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Proceedings Paper

Simulation of presampled MTF measurements in computed radiography for different scan directions
Author(s): Yasuyuki Kawaji; Fukai Toyofuku
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Paper Abstract

Purpose: The modulation transfer function (MTF) in Computed Radiography (CR) for the laser scan direction is generally lower than that for the plate scan direction. In a CR system, there are a number of different mechanisms that cause blurring. We analyzed intrinsic system factors of CR that could affect the MTF, such as afterglow, during readout and the anti-alias filter of analog to digital converter (ADC) in different scan directions. 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. We simulated the influence of afterglow and the anti-alias filter by using Microsoft Excel. The MTFs calculated from those simulation images were compared with the theoretical MTFs obtained analytically. Results: MTFs in the laser scan direction measured with the slit and edge method were significantly lower than MTFs in the plate scan direction because of afterglow and the anti-alias filters. The degree of the 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.

Paper Details

Date Published: 3 March 2012
PDF: 7 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83135P (3 March 2012); doi: 10.1117/12.911138
Show Author Affiliations
Yasuyuki Kawaji, Junshin Gakuen Univ. (Japan)
Fukai Toyofuku, Kyushu Univ. (Japan)

Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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