文章基本信息

标题：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
本地全文：下载
作者：長島宏幸 ; 原川哲美 ; 土井邦雄等
期刊名称：映像情報メディア学会誌
印刷版ISSN：1342-6907
电子版ISSN：1881-6908
出版年度：2010
卷号：64
期号：6
页码：874-880
DOI：10.3169/itej.64.874
出版社：The Institute of Image Information and Television Engineers
摘要：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.
关键词：コンピュータシステム;MRI拡散強調画像;急性期脳梗塞;表示階調調節;濃度ヒストグラム解析