PROBLEM TO BE SOLVED: To provide an X-ray imaging apparatus, being set to the optimum X-ray condition according to an irradiation area of an X-ray to be changed without intervention of an operator in the middle of photographing or radioscopy of a subject.SOLUTION: This X-ray imaging apparatus includes: an X-ray irradiating means 1 for irradiating an X-ray B an X-ray setting means 51 for setting the X-ray condition of the X-ray irradiating means 1 an image acquiring means 7 for acquiring an image of X-rays transmitted through a subject M a light receiving area measuring means 56 for measuring a light receiving area of the X-rays transmitted through the subject M a light quantity measuring means 57 for measuring the quantity of transmitted light of the X-rays transmitted through the subject M light receiving area changing means 80, 81 for changing the light receiving area a calculating means 58 for calculating a quantity of unit area transmitted light from the light receiving area and the quantity of transmitted light a storage means 59 for storing a preset unit area optimum quantity and a control means 52 for controlling the X-ray setting means 51. The control means 52 sets the X-ray conditions so that the quantity of unit area transmitted light is within the unit area optimum quantity according to the displacement of the light receiving area.COPYRIGHT: (C)2011,JPO&INPIT【課題】被検体の撮影又は透視を行う最中に、オペレータを介在することなく、変更するX線の照射面積に応じて、最適なX線条件に設定可能とすること。【解決手段】X線Bを照射するX線照射手段1と、X線照射手段1のX線条件を設定するX線設定手段51と、被検体Mを透過するX線の画像を取得する画像取得手段7と、被検体Mを透過するX線の受光エリアを計測する受光エリア計測手段56と、被検体Mを透過するX線の透過光量を計測する光量計測手段57と、受光エリアを変更する受光エリア変更手段80,81と、受光エリア及び透過光量から単位エリア透過光量を算出する算出手段58と、予め設定した単位エリア最適量を記憶する記憶手段59と、X線設定手段51を制御する制御手段52とを備え、制御手段52は、受光エリアの変位に応じて、単位エリア透過光量が単位エリア最適量内になるようX線条件を設定する。【選択図】図1
