TY - JOUR
T1 - Influence of readout process on presampled modulation transfer function in computed radiography system
AU - Kawaji, Yasuyuki
AU - Ideguchi, Tadamitsu
AU - Toyofuku, Fukai
AU - Higashida, Yoshiharu
N1 - Funding Information:
I would like to thank Professor J. Morishita (Kyushu University) whose comments and suggestions were of inestimable value for my study. I am also indebt to Professor M. Ohki (Kyushu University) and Associate Professor H. Arimura (Kyushu University) whose comments made enormous contribution to my work. We are grateful to Dr. R. Chartrand (Kurume University) for helpful advice on the English text. Finally, I gratefully appreciate the financial support of JSPS KAKENHI Grant Number 24791349 that made it possible to complete this study.
PY - 2012/11
Y1 - 2012/11
N2 - In a computed radiography (CR) system, there are a number of different mechanisms that cause blurring. The aim of this study was to analyze intrinsic system factors of CR systems that could affect the modulation transfer function (MTF), such as afterglow during readout and the anti-alias filter before analog to digital converter. Methods and Materials: Mathematical slit and edge images were generated from analytical functions. These images were arranged perpendicularly to the laser scan and the plate scan directions, respectively. The influence of afterglow and the anti-alias filter was simulated by using Microsoft Excel. The MTF values calculated from those simulation images were compared with the theoretical MTF values obtained analytically. Results: MTF values in the laser scan direction measured with the slit and edge methods were significantly lower than MTF values in the plate scan direction. The degree of influence on MTF with respect to afterglow and the anti-alias filters was different depending on the measurement method and the scan directions of CR systems. The influence of the anti-alias filters mainly contributed to the differences between MTF values with the slit and edge methods in the laser scan direction.
AB - In a computed radiography (CR) system, there are a number of different mechanisms that cause blurring. The aim of this study was to analyze intrinsic system factors of CR systems that could affect the modulation transfer function (MTF), such as afterglow during readout and the anti-alias filter before analog to digital converter. Methods and Materials: Mathematical slit and edge images were generated from analytical functions. These images were arranged perpendicularly to the laser scan and the plate scan directions, respectively. The influence of afterglow and the anti-alias filter was simulated by using Microsoft Excel. The MTF values calculated from those simulation images were compared with the theoretical MTF values obtained analytically. Results: MTF values in the laser scan direction measured with the slit and edge methods were significantly lower than MTF values in the plate scan direction. The degree of influence on MTF with respect to afterglow and the anti-alias filters was different depending on the measurement method and the scan directions of CR systems. The influence of the anti-alias filters mainly contributed to the differences between MTF values with the slit and edge methods in the laser scan direction.
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U2 - 10.1117/1.OE.51.11.113202
DO - 10.1117/1.OE.51.11.113202
M3 - Article
AN - SCOPUS:84880280335
VL - 51
JO - SPIE J
JF - SPIE J
SN - 0091-3286
IS - 11
M1 - 113202
ER -