PROBLEM TO BE SOLVED: To achieve an appropriate luminance level by improving the accuracy of ABC control in an X-ray diagnostic apparatus.SOLUTION: The X-ray diagnostic apparatus 100 includes: an X-ray tube 81 a high-voltage generating part 10 for applying tube voltage to the X-ray tube 81 for generating X rays from the X-ray tube 81 and feeding tube currents an X-ray detecting part 9 for detecting X rays generated from the X-ray tube 81 and transmitting a subject an image generating part 11 for generating an X-ray image based on the output of the X-ray detecting part 9 a range determining part 13 for determining a partial range according to prescribed rules from a pixel value range between the maximum pixel value and the minimum pixel value within a region of interest in the generated X-ray image and an X-ray control part 17 for determining X-ray conditions based on the pixel values in the partial range and controlling the high-voltage generating part 10 based on the determined X-ray conditions.COPYRIGHT: (C)2011,JPO&INPIT【課題】X線診断装置において、ABC制御の精度を向上し、適切な輝度レベルを得ること。【解決手段】X線診断装置100は、X線管81と、X線管81からX線を発生させるためにX線管81に管電圧を印加し、管電流を供給する高電圧発生部10と、X線管81から発生され、被検体を透過したX線を検出するX線検出部9と、X線検出部9の出力に基づいて、X線像を発生する画像発生部11と、発生されたX線像における関心領域内の最大画素値と最小画素値との画素値範囲から、所定の規則に従って一部範囲を決定する範囲決定部13と、一部範囲内の画素値に基づいてX線条件を決定し、決定したX線条件に基づいて前記高電圧発生部10を制御するX線制御部17とを具備する。【選択図】図1
