Regardless of the path of insertion of the x-ray plane surface detector, to make head foot direction in the indicatory department display in accurately in order, the x-ray image diagnostic device, applies the x-ray to the suffering inspection body with the X-ray tube sphere 1 which and suffering inspection body 20 it occurs removes the dispersion belt component which the transmitted x-ray of suffering inspection body and 20 the graphics data, is opposed is laid out in the grid 2 which and X-ray tube sphere 1 detects outputs whether in the x-ray plane surface detector is based 3 which and the graphics data displays the image which in the image display section is included 6 which and the graphics data originates in the grid which the parallel slit direction which length or sideIn order the head direction in the field of the suffering inspection body 20 which was photographed to the image on the basis of the distinction result due to grid parallel slit direction distinction section 5b and the grid parallel slit direction distinction section distinguishing, to match upper part direction in the display screen of image display section 6, the image rotary section 5d which turns and, it has the image, image display section 6 displays the image after the turning.X線平面検出器の挿入方向に関わらず、表示部に頭足方向を正確に表示させるために、X線画像診断装置は、被検体にX線を照射するX線管球1と、被検体20により生じる散乱線成分を除去するグリッド2と、X線管球1に対向配置され、被検体20の透過X線を検出して画像データを出力するX線平面検出器3と、画像データに基づく画像を表示する画像表示部6と、画像データに含まれるグリッドに起因する縞方向が縦か横かを判別するグリッド縞方向判別部5bと、グリッド縞方向判別部による判別結果に基づいて、画像に撮影された被検体20の領域における頭方向が、画像表示部6の表示画面において上方向と一致するように、画像を回転する画像回転部5dと、を備え、画像表示部6は、回転後の画像を表示する。
