PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of displaying the objectively quantified fat content of the region of interest from CT values which are measured based on image information acquired by using the X-ray CT apparatus.SOLUTION: The X-ray CT apparatus comprises an HD 44 which stores therein a first table where fat contents are respectively associated with the values of the ratios of CT values, a CT value measurement unit 62 which irradiates an object with X-rays under a plurality of different irradiation conditions, and which obtains actually-measured CT values for the respective irradiation conditions, and a fat content extraction unit 65 which calculates the ratio of the actually-measured CT values for the respective irradiation conditions, and which extracts the fat content corresponding to the ratio of the actually-measured CT values, by referring to the first table.COPYRIGHT: (C)2007,JPO&INPIT【課題】X線CT装置を用いて得られた画像情報を基に測定したCT値から、関心領域の含有脂肪率を客観的に定量化して表示すること。【解決手段】X線CT装置は、複数の異なるCT値の比の値に対して、それぞれ含有脂肪率を関連づけた第1のテーブルを記憶するHD44と、被検体に対して複数の異なる照射条件でX線を曝射し、照射条件毎に実測CT値を測定するCT値測定部62と、照射条件間毎の実測CT値の比を算出し、第1のテーブルを参照して、実測CT値の比に対応する含有脂肪率を抽出する含有脂肪率抽出部65とを有する。【選択図】 図2
