X-ray computer tomography device and tomography method

Abstract

An X-ray CT apparatus detects a predetermined characteristic wave from each electrocardiographic waveform acquired from an electrocardiograph, predicts intervals with which the characteristic wave appears based on appearance times of the detected predetermined characteristic wave in each electrocardiographic waveform, and determines an X-ray irradiation start time based on the predicted interval time. After an instruction to start collection of X-ray intensity distribution data is received, if an appearance interval of a detected predetermined characteristic wave is within an acceptable normal-heartbeat range, it is determined as a normal heartbeat. If the appearance interval of the detected predetermined characteristic wave is outside the acceptable normal-heartbeat range, it is determined as an abnormal heartbeat. During a period after receiving the instruction to start the collection until reaching a time of starting the collection of X-ray detection information, when determined as an abnormal heartbeat, an X-ray irradiation start time is recalculated, and then determined.

Description

[0001] References to related applications [0002] This application enjoys the priority right of the Japanese patent application No. 2007-223035 filed on August 29, 2007, and the entire content of the Japanese patent application is cited in this application. technical field [0003] The invention relates to an X-ray computed tomography apparatus and a tomography method. Background technique [0004] In the prior art, an X-ray computed tomography apparatus (hereinafter referred to as an X-ray CT apparatus, CT: Computed Tomography) reconstructs the Provide a tomographic image representing the shape information of the human body tissue in the subject on the plane (tomographic plane) irradiated with X-rays, so that in various medical activities based on disease diagnosis, treatment, operation planning, etc. , plays an important role. [0005] In cardiac examinations for diagnosing heart diseases and the like using cardiac tomographic images of a subject provided by an X-ray CT...

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Problems solved by technology

That is, the above-mentioned prior art can acquire a required amount of X-ray intensity distribution data of a predetermined specific phase even if an abnormal heartbeat occurs before imaging, but since the imaging cannot be changed according to the abnormal heartbeat before imaging, schedule, so there is the issue of unnecessary exposures that generate x-rays

[0013] Here, it is described that in the retrospective electrocardiogram gating method, in order to obtain the necessary amount of X-ray intensity distribution data of a predetermined specific phase, there is a problem that the X-ray exposure amount becomes large, but there is also a problem in the prospective electrocardiogram gating method. same question

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