PROBLEM TO BE SOLVED: To provide a diagnostic x-ray system and a method thereof capable of comparing perfusion before and after a medical cure without increasing an exposure dose.SOLUTION: A diagnostic x-ray system includes: a CT-image projection unit that obtains a third perfusive-flow image by projecting a second perfusive-flow image obtained by computed tomography in the same direction as a projection direction in which an X-ray is projected toward a test subject to obtain a first perfusive-flow image a positioning unit that obtains positioning information by performing positioning of the first perfusive-flow image and the third perfusive-flow image a perfusive-flow index calculation unit that calculates a first perfusive-flow index from the first perfusive-flow image, and calculates a second perfusive-flow index from the third perfusive-flow image and a comparative-index calculation unit that calculates a comparative index based on the first perfusive-flow index and the second perfusive-flow index, by comparing the first perfusive-flow index with the second perfusive-flow index, based on the positioning information obtained by the positioning unit.COPYRIGHT: (C)2011,JPO&INPIT【課題】被曝線量を増加させることなく治療前後でのパーフュージョンの比較を行うこと。【解決手段】X線の第1の灌流画像を取得する被検体への投影方向と同一方向でコンピュータ断層撮影法により取得された第2の灌流画像を投影して第3の灌流画像を取得するCT画像投影部と、前記第1の灌流画像と前記第3の灌流画像との位置合わせを行って位置合わせ情報を求める位置合わせ部と、前記第1の灌流画像から第1の灌流指標を算出し、前記第3の灌流画像から第2の灌流指標を算出する灌流指標算出部と、前記位置合わせ手段により求められた前記位置合わせ情報を基にして前記第1の灌流指標と前記第2の灌流指標とを比較し、前記第1の灌流指標と前記第2の灌流指標とに基づく比較指標を算出する比較指標算出部とを含むX線診断装置である。【選択図】図1
