Here we release five short presentation videos about our multi-contrast OCT microscope.
"Label-free imaging of mouse liver dynamics" by Pradipta Mukherjee
"Tissue dynamics imaging of tumor spheroid" by Ibrahim Abd El-Sadek
"Computational directional OCT imaging" by Daisuke Oida
"Polarization sensitive OCT microscope with computational refocusing" by Lida Zhu
"Tissue scatterer density estimation by deep learning" by Thitiya Seesan
The videos are available on this YouTube Play list or the embedded video screen below. (You can select each presentation by the playlist, while all videos are played in a sequence at the embedded video screen.) Enjoy!
Our colleague Ibrahim Abd El-Sadek recently published his new technology "dynamics optical coherence tomography OCT imaging." In this study, he demonstrated new imaging method, which is a combination of new imaging protocol of OCT and a newly developed signal processing method.
By using this method, he successfully visualized the tissue activity of human cancer culture (MCF7 spheroid) totally non-invasively. This method also successfully visualized the anti-cancer drug response of the MCF7 spheroid.
The details are reported in Biomedical Optics Express, a journal of Optical Society of America.
私達の研究室の博士課程在学中の Ibrahim Abd El-Sadek さんが組織ダイナミクスイメージングに関する論文を発表しました。この研究で Ibrahim さんは新たに「組織の活動性を非侵襲・ラベルフリーにイメージングする手法」を開発しました。これは、OCTの新しい走査法とOCT信号の時間ゆらぎを解析する新しい信号処理手法の組み合わせによって実現されています。
Citation: I.A. El-Sadek, A. Miyazawa, L.T.W.Shen, S. Makita, S. Fukuda, T. Yamashita, Y. Oka, P. Mukherjee, S. Matsusaka, T. Oshika, H. Kano, and Y. Yasuno, "Optical coherence tomography-based tissue dynamics imaging for longitudinal and drug response evaluation of tumor spheroids," Biomedical Optics Express11, 6231- (2020).
Our colleague Kensuke Oikawa recently reported a newly developed numerical method for volumetric phase stabilization of optical coherence microscopy (OCM) in Biomedical Optics Express.
In this study, Kensuke developed a new method to estimate the volumetric phase error (bulk phase error) of OCM, and also developed a method to correct this error. This method enabled highly accurate holographic processing of OCT.
By using this method, he demonstrated holographic refocusing of volumetric OCM of muscle samples. Owing to this methods, the fine muscle fiber structure was visualized over more than 600-um depth.
The details of the research is reported in Biomedical Optics Express.
K. Oikawa, D. Oida, S. Makita, Y. Yasuno, "Bulk-phase-error correction for phase-sensitive signal processing of optical coherence tomography," Biomedical Optics Express11, 5886- (2020).
Our collaborator Hiroyuki Ichikawa from Ehime University and we jointly reported the numerical analysis of signal property of polarization sensitive optical coherence tomography (PS-OCT).
In this study, we used finite-difference time-domain (FDTD) method to analyze the OCT probe beam's propagation property in a periodic structure. By this analysis, we found an artificial signal peak is generated as the OCT's probe beam passing through a grating structure.
This method will be used to interpret PS-OCT signals and to relate it to sample structures.
The details of the research is reported in OSA Continuum.
H. Ichikawa, Y. Yasuno, and H. Fujibuchi, "Optical coherence tomography interpreted by diffractive optics: A-scan image formation with wavelength-scale diffraction gratings as samples," OSA Continuum3, 2395- (2020).