Evaluation of the radiation dose from the diagnostic and topometric procedures in radiation therapy

摘要

The purpose of this work were to evaluate the additional dose contribution from the diagnostic and topometric procedures into the total radiation dose in a commercial treatment planning system. By means of thermoluminescent dosimetric and ionization chambers-based methods the radiation doses from CT examination and the procedures used for topometric preparation of the patient to radiotherapy were measured in 17 organs of the anthropomorphic phantom. It was obtained that relative contribution of additional dose from CT examination and simulation is very small and of the order of 1%. However, including the imaging dose at the time of treatment planning would allow for a better prediction of the total dose to tumor and critical organs.