Photon Interaction Coefficients for the Colorectal Cancer Tissue.

Purpose: The application of radiotherapy to the treatment of cancer requires the knowledge of photon interaction coefficients such as mass attenuation (μ) and mass energy-absorption coefficients (μ/ρ). Although these coefficients have been determined for different tissues, it is lacking for the colorectal cancer (CRC) tissue in the literature. This study determines the μ and μ/ρ for the CRC tissue within the radiotherapy energy range.