CT imaging method using tilted multi-cone-beam linear track

Abstract

The invention relates to the technical field of X-ray CT imaging testing, which discloses a CT imaging method using a tilted multi-cone-beam linear track. The imaging method comprises the steps of: projection acquisition, wave filtering and back-projection reconstruction, wherein during the projection acquisition, a detector receives rays from a ray source so as to obtain the sequence of digital ray projective images; during the wave filtering, specified filter function and ray projection are subjected to convolution operation to obtain the data of the filtered projection; and during back-projection reconstruction, the weighted back-projection reconstruction of the data of the filtered projection is conducted according to the system parameters. In the method of the invention, a scanning mode using the tilted multi-cone-beam linear track is adopted, multiple cone beams are aslant installed in different places, an object to be tested passes through all the cone beams in linear motion, the detector collects the rays which pass through the object in different directions, and thus the scanning process is simple, and the scanning rate is high; because of the back-projection reconstruction method, the reconstruction rate is high, and the problems of low detecting rate and large object volume are solved.

Description

technical field [0001] The invention relates to a scanning imaging method using inclined multi-cone beam linear trajectory, belonging to the technical field of X-ray CT. Background technique [0002] In the X-ray CT detection system, the X-ray source emits X-rays, which pass through a certain area of ​​the object to be detected from different angles, and the detector placed opposite the ray source receives the ray projection value of the corresponding angle, and then according to the different angles of the ray The degree of attenuation, using a certain reconstruction algorithm and computer operations, reconstructs the ray attenuation coefficient distribution mapping image of the scanned area of ​​​​the object, so as to realize the reconstruction of the image by projection, and reproduce the medium density, composition and density of the object in the area without loss. structural features, etc. [0003] At present, X-ray-based CT technology has been widely used in medical ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: Aiming at the problems that the detection speed is slow and cannot be used to detect large objects due to the rotation motion based on circular trajectory scanning and spiral trajectory scanning, a tilting method based on linear motion of the inspection platform is proposed. The multi-cone beam CT imaging system adopts the filter back projection reconstruction algorithm, which solves the problems of slow detection speed of conventional CT methods and cannot be used for three-dimensional tomographic detection of large objects, and the scanning and reconstruction process is simple and efficient

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