Patent ID: 8755490

Claim:
An X-ray imaging device, comprising: an X-ray tube irradiating a subject by X ray; an X-ray detector imaging the X ray that passes through the subject; a phototimer receiving an electrical signal from a phototimer detector and controlling an X-ray exposure time; an X-ray controller controlling an X-ray exposure; a measurement unit measuring a body thickness of the subject; a control console controlling the X-ray tube, the X-ray detector, the phototimer, the X-ray controller and the measurement unit; and a storage unit storing a database showing a plurality of relationships between a body thickness of the subject, an X-ray parameter, and an imaging time and/or a plurality of relationships between the body thickness of the subject, an X-ray parameter, and an imaging time in each imaged part, wherein the control console comprises a search processor, comparing a backup time and the imagining time and regulating the backup time according to a comparison result of comparing the backup time and the imagining time, the backup time is set by the X-ray controller as a time limit of the X-ray exposure, the imaging time is shown in the database in a case when the body thickness measured from a body of the subject approaches the body thickness in the database and an X-ray parameter set by the control console approaches the X-ray parameter in the database.