) ◽  
pp. 2355-2359
Author(s):  
Ping Xu ◽  
Zhaoyang Jin ◽  
Yong Yang
Keyword(s):  
Optical Coherence Tomography ◽  
Compressed Sensing ◽  
High Speed ◽  
Signal To Noise Ratio ◽  
Spectral Domain ◽  
Optical Coherence ◽  
L1 Norm ◽  
High Speed Imaging ◽  
Sd Oct ◽  
Cerebral Vascular

We propose a novel compressed sensing method to retrieve cerebral vascular image for spectral-domain optical coherence tomography (SD OCT). The compressed sensing method based on l1 norm minimization is applied to reconstruct each A-scan data. The proposed method uses about 25% of the total data as required in traditional SD OCT to reconstruct the cerebral angiograpy. Therefore this method is favorable for high speed imaging for cerebral angiograpy. It is shown that the proposed method can achieve better performance of axial resolution and higher signal-to-noise ratio (SNR) as compared with the conventional methods.

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