PROBLEM TO BE SOLVED: To provide a method for deriving an amount of dense tissue from the digital mammographic image representation.SOLUTION: A target region within the image is determined, and the values hint(x, y) within the target region for respective pixels are computed at respective positions (x, y) within the target region, and the amount of the dense tissue under the pixels is expressed in the expression. The positions p(x, y) represent the pixel values at the positions (x, y) of the digital mammographic image. Pfat is a reference fat pixel value. &mufat and &muint are linear attenuation coefficients of the fat tissue and the dense tissue. E is the mono-energetic energy value of an X-ray source when the image is recorded. E and Pfat are obtained from the digital mammographic image representation.COPYRIGHT: (C)2010,JPO&INPIT【課題】デジタル乳房造影画像表示からある量の濃厚組織を得るための方法。【解決手段】画像内の対象領域が決定され、該対象領域内の各位置(x,y)で各画素に対して対象領域内で値hint(x,y)が計算されて前記画素の下で濃厚組織の量を次式で示す。但し、位置p(x,y)は前記デジタル乳房造影画像の位置(x,y)での画素の画素値を示し、pfatは基準fat画素値であり、μfat,μintがfat組織と濃厚組織の線形減衰係数であり、Eは画像記録時のx線源のモノエネルギー的エネルギー値であり、Eとpfatが前記デジタル乳房造影画像表示から得られた。【選択図】図1
