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Uveal iridophoroma in a betta fish (Betta splendens).
J Comp Pathol
November 2024
Veterinary Pathology Services, Joint Pathology Center, Stephen Sitter Avenue, Silver Spring, Maryland 20910-1290, USA. Electronic address:
Chromatophoromas are neoplasms arising from pigment cells in vertebrates. Iridophoromas are a type of chromatophoroma that are reported in several teleost species. There are multiple case reports of this diagnosis in betta fish (Betta splendens), but all previously reported cases originated from the skin.
View Article and Find Full Text PDFPolarization-insensitive optical coherence tomography using pseudo-depolarized reference light for mitigating birefringence-related image artifacts.
J Biomed Opt
November 2024
Medical University of Vienna, Center for Medical Physics and Biomedical Engineering, Vienna, Austria.
Significance: Optical coherence tomography (OCT) images are prone to image artifacts due to the birefringence of the sample or the optical system when a polarized light source is used for imaging. These artifacts can lead to degraded image quality and diagnostic information.
Aim: We aim to mitigate these birefringence-related artifacts in OCT images by adding a depolarizer module in the reference arm of the interferometer.
Examination of flow birefringence induced by the shear components along the optical axis using a parallel-plate-type rheometer.
Sci Rep
September 2024
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan.
In this study, the concept of rheo-optics was applied to explore the flow birefringence induced by the stress components along the camera's optical axis since it is often overlooked in the traditional theories of photoelastic flow measurement. A novel aspect of this research is that it involved conducting polarization measurements on simple shear flows, specifically from a perspective in which a shear-velocity gradient exists along the camera's optical axis. A parallel-plate-type rheometer and a polarization camera are employed for these systematic measurements.
View Article and Find Full Text PDFSnapshot Multi-Wavelength Birefringence Imaging.
Sensors (Basel)
August 2024
Engineering and Technology Research Center of Shanxi Province for Opto-Electric Information and Instrument, North University of China, Taiyuan 030051, China.
A snapshot multi-wavelength birefringence imaging measurement method was proposed in this study. The RGB-LEDs at wavelengths 463 nm, 533 nm, and 629 nm were illuminated with circularly polarized light after passing through a circular polarizer. The transmitted light through the birefringent sample was captured by a color polarization camera.
View Article and Find Full Text PDFWe report on the new application, to the best of our knowledge, of a time-domain optical coherence tomography (TD-OCT) device used to measure the ordinary and extraordinary indices of calcite birefringence crystal at room temperature. A 1.25±0.
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