A front collimator for ct

Abstract

The invention relates to a CT pre-collimator, and the pre-collimator comprises a collimator box, wherein the center of a box cover of the collimator box is provided with a through hole. The box cover is provided with a first arc-shaped guide rail and a second arc-shaped guide rail, which are parallel to each other, are disposed at the left and right side of the through hole and are located at the front and rear parts of the box cover. A first optical gate plate and a second optical gate plate, which are parallel to each other and perpendicular to the first and second arc-shaped guide rails, are disposed between the first and second arc-shaped guide rails, wherein two ends of each optical gate plate cooperate with the first and second arc-shaped guide rails through sliding blocks. The first and second optical gate plates are respectively connected to a first motor and a second motor through a transmission mechanism. The pre-collimator achieves the collimation simulation through the arc-shaped guide rails, and X-rays arriving at a detector are uniform in width. The utilization rate of rays is high, the radiation dosage is small, and there is no image quality problem and image artifact caused by scattered rays. The first and second optical gate plates can be operated independently. The pre-collimator is compact in overall structure, is small in occupied space, is low in cost, and is high in work efficiency.

Description

technical field [0001] The invention belongs to the technical field of particle or ionizing radiation processing technology; irradiation device; gamma ray or X-ray microscope, and particularly relates to a front collimator for CT with high ray utilization rate and no image quality problems and artifacts caused by scattered rays . Background technique [0002] The collimator in CT equipment belongs to an optical element used for input and output of optical fiber communication optical devices, and is mainly used to convert divergent light into parallel light through a structure similar to a convex lens. Generally, there are two front and rear collimators in CT equipment, among which the front collimator is mainly arranged at the front end of the X-ray tube to determine the thickness of the CT scanning slice. [0003] In the prior art, the shutter plate (curved plate or flat plate) of the collimator is generally installed on a linear guide rail and moved through a screw drive ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is that in the prior art, the optical gate plate of the collimator is generally installed on a linear guide rail and moved by a screw drive, and the width of the X-rays passing through the collimation until reaching the spherical detector is uneven, so in order to To completely cover the detector channel, it is necessary to increase the width of the collimation slit, resulting in a large radiation dose, a decrease in image quality, and image artifacts. At the same time, the structure of using the screw drive to control the movement of the shutter plate is complex and takes up a lot of space. , the problem of high cost, and then provides a CT front collimator with an optimized structure

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