Influence of readout process on presampled modulation transfer function in computed radiography system

Yasuyuki Kawaji; Fukai Toyofuku; Tadamitsu Ideguchi; Yoshiharu Higashida

doi:10.1117/1.OE.51.11.113202

1 November 2012 Influence of readout process on presampled modulation transfer function in computed radiography system

Yasuyuki Kawaji, Fukai Toyofuku, Tadamitsu Ideguchi, Yoshiharu Higashida

Author Affiliations +

Optical Engineering, Vol. 51, Issue 11, 113202 (November 2012). https://doi.org/10.1117/1.OE.51.11.113202

Abstract

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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Yasuyuki Kawaji, Fukai Toyofuku, Tadamitsu Ideguchi, and Yoshiharu Higashida "Influence of readout process on presampled modulation transfer function in computed radiography system," Optical Engineering 51(11), 113202 (1 November 2012). https://doi.org/10.1117/1.OE.51.11.113202

Published: 1 November 2012

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