[Photon transport in pelvic radiotherapy for cervical cancer]

At present clinical treatment of cervical cancer combines surgical intervention, radiotherapy and chemotherapy. Optimal doses in radiotherapy help improve survival of the patients, but the decision on such dose has to originate from direct measurement. Due to the complexity in the anatomic structure of female pelvic cavity and the adjacent tissues, quite an array of measurement equipments, experimental techniques and radiation parameters have to be employed or determined during radiation measurements, which adds to the complexity of measurement as well as the costs. In this article, the author introduces random photon tracing simulation method to compute tissue photon flux during pelvic radiotherapy for cervical cancer. Besides the simplicity, flexibility and accuracy, this method also lessens the influences by the conditions of and is well adapted to complicated structure of the female pelvic cavity, drastic changes in tissue parameters, and anisotropic scattering.