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http://dx.doi.org/10.7742/jksr.2021.15.2.173

A Study on the Resolution Analysis of Digital X-ray Images with increasing Thickness of PMMA  

Kim, Junwoo (Center for Advanced Medical Engineering Research, Pusan National University)
Publication Information
Journal of the Korean Society of Radiology / v.15, no.2, 2021 , pp. 173-179 More about this Journal
Abstract
Scattered x-ray generated by digital radiography systems also have the advantage of increasing signals, but ultimately detectability is reduced by decreasing resolution and increasing noise of x-ray images transmitted objects. An indirect method of measuring scattered x-ray in a modulation-transfer function (MTF) for evaluating resolution in a spatial-frequency domain can be considered as a drop in the MTF value corresponding to zero-frequency. In this study, polymethyl methacrylate (PMMA) was used as a patient tissue equivalent, and MTFs were obtained for various thicknesses to quantify the effect of scattered x-ray on resolution. X-ray image signals were observed to decrease by 35 ~ 83% with PMMA thickness increasing, which is determined by the absorption or scattering of x-rays in PMMA, resulting in reduced MTF and increased scatter fraction. The method to compensate for MTF degradation by PMMA resulted in the MTF inflation without considering the optical spreading generated by the indirect-conversion type detector. Data fitting or zero-padding are needed to compensate for MTF more reasonably on edge-spread function or line-spread function.
Keywords
PMMA; Scattered X-ray; MTF;
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