Patent ID: 7706504

Claim:
An X-ray diagnostic apparatus, comprising: an X-ray generating unit which generates X rays; an X-ray detecting unit which detects X rays transmitted through a subject; a contrast agent injection unit which injects a contrast agent into the subject; an X-ray exposure operating unit configured to generate an X-ray exposure trigger signal in response to an operation by an operator; and an X-ray control unit which generates an X-ray generation signal to start generation of the X rays from the X-ray generating unit based on the X-ray exposure trigger signal and a cardiography trigger signal representing a specified phase on an electrocardiogram of the subject; and a contrast agent injection control unit which generates a contrast agent injection signal to start injection of the contrast agent from the contrast agent injection unit based on the X-ray exposure trigger signal and the cardiography trigger signal, wherein the contrast agent injection signal is generated when a predetermined number of cardiography trigger signals have been generated after the generation of the X-ray exposure trigger signal.