CT (computed tomography) machine and real-time monitoring method for focal point of bulb tube of CT machine

Abstract

The invention discloses a CT (computed tomography) machine. The CT machine comprises a bulb tube, a ray box, a collimator and at least one pair of reference detectors, wherein the collimator is positioned in the ray box; the reference detectors are arranged in the ray box; the reference detectors and the bulb tube are respectively positioned on two sides of the collimator along a ray exiting direction; and the reference detectors are positioned in a penumbra field of rays of the bulb tube. The invention also provides a real-time monitoring method for the focal point of the bulb tube of the CT machine. The reference detectors are arranged in the ray box of the CT machine, so that the size and the position of the focal point of the bulb tube can be simultaneously monitored. Compared with a method for only monitoring the position of the focal point, the real-time monitoring method has the advantages that the accurate data of the position and the size of the focal point of the bulb tube can be acquired, and the quality of reconstructed images is improved.

Description

technical field [0001] The invention relates to a CT machine, in particular to a CT machine capable of real-time monitoring of the focus state of a ball tube and a real-time monitoring method for the focus of the ball tube. Background technique [0002] The main structure of CT includes two parts: X-ray tomographic scanning device and computer system. The former is mainly composed of a tube that emits X-ray beams, and a detector that receives and detects X-rays; the latter mainly includes a data acquisition system, a central processing system, a tape drive, and an operating table. [0003] The X-ray tube and the detector are respectively installed on both sides of the tissue to be scanned in opposite directions. When the X-rays generated by the tube pass through the scanned tissue, the remaining rays that pass through the tissue are received by the detector. The detector is highly sensitive to X-rays. It converts the received X-rays into analog signals, and then converts t...

AI Technical Summary

Problems solved by technology

The pre-scanning procedure of this method is complicated, and the focal point change law is different when the tube is scanned under different heat capacity states. The correction by pre-scanning cannot completely remove the artifacts caused by the offset.

At the same time, this method can only calculate the change of the focus position of the tube, and does not consider the correction of the impact of the change of the focus size on the image.

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