Cylindrical beam large visual field X-ray computed tomography (CT) imaging system

Abstract

The invention relates to a cylindrical beam large visual field X-ray computed tomography (CT) imaging system. The system consists of a radiation source system, a capillary modulation system, a sample platform system and a detector system which are sequentially and coaxially connected in an optical way, wherein a capillary device which is used for forming a modulation radiation source so as to enable a cylindrical beam X-ray to be formed by the modulation radiation source is arranged between imaging target samples of the radiation source system and the sample platform system; an X-ray source of the radiation source system is connected with a capillary tube of the capillary modulation system, so that a cylindrical parallel beam is obtained; the detector system is used for acquiring data by adopting a multi-channel signal processor. According to the imaging system, the radiation source system and the detector system are fixed, a rotary table can rotate, the radiation source is capable of emitting the cylindrical beam X-ray after being modulated by the capillary modulation system, and the conventional scanning can be completed for once only by rotating the sample platform at 180 degrees, so that the acquired data is complete; parallel beam is used for reconstruction, and the reconstruction belongs to accurate reconstruction; compared with the conventional system, the cylindrical beam large visual field X-ray CT imaging system is capable of shortening half of the scanning time.

Description

technical field [0001] The invention relates to the technical field of micro-CT scanning imaging, in particular to a cylindrical beam large field of view X-ray CT imaging system. Background technique [0002] At present, the mainstream method of general X-ray CT imaging is circular trajectory cone beam, so that the scanning field of view is relatively large, and scanning and imaging can be performed quickly. However, limited by the scanning trajectory and reconstruction algorithm, the acquired data is often incomplete due to the limitations of the cone beam scanning imaging, and the reconstruction algorithm is also an approximate reconstruction. Coupled with the influence of physical degradation factors such as scattering, the quality and efficiency of the reconstructed image are often There will be different degrees of decline; especially in terms of expanding the imaging field of view, the scanning and splicing of multiple sets of cone beams are more complicated, and the c...

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Problems solved by technology

However, limited by the scanning trajectory and reconstruction algorithm, the acquired data is often incomplete due to the limitations of the cone beam scanning imaging, and the reconstruction algorithm is also an approximate reconstruction. Coupled with the influence of physical degradation factors such as scattering, the quality and efficiency of the reconstructed image are often There will be different degrees of decline; especially in terms of expanding the imaging field of view, the scanning and splicing of multiple sets of cone beams are more complicated, and the corresponding reconstruction formula also needs special design

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