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Journal of Biomedical Optics

Quantitative second harmonic generation imaging and modeling of the optical clearing mechanism in striated muscle and tendon
Author(s): Ronald LaComb; Oleg Nadiarnykh; Shawn Carey; Paul J. Campagnola
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Paper Abstract

We have investigated the mechanisms and capabilities of optical clearing in conjunction with second harmonic generation (SHG) imaging in tendon and striated muscle. Our approach combines three-dimensional (3-D) SHG imaging of the axial attenuation and directional response with Monte Carlo simulation (based on measured bulk optical properties) of the creation intensity and propagation through the tissues. Through these experiments and simulations, we show that reduction of the primary filter following glycerol treatment dominates the axial attenuation response in both muscle and tendon. However, these disparate tissue types are shown to clear through different mechanisms of the glycerol-tissue interaction. In the acellular tendon, glycerol application reduces scattering by both index matching as well as increasing the interfibril separation. This results in an overall enhancement of the 3-D SHG intensity, where good agreement is found between experiment and simulation. Through analysis of the axial response as a function of glycerol concentration in striated muscle, we conclude that the mechanism in this tissue arises from matching of the refractive index of the cytoplasm of the muscle cells with that of the surrounding higher-index collagenous perimysium. We further show that the proportional decrease in the scattering coefficient μs with increasing glycerol fraction can be well-approximated by Mie theory.

Paper Details

Date Published: 1 March 2008
PDF: 11 pages
J. Biomed. Opt. 13(2) 021109 doi: 10.1117/1.2907207
Published in: Journal of Biomedical Optics Volume 13, Issue 2
Show Author Affiliations
Ronald LaComb, Univ. of Connecticut Health Ctr. (United States)
Oleg Nadiarnykh, Univ. of Connecticut Health Ctr. (United States)
Shawn Carey, Worcester Polytechnic Institute (United States)
Paul J. Campagnola, Univ. of Connecticut Health Ctr. (United States)

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