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KMID : 1151820140080050225
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Journal of the Korean Society of Radiology
2014 Volume.8 No. 5 p.225 ~ p.230
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Change of MTF for Sampling Interval in Digital Detector
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Cho Hyung-Wook
Chon Kwon-Su
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Abstract
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Assessments of medical image was improved in accordance with development of medical imaging systems. One of them is edge method to determining MTF(Modulation Transfer Function) based on the Fujita method. Fujita was reduced sampling interval used slightly angulated slit to the direction of pixel array and composited finely sampled LSF to determine presampling MTF. In this study, we investigate the effect of sampling interval on the MTF under a digital imaging system by changing wire angle. The wire method was equivalent to the slit method except signal appearance. A Simens’s MAMMOMAT Inspiration with 0.085 × 0.085 mm2 pixel size made by amorphous selenium was used and 96% accuracy on MTF in twice sampling interval compared with Fujita was obtained. However, three times of sampling interval showed 93% accuracy on 50% of MTF and 85% accuracy on 10% of MTF.
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KEYWORD
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X-ray imaging system, Image assessment, Modulation Transfer Function(MTF), Presampling, Sampling interval
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