New Method of Measuring Presampling MTF by Fourier Transform of Square-wave Chart Image(cientific Paper)

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  • ITIKAWA KATUHIRO
    Central Department of Radiology, Nagoya City University Hospital
  • KUNITOMO HIROSHI
    Central Department of Radiology, Nagoya City University Hospital
  • SAKURAI TAKAHIRO
    Central Department of Radiology, Nagoya City University Hospital
  • OHASHI KAZUYA
    Central Department of Radiology, Nagoya City University Hospital
  • SUGIYAMA MASAYUKI
    Central Department of Radiology, Nagoya City University Hospital
  • IMAZAWA MASAYOSHI
    Central Department of Radiology, Nagoya City University Hospital
  • MIYATI TOSIAKI
    Department of Radiological Technobgy,School of Health Sciences, Faculty of Medicine, Kanazawa University
  • FUJITA HIROSHI
    Division of lnteiligent Image lnformation, Regeneration and Advanced Medical Science, Graduate School of Medicine, Gifu University

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Other Title
  • 矩形波チャート像のフーリエ変換によるプリサンプリングMTFの新しい測定法(論文)

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We developed an easy method of measuring the presampling modulation transfer function (MTF) using the square wave chart in digital radiography. In this method, the presampling MTF is measured by Fourier transform of image data of the square wave chart. When Fourier analysis of the sampling data of a square wave is carried out, it is generally difficult to find the starting point and terminal point of the periodic data that should be extracted because of an insufficient number of data. To solve this problem, interpolated data were calculated by using a window function of the frequency domain. The aliasing error was avoided using a char acteristic such that the square wave has discrete frequency components. The accuracy of this method was in vestigated by computer simulation study. Actual measurement of the presampling MTF by this method was also performed with a CR system. These studies indicated the effectiveness of our proposed method in terms of accuracy and ease of use.

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