QUALITY CONTROL CT SCAN (ANALISIS DAN EVALUASI KUALITAS CITRA)

Abstract

Producing high-quality CT scans is crucial for accurately interpreting images and obtaining maximum diagnostic information. However, it usually comes at the cost of increased radiation exposure for the patient. Therefore, it's essential to evaluate CT scan image quality to ensure that it provides maximum information for diagnostic purposes while keeping the radiation dose received by the patient as low as possible. Several parameters can be used to evaluate the quality of CT scan images, such as accuracy, linearity, uniformity of the CT number, and high contrast resolution (spatial resolution). A phantom scan is carried out routinely once a week to test the quality of CT scan images. In this study, the image quality phantom was scanned using a Philips MX Evo 16 slice CT Scan over three months, which resulted in twelve CT scan image quality phantom image scan data. The CT scan data was processed and analyzed automatically using the IndoQCT application to determine the image quality. The value obtained was then compared with the test pass value stipulated in the Regulation of the Nuclear Energy Regulatory Agency (BAPETEN) Number 2 of 2018 concerning Compliance Tests for Diagnostic and Interventional Radiology X-ray. The average CT number accuracy value obtained was 0.6 HU, with a maximum value of 0.9 HU and a minimum value of 0.2 HU. The average CT number uniformity value obtained was 0.55 HU with a maximum value of 0.8 HU. The average CT number linearity value obtained was 0.9957 HU with a minimum of 0.9956. Meanwhile, the average MTF value obtained was 0.65, with a maximum value of 0.72. This study concludes that the values obtained still meet the CT Scan image quality test set by BAPETEN. Therefore, the CT Scan can still be considered reliable and used for service. Keywords: CT Scan, image quality, CT number, spatial resolution, IndoQCT.