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- W2290611403 abstract "Second harmonic generation SHG and two-photon fluo- rescence TPF microscopy is used to image the intercellular and peri- cellular matrix in normal and degenerate equine articular cartilage. The polarization sensitivity of SHG can be used directly to determine fiber orientation in the superficial 10 to 20 m of tissue, and images of the ratio of intensities taken with two orthogonal polarization states reveal small scale variations in the collagen fiber organization that have not previously been reported. The signal from greater depths is influenced by the birefringence and biattenuance of the overlying tis- sue. An assessment of these effects is developed, based on the analysis of changes in TPF polarization with depth, and the approach is vali- dated in tendon where composition is independent of depth. The analysis places an upper bound on the biattenuance of tendon of 2.6510 4 . Normal cartilage reveals a consistent pattern of variation in fibril orientation with depth. In lesions, the pattern is severely dis- rupted and there are changes in the pericellular matrix, even at the periphery where the tissue appears microscopically normal. Quantifi- cation of polarization sensitivity changes with depth in cartilage will require detailed numerical models, but in the meantime, multiphoton microscopy provides sensitive indications of matrix changes in carti- lage degeneration. © 2008 Society of Photo-Optical Instrumentation Engineers. DOI: 10.1117/1.2950318" @default.
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- W2290611403 date "2008-01-01" @default.
- W2290611403 modified "2023-09-24" @default.
- W2290611403 title "PROOF COPY 007804JBO Collagen fiber arrangement in normal and diseased cartilage studied by polarization sensitive nonlinear microscopy" @default.
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