三次元MR 収集画像の画像歪の評価法の開発 (体積法)

DOI Web Site Web Site PubMed 参考文献6件
  • 藤生 敦哉
    群馬県立県民健康科学大学診療放射線学部(現　桐生厚生総合病院放射線科)
  • 小倉 明夫
    群馬県立県民健康科学大学大学院
  • 浅井 歩実
    群馬県立県民健康科学大学診療放射線学部(現　静岡市立静岡病院放射線技術科)
  • 五月女 華
    群馬県立県民健康科学大学診療放射線学部(現　公立藤岡総合病院放射線診断科)
  • 林 則夫
    群馬県立県民健康科学大学大学院

書誌事項

タイトル別名
  • The Novel Evaluation Method of Geometric Distortion for 3D-MRI
  • サンジゲン MR シュウシュウ ガゾウ ノ ガゾウ ワイ ノ ヒョウカホウ ノ カイハツ(タイセキホウ)

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<p>Recently, many imaging methods are developed in magnetic resonance imaging and in particular, the release of the 3D acquisition method is remarkable. The image distortion often becomes the problem by the gradient echo method and the echo planar imaging (EPI) -based method, but the image distortion of the 3D acquisition is not established. A purpose of this study is to examine the utility of the novel evaluation method of the image distortion for the 3D acquisition image. The spin echo image was used as a criteria image, and EPI was used as a target image for 3D acquisition imaging. Image J was used for the image processing. The value that divided the volume of the different shape of criteria image and the target image by the volume of the criteria image was defined as a distortion rate. Hence, we refer this method to the volume method. It is reported that the distortion rate of the EPI is proportional to a rectangle rate of rectangular field of view (RFOV). The distortion rate of the volume method for 50–100% of rectangle ratio was compared with the theoretical value. In addition, the dependence by the threshold of the binarization was considered. Furthermore, the comparison with the NEMA (National Electrical Manufacturers Association) method was carried out. As a result, the distortion rate decreased according to a rectangular rate of RFOV by the volume method, and the numerical value was equal with a theoretical value. In addition, the distortion rate did not have the effect by the thresholding of binarizing. The volume method had less error of measurement than the NEMA method.</p>

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