Estudo e implementação de testes de controle de qualidade em negatoscópios na cidade de Aracaju-SE

Abstract

Taking into account the requirement of current legislation in Brazil, Decree 453/98, the Ministry of Health and several subtle nature of radiographic findings, it is important to know how the detectability of objects with lower density or smaller can be influenced by the intensity of light light box used in his lectures. Thus, this project aimed to establish a program for implementing the quality assurance of radiographic imaging in hospitals from public and private city of Aracaju-SE, checking the conditions of the viewing box luminance used in these hospitals alter the detectability of simulated objects. For this we built a prototype statistical phantom breast low-cost after taking into consideration the best materials for their composition. Another commercial simulator was also used. The prototype has favored a random distribution of simulated objects, allowing a statistical evaluation of the detectability of each type of simulated structure, thus avoiding the likelihood of systematic errors in the evaluation of images, as frequently occurs with the simulators with fixed structures. Were performed mammographic images of breast phantom 300 in various technical conditions, once this work had made the internal structures with large dimensions for the test to be performed. These images were analyzed by specialists in breast radiology in negatoscopes the general type and specific. The results were compared using the test and chi-square showed that the simulated objects were small negatoscopes best viewed on the specific type. The luminance of the viewing box was also evaluated and the results show that only 38.5% of the general type negatoscopes meet international demands to minimum luminance. In this work, it is recommended that the test for detection is implemented in routine radiology centers in the Program for Quality Control of the viewing box.