Abstract
Determination of in-vivo tissue optical properties for anal photodynamic therapy (PDT) is challenging due to the light integrating-sphere effect in an enclosed cylindrical cavity. We developed a model for optical properties determination for anal PDT from measurements of light fluence rate inside a cylindrical cavity submerged in tissue-mimicking liquid phantoms. Measurements are performed in a set of phantoms with known optical properties (μ<sub>a</sub> = 0.1-0.9 cm<sup>-1</sup>) and (μ<sub>s</sub>’ = 5.5-16.5 cm<sup>-1</sup>) and the primary and scatter light fluence rates are determined. We developed a forward empirical model to relate scatter light fluence rate measured in an enclosed cylindrical geometry to the surrounding tissue optical properties in tissue-simulating liquid phantoms.
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