Comparision of Slit Method and Square Wave Response Function Method in the Measurement of Modulation Transfer Function (MTF) of Screen-film Systems

Hatagawa, Masakatsu

doi:10.6009/jjrt.kj00001354330

Nippon Hoshasen Gijutsu Gakkai Zasshi

1996

DOI: 10.6009/jjrt.kj00001354330

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Comparision of Slit Method and Square Wave Response Function Method in the Measurement of Modulation Transfer Function (MTF) of Screen-film Systems

Masakatsu Hatagawa¹

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Cited by 4 publications

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Effect of readout direction in the edge profile on the modulation transfer function of computed radiographic systems by use of the edge method

Tanaka

Morishita

Tsuda

et al. 2013

Radiol Phys Technol

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We investigated the effect of the readout direction of the edge profile obtained by the edge method on the presampled modulation transfer function (MTF) in various computed radiographic (CR) systems. There were no differences in the MTFs derived from two edge profiles in the sub-scanning direction of four CR systems used in this study. On the other hand, the MTFs measured at a readout direction from the low (edge) to the high (direct exposure) exposure region were higher than those measured at a readout direction from the high to the low exposure region in the laser-beam scanning direction for three of the four CR systems. Although this phenomenon depends on the CR system, it is important to understand and indicate both MTFs at the two edge profiles in the laser-beam scanning direction for accurate assessment of the resolution property.

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Effect of readout direction in the edge profile on the modulation transfer function of computed radiographic systems by use of the edge method

Tanaka

Morishita

Tsuda

et al. 2013

Radiol Phys Technol

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Proposal and Verification of Presampled MTF Measurement by the Simple Analysis Method Using the Edge Method

Higashide

Ichikawa²,

Kunitomo³

et al. 2008

Nippon Hoshasen Gijutsu Gakkai Zasshi

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The edge method adopted by the International Electrotechnical Commission (IEC) for presampled modulation transfer function (presampled MTF) measurement has the advantage that the complexity and limitations of image acquisition are less than those of the slit method. On the other hand, it has the disadvantage that the maintenance of accuracy is difficult because of the noise amplification caused by the differentiation. In order to reduce this disadvantage, we proposed an effective method in which many edge profiles are synthesized and then the synthesized edge profiles are bound into regular interval bins. Furthermore, the influences of some factors in edge profile analysis on measurement accuracy were examined. The appropriate width of one bin was 10-20% of the sampling interval. Measurement error of the inclination angle of the edge should be made up to 0.05 degrees . The range of the angle was allowed to be from 1 to 5 degrees. If these conditions were fulfilled, accurate measurement up to the Nyquist frequency (fn) was possible. Using an actual computed radiography (CR) system, the presampled MTF was obtained by the slit method and our edge method. The two results showed good agreement.

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The Evaluation of Physical Imaging Properties for Digital Radiography -The Resolution Property(The Slit Method)

Ideguchi¹

2009

Nippon Hoshasen Gijutsu Gakkai Zasshi

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Comparision of Slit Method and Square Wave Response Function Method in the Measurement of Modulation Transfer Function (MTF) of Screen-film Systems

Cited by 4 publications

References 2 publications

Effect of readout direction in the edge profile on the modulation transfer function of computed radiographic systems by use of the edge method

Effect of readout direction in the edge profile on the modulation transfer function of computed radiographic systems by use of the edge method

Proposal and Verification of Presampled MTF Measurement by the Simple Analysis Method Using the Edge Method

The Evaluation of Physical Imaging Properties for Digital Radiography -The Resolution Property(The Slit Method)

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