X-ray filter of computer tomography system

Abstract

The invention relates to an X-ray filter of a computer tomography system, and relates to the technical field of computer tomography systems. The two waists of a trapezoidal platform are respectively provided with a protruding step used for fixing, and an arc opening used for filtering emergent light is formed in the upper surface of the trapezoidal platform. The X-ray filter is characterized in that the arc opening is provided with a smooth arc curved surface, in the thickness direction of the trapezoidal platform, the open degree of the opening with the arc curved surface is gradually and continuously increased from one side to the other side of the trapezoidal platform. Due to the arrangement, before scanning and in the scanning process, according to the needed shape and size of the opening, the filter is moved parallel with the thickness direction of the trapezoidal platform of the filter, and the needed curved surface is moved into a plane of ray beams so that useless rays can be filtered out to the maximum extent. The emergent light filtering face has a continuous adjusting effect, in the CT scanning process, it is only required to adopt the filter, and the size of the opening of the filter can be adjusted dynamically according to the shape and the size of a detected human body.

Description

technical field [0001] The present invention relates to the technical field of computer tomography system, that is, CT instrument. Background technique [0002] The image link of computed tomography system (CT) is mainly composed of ray tube, ray filter, collimator and detector. The filter in it can effectively reduce the x-ray radiation dose received by the subject without affecting the image quality. With the promotion and popularization of CT examination in clinical medicine, how to reduce the radiation dose more efficiently has become a hot research direction in the field of CT manufacturing and use. [0003] At present, some of the more common methods in the industry are: [0004] 1. Increasing the thickness of the metal foil filter layer can effectively change the X-ray quality and remove soft rays that are useless for detection. [0005] 2. Multiple sets of morphological filters are added to effectively reduce the radiation dose outside the inspection area. Howeve...

AI Technical Summary

Problems solved by technology

In this way, it will be impossible to use filters of several sizes to achieve a perfect match for all subjects, let alone satisfy the non-circular outline of the human body dynamically in the sub-scan

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