A kind of CT machine and its X-ray collimator

Abstract

A computed tomography system and an X-ray collimator thereof are provided, which have a good collimator effect. The X-ray collimator includes a plurality of first plates extending in the circumferential direction of the computed tomography system and a plurality of second plates extending in the axial direction of the computed tomography system. The first plates and the second plates are inserted and engaged. Two adjacent first plates and two adjacent second plates define a through hole, and the extensions of the side walls of the through hole intersect at the focal spot of an X-ray source, so that the X-rays can pass through the through hole in a straight line. Since the extensions of the side walls of the through holes intersect at the focal spot of the X-ray source, the through holes are aligned with the radiation direction of corresponding X-rays.

Description

technical field [0001] The invention relates to the technical field of medical machinery, in particular to an X-ray collimator of a CT machine. The present invention also relates to a CT machine with the above-mentioned X-ray collimator. Background technique [0002] In a CT machine, an object to be inspected is transmitted by the X-rays emitted by an X-ray source with an approximate point-like focus, and the two-dimensional attenuation distribution of the X-rays passing through the object to be inspected is measured by the detector, and the distribution data is processed by a computer Generate corresponding tomographic images. [0003] In current medical CT machines, solid detectors are mainly used for X-ray measurement. This solid-state detector is usually an X-ray photoelectric receiver array formed by a number of optoelectronic semiconductor units arranged in a grid matrix, usually a pixel matrix of 16×16 or 16×32 pixels. [0004] Ideally, X-rays propagate in a straig...

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Problems solved by technology

[0012] The current X-ray collimator, in the first configuration, uses sheet metal stamping to form a bent lattice-like member, which is formed by bonding figure 1 For the X-ray collimator shown, see the Chinese patent No. 03826552.4 and titled "An Anti-scattering X-ray Collimator for CT Scanning Device" for details; , resulting in low precision

In the second setting method, the array grid holes are stacked and accumulated to form figure 1 For the X-ray collimator shown, see the Chinese patent No. 200810009502.5 and titled "Stacked CT Collimator and Its Preparation Method" for details; It is necessary to ensure that each layer has a uniform size of the primary ray penetration area, and it is difficult to ensure the consistency of anti-scattering

In the third setting method, an X-ray collimator similar to 3D printing can be used. For details, see the Chinese patent No. 02144468.4 and the name "Method for Manufacturing Scattering Grating or Collimator"; in the third setting In the printing method, the wall thickness of the through hole formed by printing is relatively thick, which will greatly block the primary ray, and the anti-scattering effect will be inconsistent due to the uneven wall thickness.

In the fourth setting mode, tenon-tenon connection type X-ray collimator can be used, see the US patent No. 20070258566A1 and the name "ANTI-SCATTER-GRID" for details; in the fourth setting mode, the composition X There are many components in the ray collimator, and the manufacturing and assembly process is very complicated

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