Korean Journal of Digital Imaging in Medicine (대한디지털의료영상학회논문지)
- Volume 12 Issue 2
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- Pages.127-132
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- 2010
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- 1976-7641(pISSN)
The Evaluation of Image Quality According to the Change of Reconstruction Algorithm of CT Images
재구성 알고리즘 변화에 따른 CT 영상의 화질 평가
- Han, Dong-Kyoon (Department of Radiological Science, College of health science, Eulji University) ;
- Park, Kun-Jin (Department of Diagnostic Radiology, Samsung Medical Center) ;
- Ko, Shin-Kwan (Department of Radiological Science, College of health science, Eulji University)
- Received : 2010.09.02
- Accepted : 2010.10.18
- Published : 2010.11.30
Abstract
In this study, the correlation among the changes of Modulation Transfer Function(MTF) in the noise and high-contrast resolution and the change of Contrast to noise ratio(CNR) in the low-contrast resolution will be examined to investigate the estimation of image quality according to the type of algorithms. The image data obtained by scanning American Association of Physicists in Medicine(AAPM) phantom was applied to each algorithm and the exposure condition of 120 kVp, 250 mAs, and then the CT number and noise were measured. The MTF curved line of the high-contrast resolution was calculated with Point Spread Function(PSF) by using the analysis program by Philips, resulting in 0.5 MTF, 0.1 MTF and 0.02 MTF respectively. The low-contrast resolution was calculated with CNR and the uniformity was measured to each algorithm. Since the measurement value for the uniformity of the equipment was below