Implementação de um programa da garantia de qualidade em tomógrafos simuladores dedicados à radioterapia

Abstract

The most used technique for the acquisition of images used for the planning of treatment in radiotherapy is computed tomography. The images are used for the design of the target and risk volumes. Quality control of the radiotherapy tomograph is required to ensure that the simulation of patient positioning on the treatment table and 3D reconstruction of the patient's anatomy is being performed within the acceptance limit. This work aims to implement a quality assurance program in the CT simulator of the University Cancer Control Center - CUCC/UERJ. Based on international protocols the tests were divided as to type in: mechanical, geometric, image-related and X-ray generator tube. As for the periodicity, they were divided into: daily, monthly and annual. The American College of Radiolody (ACR) accreditation phantom was used to perform the tests and in addition a study was conducted with the phantom of the Cancer Foundation. Acceptance of the CT simulator was performed to establish the reference values. The CT calibration curve was built on CAT3D, including high density materials such as aluminum and titanium. The results showed that the tomograph is in operative condition for radiotherapy and that some components require maintenance. Spreadsheets and methodology for periodic quality control were proposed. Thus, it can be concluded that the implementation of the quality assurance program was carried out and that the proposed tests meet the objectives.