THE EFFECT OF TUBE CURRENT AND ASIR-V LEVEL ON SPATIAL RESOLUTION WITH MODULATION TRANSFER FUNCTION (MTF) METHOD ON AAPM CT PERFORMANCE PHANTOM

• Main Author: Stevania Pratami, Clarissa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83530
• Institution: Institut Teknologi Bandung

Computed Tomography (CT) scans are crucial medical tools for diagnosing abnormalities in the human body, making image quality essential for optimal diagnostic outcomes. Spatial resolution is one of the factors affecting image quality, and the Modulation Transfer Function (MTF) is a method used to determine spatial resolution. This study aims to analyze the impact of tube current and ASiR-V levels on the Modulation Transfer Function (MTF) values in CT scan image quality, and to compare the MTF values obtained from two calculation algorithms: IndoQCT and Matlab. The image data used include the spatial resolution section of the AAPM CT Performance Phantom, with tube currents of 300, 350, and 400 mAs and ASiRV levels of 0%, 20%, 60%, and 100%. MTF calculations using IndoQCT were performed automatically, while the calculations using Matlab were performed using plot profiles from image data in ImageJ. The ROI position was placed on the longitudinal steel wire in the spatial resolution section of the phantom. After obtaining MTF values from IndoQCT and Matlab, the MTF 10% for each variation was determined. The results show that the MTF 10% obtained with IndoQCT tends to increase at higher tube currents, while the results from Matlab tend to decrease. ASiR-V levels did not affect the MTF 10% values. The calculation algorithm impacts the MTF results, with the MTF 10% values from Matlab being higher than those from IndoQCT. All MTF 10% results met the BAPETEN standards (MTF 10% ? 0.5 lp/mm), indicating that the CT scan used meets quality standards for optimal use.