Wide visual field cone-beam X ray oblique scanning three-dimension digital imaging method based on algebraic reconstruction algorithm

A technology of oblique scanning and algebraic reconstruction, applied in the field of X-ray computed tomography, can solve the problems of inter-layer feature aliasing artifacts, difficulty in satisfying reconstruction accuracy, etc., and achieve the effect of high reconstructed image quality
CN101672806AInactive Publication Date: 2010-03-17BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2010-03-17
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention belongs to the technical field of X ray computerized tomography (CT), and particularly relates to a wide visual field cone-beam X ray oblique scanning three-dimension digital imaging method based on an algebraic reconstruction algorithm. The method comprises the following steps: acquiring two-dimension projection data of a scanned component in detector biasing wide visual field cone-beam X ray oblique scanning way; and rebuilding an image by the algebraic reconstruction algorithm to obtain a three-dimension computerized tomography image in a scanning area. Compared with the widevisual field cone-beam X ray oblique scanning three-dimension digital imaging method based on a filter back projection algorithm, the method can effectively inhibit structure aliasing between layers and obviously improve the quality of the rebuilt picture in the condition that the system hardware, the scanning view field and the scanning speed are not changed.
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Description

technical field

[0001] The invention relates to a large field of view cone beam X-ray oblique scanning three-dimensional digital imaging method based on an algebraic reconstruction algorithm, belonging to the technical field of X-ray computer tomography (CT). Background technique

[0002] In the X-ray CT system, the X-ray source emits X-rays, which pass through a certain area of ​​the detected object from different angles, and the detector placed opposite the ray source receives them at corresponding angles, and then attenuates the rays according to different degrees at each angle. Using a certain reconstruction algorithm and computer calculations, the ray attenuation coefficient distribution mapping image of the scanned area of ​​​​the object is reconstructed, so that the image can be reconstructed by projection, and the characteristics of the medium density, composition, and structural shape of the object in the area can be reproduced without loss. .

[0003] The current ...

Claims

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