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Evaluation of the Spatial Resolution for Exposure Class in Computed Radiography by Using the Modulation Transfer Function

변조전달함수를 이용한 컴퓨터 방사선영상의 감도 노출 분류에 따른 공간분해능 평가

  • 성열훈 (청주대학교 방사선학과)
  • Received : 2013.06.19
  • Accepted : 2013.08.20
  • Published : 2013.08.28

Abstract

The purpose of the study was to present basic data to evaluation of the spatial resolution for exposure class(EC) in computed radiography(CR) by using the modulation transfer function(MTF). In this study, MTF was measured the edge method by using image plate(IP) of $100{\mu}mm$ pixels. A standard beam quality RQA5 based on an international electro-technical commission(IEC) standard was used to perform the X-ray imaging studies. Digital imaging began to set the sensitivity to EC 50, 100, 200, 300, 400, 600, 800, 1200 in X-ray irradiated to IP. The MTF 50% and 10% in the final images was analysis by using an authorized image analysis program the Origin 8.0 and the image J. As a results, the EC 200 was the best spatial resolution at MTF 50% ($1.979{\pm}0.114lp/mm$) and MTF 10% ($3.932{\pm}0.041$). Therefore, the EC 200 could be useful for the diagnosis of diseases that require high spatial resolution such as fractures.

Keywords

Modulation transfer function;Exposure class;Spatial resolution;Computed radiography;Image plate