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An Improved Methord for the Measurement of Spatial Resolution in CT System |
WANG Tian-tian,YU Xiao-e |
School of Biomedical Engineering, Southern Medical University, Guangzhou, Guangdong 510515, China |
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Abstract MTF can be computed from PSF and ERF ,which represents spatial resolution in CT system.In PSF method, according to the point that the spread rigion should be rounded, the point spread rigion be segmented by image processing, and using mathematical transformation method to identify the center position, and then the MTF curve will be calculated.In ERF method, the goal line should be segmented by image processing, then fitting and using mathematical transformation method to make out, the offset angle can be rotated accordingly.By transform method proposed,the data of the ERF corresponding to each other, the average processing can be made directly.Experiment has proved that the proposed transformation method is accurate, effective, simplified clinical scanning conditions, and convenience for CT evaluation.
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