逐次近似再構成法を応用した新しい画像再構成法に対する画質評価 Image Quality Evaluation of New Image Reconstruction Methods Applying the Iterative Reconstruction

この論文にアクセスする

この論文をさがす

著者

抄録

The purpose of this study was to evaluate the image quality of an iterative reconstruction method, the iterative reconstruction in image space (IRIS), which was implemented in a 128-slices multi-detector computed tomography system (MDCT), Siemens Somatom Definition Flash (Definition). We evaluated image noise by standard deviation (SD) as many researchers did before, and in addition, we measured modulation transfer function (MTF), noise power spectrum (NPS), and perceptual low-contrast detectability using a water phantom including a low-contrast object with a 10 Hounsfield unit (HU) contrast, to evaluate whether the noise reduction of IRIS was effective. The SD and NPS were measured from the images of a water phantom. The MTF was measured from images of a thin metal wire and a bar pattern phantom with the bar contrast of 125 HU. The NPS of IRIS was lower than that of filtered back projection (FBP) at middle and high frequency regions. The SD values were reduced by 21%. The MTF of IRIS and FBP measured by the wire phantom coincided precisely. However, for the bar pattern phantom, the MTF values of IRIS at 0.625 and 0.833 cycle/mm were lower than those of FBP. Despite the reduction of the SD and the NPS, the low-contrast detectability study indicated no significant difference between IRIS and FBP. From these results, it was demonstrated that IRIS had the noise reduction performance with exact preservation for high contrast resolution and slight degradation of middle contrast resolution, and could slightly improve the low contrast detectability but with no significance.

収録刊行物

  • 日本放射線技術學會雜誌

    日本放射線技術學會雜誌 68(4), 404-412, 2012-04-20

    公益社団法人 日本放射線技術学会

参考文献:  23件中 1-23件 を表示

被引用文献:  4件中 1-4件 を表示

各種コード

  • NII論文ID(NAID)
    10030139486
  • 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
    023760682
  • NDL 請求記号
    Z19-205
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
ページトップへ