Controle de qualidade dos monitores de exibição primários e salas de laudo médico

Abstract

Several factors can affect image quality, making it unsuitable for diagnostic purposes, such as contrast, noise, luminance and distortions. Therefore, a medical interpretation monitor, defined as the primary display monitor, must have specific performance, enabling an accurate diagnosis from the doctor to the patient. Considering the quality assurance required in diagnostic imaging as well as the mandatory Quality Control (QC) tests for primary display monitors and reporting rooms, this study evaluated 40 primary display monitors and 07 reporting rooms used in routine of a medical report from a large university hospital, located in the city of Curitiba-PR. The evaluations were carried out according to the luminance uniformity, monitor luminance and report room illuminance parameters provided by the Brazilian Normative Instructions (Ins) n.ᵒˢ 90 (IN 90), 92 (IN 92), 93 (IN 93) and 97 (IN 97) published by the National Health Surveillance Agency (ANVISA) in 2021 and also by the ratio tolerances between the maximum and minimum luminance, the GSDF Standard (Grayscale Standard Display Function) and the difference in luminance between the monitors of the same workstations defined by the Quality Control Protocols for Radiodiagnosis in Latin America and the Caribbean published by the International Atomic Energy Agency (IAEA) in 2021, as well as , Report nº 270 of the American Association of Physicists in Medicine (AAPM) published in 2019 as a methodological basis for carrying out the tests. All 40 primary monitors were compliant for tests of luminance uniformity, monitor luminance and ratio between maximum and minimum luminance according to tolerance criteria established by current national legislation and by the IAEA. As for the luminance difference test between the monitors of the same workstation, a set of monitors showed non-compliance, and, for the GSDF Standard test, 04 monitors showed non-conformities at measured points, both non-conformities were evaluated according to the established tolerances by the IAEA. For the illuminance test in the report room, all 07 rooms showed adequate values according to the national criteria of the Ins.