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| A Combination of Measuring Methods for Modulation Transfer Characteristic of Proximity X-ray Imaging System |
| MU Yi-ning,WANG He,LI Ye,LI Ping,ZHU Ling-xi |
| Changchun University of Science and Technology, Changchun, Jilin 130022, China |
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Abstract Using the evaluating principle of modulation transfer function, an optical modulation transfer characteristic detection methodology of proximity focusing X-ray imaging system is brought up on the basis of the signal transfer relationship between each imaging subsystem. From the constraints of image-intensifier tubes, the generation process of ray source and imaging restriction of its spot size constraints, the constraints of noise three perspectives to calibrate theoretical modulation transfer characteristic of proximity X-ray imaging system. Change CCD telescopic system of proximity X-ray imaging system back end to CCD microscopy system, to multi-spatial resolution balls of lead grating imaging and MTF curve fitting, and as the experimental results suggest, the curve fitting precision can be significantly improved by time domain equalization. Fitting results indicate that modulation transfer function still are equal to 10% when spatial resolution reaches 10lp/mm, this is consistent with that of the theoretical calibration. So that the resolution of traditional proximity X-ray imaging system is really the bottleneck.
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Received: 29 October 2014
Published: 29 July 2016
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2016, Vol. 37 
