320-row Multi Detector Computed Tomography におけるノンヘリカルスキャンの物理特性 Physics Properties of Non-helical Scan Using 320-row Multi Detector Computed Tomography

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Recently, clinical applications utilizing 320-row multi detector computed tomography (320MDCT) have increased, and the physical image properties of 320MDCT have been more concerned. We evaluated the spatial resolution in scan plane and <i>z</i>-direction, image noise and low-contrast sensitivity of non-helical mode (320NH), 640 slices mode by a double slice reconstruction technology (640DS), and 64-row helical mode (64HE) by using a 320MDCT. The spatial resolution in <i>z</i>-direction was evaluated by the section sensitivity profile (SSP) measurement with the micro coin phantom and the contrast transfer ratio (CTR) with the 0.5-mm comb phantom. The in-plane spatial resolution of 320NH was uniform over all the slice positions. The spatial resolution in <i>z</i>-direction decreased from the cathode side toward the anode side. The image noise of the anode side was higher than that of the cathode side. The contrast to noise ratio as index of the low contrast sensitivity was uniform over all the slice position. The CTR of 320NH fluctuated in the <i>z</i>-position, and the fluctuation was improved by 640DS except for the center of rotation.

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  • 日本放射線技術學會雜誌

    日本放射線技術學會雜誌 68(4), 432-442, 2012-04-20

    公益社団法人 日本放射線技術学会

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各種コード

  • NII論文ID(NAID)
    10030139542
  • NII書誌ID(NCID)
    AN00197784
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03694305
  • NDL 記事登録ID
    023760782
  • NDL 請求記号
    Z19-205
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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