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Image Evaluation of Resolution Parameter and Reconstitution Filter in 256 Multi Detector Computed Tomography by Using Head Phantom

256 다중 검출기 전산화단층촬영에서 두개부 전용 팬톰을 이용한 분해능 파라메터와 재구성 필터의 영상 평가

  • 구본승 (분당서울대학교병원 영상의학과) ;
  • 성열훈 (청주대학교 방사선학과)
  • Received : 2011.09.19
  • Accepted : 2011.11.04
  • Published : 2011.12.28

Abstract

The purpose of this study was to evaluate of resolution parameter and reconstitution filter in the 256 multi detector computed tomography(MDCT) by using the head phantom. We used 256 MDCT, and head phantom of philips system. We evaluated to image quality by using Extended Brilliance Workspace. The protocol were axial scan method with 120 kVp, 0.5 sec of rotation time, 5 mm of slice thickness and increment, 250 mm of field of view(FOV), $512{\times}512$ of matrix size, 1.0 of pitch, $128{\times}0.625$ mm of collimations. The resolution parameter was applied for 'Standard', 'High' and 'Ultrahigh'. The reconstitution filters were changed to seven type of 'A', 'B', 'C', 'D', 'UA', 'UB', 'UC'. The assesment factors of image quality were the uniformity, the noise, the linearity and 50% and 10% of the modulation transfer function(MTF). Finally The good image quality in 'High' resolution parameter showed at the uniformity, the linearity and 50% and 10% of MTF. The 'UA', 'UB' reconstitution filter showed at the good image quality of the uniformity and the noise and 'C' reconstitution filter showed at the same result of the linearity and 50% and 10% of MTF.

Keywords

256 Multi Detector Computed Tomography;Head Phantom;Resolution Parameter;Reconstitution Filter

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