X-ray computed tomography apparatus

Abstract

An X-ray computed tomography apparatus includes an X-ray source (101) which generates X-rays, a high voltage generating unit (104) which generates a high voltage to be applied to the X-ray source, an X-ray detector (102) which detects X-rays transmitted through a subject to be examined to generate projection data, a storage unit (203) which stores the projection data in association with electrocardiographic data of the subject, a setting unit (207) which sets a specific cardiac phase in accordance with an operator's instruction, a reconstruction unit (206) which reconstructs a tomogram on the basis of a plurality of projection data sets acquired in a plurality of specific periods centered on the specific cardiac phase throughout a plurality of cardiac cycles, a period extending unit (207) which extends the specific period on the basis of a heart rate fluctuation range of the subject, and a control unit (212) which controls the high voltage generating unit to generate a relatively high dose of X-rays in the extended specific period and generate a relatively low dose of X-rays in a period other than the extended specific period.

Description

[0001] Cross References to Related Applications [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Applications No. 2005-259614 filed on September 7, 2005 and No. 2005-285863 filed on September 30, 2005, the entire contents of which are incorporated herein by reference middle. technical field [0003] The present invention relates to an X-ray computed tomography device capable of synchronous reconstruction of electrocardiogram (ECG gated reconstruction: ECGgated reconstruction). Background technique [0004] X-ray computed tomography device uses images to provide information about the subject according to the intensity of the X-rays that pass through the subject, and plays an important role in various medical activities represented by disease diagnosis, treatment, and surgical planning. effect. [0005] In fast-moving cardiac exams, an electrocardiographically synchronized scan is performed. The so-called ECG synchronous ...

AI Technical Summary

Problems solved by technology

[0009] However, due to arrhythmia, etc., sometimes the projection data required for image reconstruction of the desired heartbeat time phase is not collected, or the projection data is not collected at a high SN ratio.

In this case, the quality of the reconstructed image deteriorates

Depending on the situation, sometimes a rescan is necessary

Also, there is no technique to confirm the above before rebuilding

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