X-ray diagnostic apparatus

An X-ray diagnostic apparatus comprising:

• an X-ray generator that generates X rays;
• an X-ray detector that detects the X rays generated by the X-ray generator and having passed through a subject;
• an X-ray restrictor that restricts an irradiation range on a detection surface of the X-ray detector of the X rays generated by the X-ray generator;
• an image generator that generates a plurality of X-ray images related to the subject;
• an image change detector that detects a partial range of an image change from each of the X-ray images and also outputs an extension switching signal according to the partial range of the image change;
• and
• an X-ray restrictor controller that controls the X-ray restrictor such that the irradiation range of the X rays is extended to a predetermined range in response to output of the extension switching signal.

An X-ray diagnostic apparatus comprising:

• an X-ray generator that generates X rays;
• an X-ray detector that detects the X rays generated by the X-ray generator and having passed through a subject;
• an X-ray restrictor that restricts an irradiation range on a detection surface of the X-ray detector of the X rays generated by the X-ray generator;
• a signal input unit that inputs an operation signal from a medical instrument used to treat or operate on the subject;
• a signal detector that detects use of the medical instrument from the operation signal and also outputs an extension switching signal according to the detected use;
• and
• an X-ray restrictor controller that controls the X-ray restrictor such that the irradiation range of the X rays is extended to a predetermined range in response to output of the extension switching signal.

An X-ray diagnostic apparatus comprising:

• an X-ray generator that generates X rays;
• an X-ray detector that detects the X rays generated by the X-ray generator and having passed through a subject;
• an X-ray restrictor that restricts an irradiation range on a detection surface of the X-ray detector of the X rays generated by the X-ray generator;
• a signal input unit that inputs an audio signal of a user involved in treatment or an operation of the subject;
• a signal detector that detects at least one of a specific word and a specific sound volume from the audio signal and also outputs an extension switching signal according to the at least one of the specific word and the specific sound volume;
• and
• an X-ray restrictor controller that controls the X-ray restrictor such that the irradiation range of the X rays is extended to a predetermined range in response to output of the extension switching signal.