[Use of computed tomography for planning intracavitary radiotherapy of cervical cancer]

CT potentialities for irradiation planning have been demonstrated as a result of a study of 20 cervical cancer patients, Stages I-II, using a computerized tomograph for topometric preparation for intracavitary therapy with afterloading units, and subsequent gamma-beam therapy. Complete information on sections that are necessary for clinicodosimetric irradiation planning, has been obtained with the help of digital radiography, transversal tomography and mathematical reconstruction of secondary sections. The study was performed by inserting a centering mount and metrocolpostat after a preliminary determination of A point on the simulator. An effect of the degree of the bladder filling on the organs located in a given section has been shown. It has been established that the degree of the bladder filling at the level of A and B points does not influence a distance from its posterior wall to the metrostat. It is assumed that intestinal radiation injuries can be prevented by controlling the degree of the bladder filling.