Living body CT scanning control method based on segmented speed regulation

Abstract

The invention discloses a living body CT scanning control method based on segmented speed regulation. The same tested object is scanned twice, so that twice of scanning obtain complementary respiratory phases at the corresponding positions of a tomography device, and accordingly a reconstructed image with respiratory artifacts removed is obtained through projection image screening. In order to make the respiratory phases sampled twice to be complementary at the same angle and take the situation that respiratory of the tested object changes into consideration, each time of scanning is divided into multiple sections, and a motion cycle obtained through calculation of the last section and the current phase are is used for controlling start time and rotation speed of scanning of the later section. Compared with existing retrospective respiratory gating, the limitation that multiple circles of scanning are needed is eliminated, scanning time is greatly shortened, and radiation dose of the tested object are greatly reduced; meanwhile, by means of the design of segmented scanning and variable-speed rotation, dynamics and self-adaptation of a CT scanning system are improved.

Description

technical field [0001] The invention belongs to the technical field of medical CT scanning, and relates to a computer tomography (CT, Computed Tomography) respiratory gating technology and a segmented variable-speed scanning technology, in particular to a method of realizing CT respiratory gating (Respiratory Gate) through two scans. )the design of. Background technique [0002] As a live imaging method, CT imaging has the advantages of high spatial resolution, short imaging time, relatively low cost, and the ability to obtain three-dimensional structural information in living animals. However, when micro-CT is used to image the chest or abdomen of living animals, the respiratory movement of living animals will produce motion artifacts, resulting in a decrease in the spatial resolution of the image. A common solution is to use respiratory gating to reduce motion artifacts in reconstructed images. [0003] The current respiratory gating technology mainly includes extrinsic ...

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Problems solved by technology

[0004] However, in the conventional retrospective respiratory gating including the above-mentioned patent documents, considering the movement of the target during imaging, in order to obtain the data of a certain point in the motion cycle of the measured object and use it to calculate the tomographic image, it is often necessary to collect multiple laps Projection data, increasing the time of image acquisition and the amount of radiation received by the measured object

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