Nonlinear Effect on Noise Power Spectrum for Quantum Mottle in Radiographs

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Rossmann's formula on the power spectrum of quantum noise in a radiograph is based on an assumption that the relation between the spatial fluctuations of optical density and the relative spatial fluctuations of light energy irradiated from the intensifying screen due to absorbed x-ray quanta is linear. The reasonability of the assumption is not theoretically obvious because the relative spatial fluctuation of light energy increases as the number of absorbed x-ray quanta decreases.<BR>Based on the shot-noise theory, the power spectrum of q uantum noise is calculated taking account of the second order of the spatial fluctuation of light energy and the spectrum is expressed as a function of the gradient, the modulation transfer function of the screen-film system, and the average number of absorbed x-ray quanta. The term caused by the nonlinearity between the spatial fluctuations of optical density and light energy per unit area for the noise power spectrum is also estimated using the <I>mhits model</I> for the emulsion and it is found that the effect due to the nonlinearity is little in practice.

収録刊行物

  • 医学物理 : 日本医学物理学会機関誌 = Japanese journal of medical physics : an official journal of Japan Society of Medical Physics  

    医学物理 : 日本医学物理学会機関誌 = Japanese journal of medical physics : an official journal of Japan Society of Medical Physics 20(2), 83-94, 2000-06-30 

    一般社団法人 日本医学物理学会

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各種コード

  • NII論文ID(NAID)
    10004573860
  • NII書誌ID(NCID)
    AA11580542
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13455354
  • NDL 記事登録ID
    5673713
  • NDL 雑誌分類
    ZS45(科学技術--医学--放射線医学)
  • NDL 請求記号
    Z19-1395
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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