Mr. Kensuke Oikawa Profile

Kensuke Oikawa

at Univ of Tsukuba

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Author

Publications (16)

Proceedings Article | 7 March 2022 Poster + Presentation + Paper

Motion-immune digital refocusing of point-scanning optical coherence tomography with Lissajous scan

Shuichi Makita, Lida Zhu, Kensuke Oikawa, Yoshiaki Yasuno

Proceedings Volume 11948, 119480F (2022) https://doi.org/10.1117/12.2609797

KEYWORDS: Optical coherence tomography, Aberration correction, In vivo imaging, Convolution, Signal processing, Tissues, Reconstruction algorithms

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Proceedings Article | 7 March 2022 Poster + Presentation + Paper

Multi-focus average for multiple scattering noise suppression in optical coherence tomography

Lida Zhu, Shuichi Makita, Antonia Litchtenegger, Junya Tamaoki, Kensuke Oikawa, Pradipta Mukherjee, Yiheng Lim, Makoto Kobayashi, Jiajie Luo, Yoshiaki Yasuno

Proceedings Volume 11948, 119480M (2022) https://doi.org/10.1117/12.2609190

KEYWORDS: Optical coherence tomography, Scattering, Multiple scattering, Tissues, Light scattering

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Proceedings Article | 7 March 2022 Presentation

Synthesizing degree of polarization uniformity from non-polarization sensitive OCT by convolutional neural network

Kensuke Oikawa, Shuichi Makita, Masahiro Miura, Takuya Iwasaki, Toshihiro Mino, Tatsuo Yamaguchi, Yoshiaki Yasuno

Proceedings Volume PC11941, PC1194109 (2022) https://doi.org/10.1117/12.2608395

KEYWORDS: Optical coherence tomography, Convolutional neural networks, Polarization, Evolutionary algorithms, Data acquisition

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Proceedings Article | 7 March 2022 Presentation

Depth-of-focus extended multi-contrast imaging by polarization-sensitive optical coherence tomography

Lida Zhu, Shuichi Makita, Daisuke Oida, Arata Miyazawa, Kensuke Oikawa, Pradipta Mukherjee, Antonia Lichtenegger, Martin Distel, Yoshiaki Yasuno

Proceedings Volume PC11963, PC119630I (2022) https://doi.org/10.1117/12.2609200

KEYWORDS: Tissues, Optical coherence tomography, Image resolution, Optical imaging, Birefringence, Scattering, Polarization, Collagen, 3D image processing

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Proceedings Article | 7 March 2022 Presentation

Quantitative scatterer density estimator to characterize tissue-based phantom in optical coherence tomography

Thitiya Seesan, Ibrahim El-Sadek, Pradipta Mukherjee, Kensuke Oikawa, Prathan Buranasiri, Yoshiaki Yasuno

Proceedings Volume PC11948, PC1194816 (2022) https://doi.org/10.1117/12.2612453

KEYWORDS: Optical coherence tomography, Image processing, Tissue optics, Statistical analysis, Speckle pattern, Speckle, Tumors, Speckle imaging, Spatial resolution, Scattering

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Proceedings Article | 2 March 2022 Presentation

Volumetric differential-phase imaging in scattering mode by optical coherence tomography

Kiriko Tomita, Daisuke Oida, Antonia Lichtenegger, Makoto Kobayashi, Junya Tamaoki, Lixuan Bian, Shuichi Makita, Kensuke Oikawa, Rion Morishita, Yoshiaki Yasuno

Proceedings Volume PC11972, PC119720O (2022) https://doi.org/10.1117/12.2608606

KEYWORDS: Optical coherence tomography, Light scattering, Scattering, Refractive index, Phase measurement, Tissue optics, Digital image correlation, Tissues, Phase contrast, Optical properties

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Proceedings Article | 9 December 2021 Paper

Multi-functional optical coherence microscopy for in-vitro and ex-vivo tissue investigation

Yoshiaki Yasuno, Ibrahim Abd El-Sadek, Arata Miyazawa, Larina Tzu-Wei Shen, Thitiya Seesan, Lida Zhu, Daisuke Oida, Kensuke Oikawa, Shuichi Makita, Shinichi Fukuda, Toshiharu Yamashita, Pradipta Mukherjee, Tetsuro Oshika, Prathan Branasiri, Satoshi Matsusaka

Proceedings Volume 11924, 119240H (2021) https://doi.org/10.1117/12.2616034

KEYWORDS: Tissues, Optical coherence tomography, Birefringence, Tumors, Tissue optics, Optical coherence microscopy, In vitro testing, Polarization, Liver, Visualization

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Proceedings Article | 8 March 2021 Presentation + Paper

Multi-contrast imaging with computational refocusing in polarization-sensitive optical coherence tomography

Lida Zhu, Shuichi Makita, Daisuke Oida, Arata Miyazawa, Kensuke Oikawa, Pradipta Mukherjee, Yoshiaki Yasuno

Proceedings Volume 11630, 1163020 (2021) https://doi.org/10.1117/12.2582764

KEYWORDS: Optical coherence tomography, Birefringence, Polarization, Tissues, Silicon, Resolution enhancement technologies, Image resolution, Foam, Biological research, 3D image processing

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Optical coherence tomography (OCT) has been widely used for imaging biological sample due to its capability of three-dimensional (3-D) reconstruction. Recently, polarization-sensitive optical coherence tomography (PSOCT) has been used to investigate polarization properties of samples such as retina and muscle [1,2]. Such extensions provide additional contrasts other than traditional reflected intensity and offer a 3-D multi-functional reconstruction of materials and biological tissue. PS-OCT uses A-scan wise computation to obtain the polarization properties from a set of OCT images. In this computation, the lateral resolution is implicitly assumed as infinitely high. However, the birefringence measurement itself will be affected by the lateral optical resolution, defocus, and aberrations. One simple way to obtain high-resolution birefringent data is to use an objective with higher NA. However, OCT also suffers from the trade-off between the lateral resolution and the depth-of-focus (DOF), which might limit its application in thick samples. There have been various methods to overcome this issue. Hardware solutions such as mechanical depth scanning [3] have been reported, but the additional configurations would increase the complexity of system. On the other hand, computational methods do not require additional hardware set-up and thus can be easily adopted, such as interferometric synthetic aperture microscopy (ISAM) [4] and forward model based computational refocusing [5]. However, to our acknowledgement, there are only few reports of long imaging depth for 3-D birefringence imaging. One presented work combined the ISAM with PS-OCT [6]. But the impact of refocusing on multi-contrast imaging, such as artifact in birefringence measurement, has not been thoroughly investigated. In this paper, we present a DOF extended polarization-sensitive imaging by applying computational refocusing to Jones-matrix based PS-OCT (JM-OCT). Computational refocusing is applied to each of four polarization channels (images) of JM-OCT, and the birefringence and degree-of-polarization-uniformity (DOPU) images are computed from the refocused OCT images. Enhanced lateral resolution away from the focus plane and hence extended DOF are demonstrated through phantom and ex vivo porcine muscle measurements. The ex vivo porcine muscle measurement also suggests that the refocusing may reduce the birefringence artifacts.

Proceedings Article | 5 March 2021 Poster + Presentation + Paper

Sample and system parameter estimation from local speckle pattern by fully numerically trained deep convolution neural network

T. Seesan, D. Oida, K. Oikawa, P. Buranasiri, Y. Yasuno

Proceedings Volume 11630, 1163021 (2021) https://doi.org/10.1117/12.2578012

KEYWORDS: Optical coherence tomography, Statistical analysis, Speckle pattern, Image processing, Neural networks, Convolution, Speckle, Speckle imaging, Spatial resolution, Numerical simulations

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Proceedings Article | 5 March 2021 Presentation

Computational multi-directional optical coherence tomography for visualizing the microstructural directionality of the tissue

Daisuke Oida, Kensuke Oikawa, Tai-Ang Wang, Meng-Tsan Tsai, Shuichi Makita, Yoshiaki Yasuno

Proceedings Volume 11630, 116301C (2021) https://doi.org/10.1117/12.2577970

KEYWORDS: Optical coherence tomography, Signal processing, Visualization, Tissue optics, Tissues, Spatial frequencies, Turbulence, Statistical analysis, Breast

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Proceedings Article | 5 March 2021 Presentation

Bulk phase error correction by smart-integration-path method for phase-sensitive signal processing of optical coherence tomography

Kensuke Oikawa, Daisuke Oida, Shuichi Makita, Yoshiaki Yasuno

Proceedings Volume 11630, 116301H (2021) https://doi.org/10.1117/12.2577484

KEYWORDS: Optical coherence tomography, Signal processing, Image quality, Phase measurement, Tomography, Spatial frequencies, Environmental sensing, Aberration correction

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Proceedings Article | 15 June 2020 Paper

Bulk phase error correction for holographic signal processing of optical coherence tomography

Kensuke Oikawa, Shuichi Makita, Daisuke Oida, Yoshiaki Yasuno

Proceedings Volume 11521, 115210P (2020) https://doi.org/10.1117/12.2573231

KEYWORDS: Optical coherence tomography, Error analysis, Holography, Signal processing, Image processing, Image quality, Breast, Computational imaging, Numerical analysis, Deconvolution

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Proceedings Article | 15 June 2020 Paper

Intensity-invariant scatterer density estimation for optical coherence tomography using deep convolutional neural network

Thitiya Seesan, Daisuke Oida, Kensuke Oikawa, Prathan Buranasiri, Yoshiaki Yasuno

Proceedings Volume 11521, 115210Q (2020) https://doi.org/10.1117/12.2573236

KEYWORDS: Optical coherence tomography, Speckle, Signal to noise ratio, Convolutional neural networks, Speckle pattern, Laser beam diagnostics, Biological research, Optical resolution, Point spread functions, Image resolution

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Proceedings Article | 15 June 2020 Paper

Numerical jitter estimation for swept source optical coherence tomography

Lida Zhu, Arata Miyazawa, Pradipta Mukherjee, Ibrahim Abd El-Sadek, Kensuke Oikawa, Daisuke Oida, Yoshiaki Yasuno

Proceedings Volume 11521, 115210T (2020) https://doi.org/10.1117/12.2573281

KEYWORDS: Optical coherence tomography, Holography, Polarization, 3D metrology, 3D acquisition, Algorithm development, Computational imaging, Computing systems, Biological research, Volume holography

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Proceedings Article | 15 June 2020 Paper

Bulk phase error correction for holographic signal processing of optical coherence tomography

Kensuke Oikawa, Shuichi Makita, Daisuke Oida, Yoshiaki Yasuno

Proceedings Volume 11521, 115210P (2020) https://doi.org/10.1117/12.2573231

KEYWORDS: Optical coherence tomography, Error analysis, Holography, Signal processing, Image processing, Image quality, Breast, Computational imaging, Numerical analysis, Deconvolution

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Proceedings Article | 21 February 2020 Presentation + Paper

Virtual multi-directional optical coherence tomography

Daisuke Oida, Kensuke Oikawa, Tai-Ang Wang, Meng-Tsan Tsai, Shuichi Makita, Yoshiaki Yasuno

Proceedings Volume 11228, 112281G (2020) https://doi.org/10.1117/12.2548902

KEYWORDS: Optical coherence tomography, Visualization, Tissues, Tissue optics, Spatial frequencies, Optical coherence microscopy

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Showing 5 of 16 publications

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