CT (computed tomography) machine and X-ray collimator thereof

Abstract

The invention provides a CT (computed tomography) machine and an X-ray collimator thereof. A good collimation effect can be realized. The X-ray collimator comprises a plurality of first plates and second plates. The first plates and the second plates respectively peripherally and axially extend on the CT machine and are spliced with one another, a through hole is formed by each two adjacent first plates and the two corresponding adjacent second plates in an enclosed manner, and extension lines of various side walls of each through hole intersect with one another at a focal point of an X-ray source, so that X-rays can conveniently linearly penetrate the through holes. The CT machine and the X-ray collimator have the advantages that the extension lines of the various side walls of each through hole intersect with one another at the focal point of the X-ray source, the through holes are perforated in extension directions of the various X-rays corresponding to the through holes, accordingly, the X-rays emitted from the focal point of the X-ray source can linearly penetrate the through holes and finally reach a detection unit of an X-ray detector without being blocked, and the good collimation effect can be realized; scattered light rays can be absorbed and blocked by the side walls of the through holes, so that interference of the scattered light rays on the X-rays positioned in the through holes can be prevented, an anti-scattering effect can be improved, and the detection precision can be enhanced.

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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