A COMMENT ON SPECTRAL TRANSMITTANCE IN MAMMALIAN SKELETAL MUSCLE

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Abstract
Spectral transmittance studies, related to photoradiation therapy light dosage, were carried out in vitro on mammalian skeletal muscle with expanded beam, broad band, white light (420‐1100 nm). Spectra were collected by an EG&G 550/555 spectroradiometer with a 550‐2A silicon detector. Bovine striated muscle imposes heavy absorption and distinct spectral structure, reflecting tissue absorption maxima at short wavelengths. Transmission above 650 nm is improved by a 10' factor, relative to blue light, in 1 cm of muscle. Half value layers were 0.82 mm in the 630 nm region, and were sensitive to tissue composition. Bovine muscle exhibited spectral effects related to the cadaver studies done by Wan et at. (1981b) but show singular differences, due primarily to complex tissue composition encountered in cadaver wall measurements, as contrasted with simple muscle. Spectral transmittance is a function of wavelength, tissue type and thickness.

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