X-ray computed tomography apparatus

摘要

According to one embodiment, an input unit repeatedly inputs a trigger signal originating from a specific cardiac phase from an electrocardiograph. An RR period determination unit determines whether the period between the input time point of the latest trigger signal, of repeatedly input trigger signals, and the input time point of an immediately previously input trigger signal is equal to or more than the preset first threshold, for each input of the latest trigger signal. A scan control unit terminates the generation of X-rays, if it is determined that the period is equal to or more than the first threshold.

主权项

1. An X-ray computed tomography apparatus comprising:
an X-ray tube configured to generate X-rays; an X-ray detector configured to detect X-rays generated from the X-ray tube and transmitted through a subject; a support mechanism configured to rotatably support the X-ray tube and the X-ray detector; an input unit configured to repeatedly input, from an electrocardiograph, a trigger signal originating from a specific cardiac phase in a cardiac cycle of the heart of the subject; an RR period determination unit configured to determine whether a period between an input time point of a latest trigger signal, of the repeatedly input trigger signals, and an input time point of a trigger signal immediately before the latest trigger signal is not less than a preset first threshold, for each input of the latest trigger signal; a condition determination unit configured to determine whether projection data which is configured to be substantially used for image reconstruction at a reconstruction target phase have been acquired, if it is determined that the period is not less than the first threshold; a control unit configured to terminate generation of X-rays from the X-ray tube, if it is determined that the projection data which is configured to be substantially used have been acquired.