Optical properties of tissue, experimental results

Johan F. Beek

doi:10.1117/12.2283757

5 August 1993 Optical properties of tissue, experimental results

Johan F. Beek

Proceedings Volume 10311, Medical Optical Tomography: Functional Imaging and Monitoring; 103110C (1993) https://doi.org/10.1117/12.2283757
Event: Medical Optical Tomography: Functional Imaging and Monitoring, 1993, Bellingham, WA, United States

Abstract

The effective attenuation coefficient of piglet lung was measured in vitro at 632.8 nm. Interstial fibres with isotropic tips were used to measure the fluence rate as a function of the distance from an isotropic light source. In vitro measurements at 632.8 nm on a lung that was insufflated with oxygen from 50 to 150 ml showed that the effective attenuation coefficient decreases as a function of the volume of air in the lung (at 50 ml /Jeff = 0.297 + 0.011 mnf1, at 100 ml lice 0.150 ± 0.007 mm-1, and at 150 ml /Jeff= 0.1136 + 0.015 mm-1). A single in vitro measurement at 790 nm at an insufflated lung volume of 100 ml gave a comparable result (ii ie = 0.175 + 0.004 mm-1). A ff decrease in effective attenuation coefficient with an ncrease in lung volume was explained by Mie-theory. The effective attenuation coefficient, calculated with 11, and g from Mie-theory, showed a deviation < 22% from the measured in vitro values.

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Johan F. Beek "Optical properties of tissue, experimental results", Proc. SPIE 10311, Medical Optical Tomography: Functional Imaging and Monitoring, 103110C (5 August 1993); https://doi.org/10.1117/12.2283757

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