Avaliação da qualidade da imagem do equipamento de mamografia no Hospital Central de Maputo (HCM)

Abstract

2 217 / 5 000 Mammography is currently the main technique for screening breast pathology, and for the best use of it must be to have the equipment operating in the best conditions. Therefore, in order to have guarantee that the equipment is operating in the best conditions, control of quality (daily, monthly, semi-annual and annual). Quality control is a set of planned actions and systematic measures that aim to ensure that the service operates according to the standards recommended by the body regulator (ANEA) that regulates the process, through measures, operation and quality, maintaining a high standard of care, offering radiological protection to the patient, the worker and the public. The main objective of this work was to evaluate the image quality of the equipment. of Mammography at HCM, in the Diagnostic Radiology service. To carry out the studies it was used a quality control equipment kit, provided by ANEA, a mammogram HCM with a ready-made image acquisition system and a recommended test suite by the IAEA or the European Commission, where it was possible to carry out 8 tests from which the following were obtained: following main results: 9.804 and 0.018 for accuracy and reproducibility of exposure time respectively; 190N and 200N for Compression Force; 0.00821 and 2.61 for Accuracy and reproducibility of tube voltage respectively; 0.48 for the semi-reducing layer; 8.43 and 6.31 for Skin Entry Dose; 2.82 and 2.11 for mean Glandular Dose; 3.45 for Reproducibility and 3.45 for linearity of air kerma rate and; for image quality we had 4 for mass, 3.5 for microcalcifications and 5 for fibers in a thickness of 4.5 cm, therefore the results obtained can it is found that the mammography equipment is operating under the best conditions established by IAEA, but it can also be verified that for a thickness above 7.5 cm the quality of image decreases which can make it difficult to diagnose breast pathology, if this is the case The radiologist may direct the patient to other mammography-assisting equipment such as such as Breast Ultrasound, Breast MRI or Breast Tomosynthesis.