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Proceedings Paper

A method to measure the presampling MTF in digital radiography using Wiener deconvolution
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Paper Abstract

We developed a novel method for determining the presampling modulation transfer function (MTF) of digital radiography systems from slanted edge images based on Wiener deconvolution. The degraded supersampled edge spread function (ESF) was obtained from simulated slanted edge images with known MTF in the presence of poisson noise, and its corresponding ideal ESF without degration was constructed according to its central edge position. To meet the requirements of the absolute integrable condition of Fourier transformation, the origianl ESFs were mirrored to construct the symmetric pattern of ESFs. Then based on Wiener deconvolution technique, the supersampled line spread function (LSF) could be acquired from the symmetric pattern of degraded supersampled ESFs in the presence of ideal symmetric ESFs and system noise. The MTF is then the normalized magnitude of the Fourier transform of the LSF. The determined MTF showed a strong agreement with the theoritical true MTF when appropriated Wiener parameter was chosen. The effects of Wiener parameter value and the width of square-like wave peak in symmetric ESFs were illustrated and discussed. In conclusion, an accurate and simple method to measure the presampling MTF was established using Wiener deconvolution technique according to slanted edge images.

Paper Details

Date Published: 13 March 2013
PDF: 9 pages
Proc. SPIE 8573, Design and Quality for Biomedical Technologies VI, 85730R (13 March 2013); doi: 10.1117/12.2000580
Show Author Affiliations
Zhongxing Zhou, Tianjin Univ. (China)
Qingzhen Zhu, Tianjin Univ. (China)
Feng Gao, Tianjin Univ. (China)
Huijuan Zhao, Tianjin Univ. (China)
Lixin Zhang, Tianjin Univ. (China)
Guohui Li, TEDA Orking Hi-Tech Co. (China)

Published in SPIE Proceedings Vol. 8573:
Design and Quality for Biomedical Technologies VI
Ramesh Raghavachari; Rongguang Liang, Editor(s)

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