Simulation of presampled MTF measurements in computed radiography for different scan directions

Yasuyuki Kawaji; Fukai Toyofuku

doi:10.1117/12.911138

3 March 2012 Simulation of presampled MTF measurements in computed radiography for different scan directions

Yasuyuki Kawaji, Fukai Toyofuku

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 83135P (2012) https://doi.org/10.1117/12.911138
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

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.

Citation Download Citation

Yasuyuki Kawaji and Fukai Toyofuku "Simulation of presampled MTF measurements in computed radiography for different scan directions", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83135P (3 March 2012); https://doi.org/10.1117/12.911138

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KEYWORDS

Modulation transfer functions

Optical filters

Chromium

Computer simulations

Radiography

Nonlinear filtering

Convolution

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