차트 각도를 이용한 해상력 특성 평가

Evaluation of Resolution Characteristics by Using Chart Device Angle

This study aim was quantitative assessment of MTFs of spectrum of the square wave chart images and Coltman chart images for 0o, 1.7o, 2.2o, 2.9o, 4.1o by using chart method. In general device was AccuRay-650 (DK Medical System, Korea) used, indirect flat panel detector(FPD) Aero (Konica, Japan) used and MATLAB R2019a (MathWorks, USA) used. The result of comparison for each angle of MTF the edge image was highest quantitatively value for MTF finding of showed the best value of 0.1 based on the frequency of 3.5 mm-1, value of 0.1 based on the square wave was frequency of 3.0 mm-1 and value of 0.1 based on the Coltman transform was frequency of 2.4 mm-1. In this study it was significant that the methodology of the international Electro-technical Commission was applied mutandis by using the Fujita method within 2∼3o.