CT spherical detector structure

Abstract

The invention relates to the field of CT medical imaging, and in particular, relates to a CT spherical detector structure comprising a plurality of detector subassemblies arranged mutually. The detector subassemblies each include a strip-shaped support frame, both sides of each support frame are each connected with a support plate, one end of each support plate is provided with a connecting hole,and the central axis of each connecting hole is perpendicular to the corresponding support frame; the top surface of each support frame includes an arc-shaped base surface located in the middle, and aplurality of side base surfaces inclined to the arc-shaped base surface are arranged on both sides of each arc-shaped base surface; the arc-shaped base surfaces are higher than the side base surfaces, and the height of the side base surfaces farther away from the arc-shaped base surfaces is lower; all the arc-shaped base surfaces and the side base surfaces are connected with a detector module. The detector module is oriented towards a same spherical center. The CT spherical detector structure has the advantages that through arrangement of the stepped support frames, the gap between each two adjacent detector subassemblies in the X-ray direction is greatly reduced while the detector module is guaranteed to be perpendicular to rays emitted by an X-ray bulb tube.

Description

technical field [0001] The invention relates to the field of CT medical imaging, in particular to a CT spherical detector structure. Background technique [0002] A typical CT system consists of the following components: a rotating gantry with an X-ray tube installed, a detector, a data acquisition system and other components that rotate around the patient with the gantry. The detector consists of multiple detectors. The modules are arranged, and the anti-scatter collimator on each detector module is perpendicular to the rays emitted by the X-ray tube. like figure 2 As shown, X-rays are emitted from the X-ray tube and pass through the patient's body. The detector absorbs the attenuated X-rays after passing through the patient's body. The detector converts the X-rays into electrical signals and transmits them to the data acquisition system. The data acquisition system converts the electrical signals After processing, it is transmitted to the computer for image reconstructio...

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Problems solved by technology

[0003] In recent years, the emergence of volume CT and cone-beam CT has led to the continuous increase of the width of the detector in the Z-direction range (Z-direction is the direction of the scanning bed, such as figure 1 As shown in the coordinate system in , X, Y, and Z in the following are all figure 1 The direction of the middle coordinate system), with the increase of the size of the detector in the Z direction, the design of the spherical detector will make the gap between adjacent detector modules in the X direction continue to increase, resulting in a decrease in imaging quality

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