CT (computed tomography) apparatus scan triggering control method and device and CT apparatus

Abstract

The invention provides a CT (computed tomography) apparatus scan triggering control method and device and a CT apparatus. Rotation angle of a single scan period is divided into M angle segments; a reference sampling period, a reference rotation duration of each angle segment, and a reference sampling quantity of each angle segment are pre-determined; during CT scanning, from the first angle segment, current rotation duration of each angle segment is timed when a sensing angle of the start end of the angle segment is received, sampling of the angle segment is started after delaying is performed by a plurality of sampling times that sampling corresponds to, and the current rotation duration of the angle segment is acquired when a sensing signal of the stop end of the angle segment is received; a difference between the current rotation length of the angle segment and the reference rotation duration is calculated, and the difference is compensated through a plurality of sampling-corresponded sampling times in the residual sampling quantity that the angle segment corresponds to. The CT apparatus scan triggering control method and device and the CT apparatus are applicable to compensation of speed error of a gantry.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a scan trigger control method and device for a computed tomography (CT) machine and a CT machine. Background technique [0002] As a kind of medical equipment, CT machine is widely used in the medical and health field to assist doctors in diagnosis. figure 1 A structural schematic diagram of a current CT machine is shown in . Such as figure 1 As shown, the CT machine includes: a bottom support component 11 , a rotating gantry (gantry) 12 , an X-ray tube 13 , an X-ray detector 14 , a control device 15 and an image reconstruction device 16 . [0003] Wherein, the rotating frame (gantry) 12 is generally a ring structure, and is installed on the bottom support member 11, and can rotate around its own axis. Usually, the direction parallel to the axis of the rotating frame 12 is called the Z direction, the horizontal direction perpendicular to the Z direction is called the X directi...

AI Technical Summary

Problems solved by technology

In practical applications, since the rotation speed of the rotating frame 12 may be different in different scanning periods, even the rotating speed of the rotating frame 12 may not be fixed in the same scanning period, so when using the corresponding virtual angle When sampling at a sampling time of α'=360° / MN, there are usually errors, so it is necessary to compensate for these errors

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