Preparation method of two-dimensional collimator

Abstract

The invention provides a preparation method of a two-dimensional collimator. The preparation method comprises the following steps of 1), providing 3D printing equipment filled with pure tungsten powder, and inputting a model of a two-dimensional collimator to be prepared into the 3D printing equipment; 2), uniformly paving a layer of pure tungsten powder with a preset numerical thickness; 3), performing laser scanning on the pure tungsten powder to melt the pure tungsten powder on the corresponding line segment to form a melt channel; 4), lowering a substrate by a height of a preset numericalvalue; 5), repeating the step 2) to the step 4) for multiple times until a structure with the same height as the two-dimensional collimator is formed on the substrate; and 6), removing the residual powder and the substrate to obtain the required two-dimensional collimator. According to the preparation method, the two-dimensional collimator can be prepared, a better X-ray shielding effect can be achieved, the imaging quality can be improved, light weight and miniaturization of CT equipment are facilitated, meanwhile, pure automation can be achieved in the whole preparation process, and the product consistency and quality controllability can be effectively improved.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a preparation method of a two-dimensional collimator. Background technique [0002] The collimator is an important part of the CT equipment. It is placed under the X-ray radiation source and is used to filter the radiation between the detector and the X-ray signal source that is not in contact with the collimator during the scanning of the human body or object by the CT equipment. X-ray scattering signal parallel to the flakes. [0003] An existing collimator such as figure 1 shown. Existing collimators are usually prepared by rolling and other methods. The process is usually to make tungsten alloy sheets with simple shapes first, and then make the sheets parallel or approximately parallel to each other and assemble them on a fixture. , in order to achieve the effect of shielding the X-ray scattering signal that is not parallel to the tungsten alloy sheet. There are many disadv...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing a two-dimensional collimator, which is used to solve the problem of difficult processing and high failure rate in the prior art of manufacturing collimators by rolling technology. , can only manufacture collimators that shield X-rays in one-dimensional direction, and cannot manufacture pure tungsten collimators but can only use tungsten alloys, but the use of tungsten alloys will reduce the X-ray shielding effect of the collimator and the imaging quality of the equipment. Moreover, the thickness of the thin slices prepared increases the volume and quality of the detector below, which limits the design and development of lightweight and miniaturized CT equipment. At the same time, the tungsten slices can only be assembled on the fixture by hand, and the degree of automatic production is low. Low, the pass rate of the product cannot be effectively controlled, which may easily lead to problems such as damage to the tungsten sheet

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