濃度ヒストグラム解析に基づく脳MRI拡散強調画像における表示階調の自動調節  [in Japanese] Computerized Scheme for Automated Adjustment of Display Grayscale in Brain Diffusion-Weighted Magnetic Resonance Images Based on Density Histogram Analysis  [in Japanese]

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Author(s)

    • 長島 宏幸 NAGASHIMA Hiroyuki
    • 群馬県立県民健康科学大学 診療放射線学部 School of Radiological Technology, Gunma Prefectural College of Health Sciences
    • 土井 邦雄 DOI Kunio
    • 群馬県立県民健康科学大学 診療放射線学部 School of Radiological Technology, Gunma Prefectural College of Health Sciences

Abstract

To assist radiologists in interpreting diffusion-weighted magnetic resonance images (DWI), we have developed a computerized scheme for proper adjustment of these images that is based on density histogram analysis of concurrent images (b0 images). In our computerized scheme, the gray level of a b0 image is first normalized and the brain region is segmented using thresholding and labeling techniques. The density histogram is then calculated from the brain region on the original b0 image and the pixel value of maximum frequency in the density histogram is determined. The display grayscale in the DWI is finally adjusted by using the determined pixel value. With the existing adjustment method using thalamic signal intensity, the variation between 60 cases of evaluation index for image contrast calculated from the adjusted DWI was ±24.2% and with our method, it was ±16.5%. Our computerized scheme is therefore a very promising technique for determining the display grayscale of brain DWI.

Journal

  • The Journal of The Institute of Image Information and Television Engineers

    The Journal of The Institute of Image Information and Television Engineers 64(6), 874-880, 2010-06-01

    The Institute of Image Information and Television Engineers

References:  26

Codes

  • NII Article ID (NAID)
    10026453687
  • NII NACSIS-CAT ID (NCID)
    AN10588970
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    13426907
  • NDL Article ID
    10721759
  • NDL Source Classification
    ZN33(科学技術--電気工学・電気機械工業--電子工学・電気通信)
  • NDL Call No.
    Z16-307
  • Data Source
    CJP  NDL  J-STAGE 
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