PROBLEM TO BE SOLVED: To display a DE image suitable for diagnosis of a target part, with respect to an X-ray diagnostic apparatus and an image processor.SOLUTION: The X-ray diagnostic apparatus 10 has: an X-ray photography control part 31 which controls so that a subject is subjected to X-ray photography using first quality of radiation and X-ray photography using second quality of radiation which is smaller than the first quality of radiation an image memory 13 which stores a first image to be generated by the X-ray photography using the first quality of radiation and a second image to be generated by the X-ray photography using the second quality of radiation a representative value operation part 322 which acquires a pixel value group as a representative value group in the first image and acquires a pixel value group as a representative value group in the second image a width operation part 323 which calculates width of a pixel value between the representative value groups in the first image as first width and calculates width of a pixel value between the representative value group in the second image as second width a ratio operation part 324 which calculates ratio between the first width and the second width and a coefficient processing part 33 which uses the ratio as a weighting factor to generate a dual energy image based on the first and second images.COPYRIGHT: (C)2011,JPO&INPIT【課題】X線診断装置及び画像処理装置において、目的部位の診断に適したDE画像を表示すること。【解決手段】X線診断装置10は、被検体に対して、第1線質を用いたX線撮影と、第1線質より小さい第2線質を用いたX線撮影とを行なうように制御するX線撮影制御部31と、第1線質を用いたX線撮影によって生成される第1画像と、第2線質を用いたX線撮影によって生成される第2画像とを記憶する画像メモリ13と、第1画像内の代表値群としての画素値群を取得すると共に、第2画像内の代表値群としての画素値群を取得する代表値演算部322と、第1画像内の代表値群間の画素値の幅を第1幅として算出すると共に、第2画像内の代表値群間の画素値の幅を第2幅として算出する幅演算部323と、第1幅及び第2幅の比を算出する比演算部324と、比を重み係数とし、第1画像及び第2画像を基にデュアルエナジー画像を生成する係数処理部33と、を有する。【選択図】 図4
