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

Inactive Publication Date: 2010-03-17
BEIHANG UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: for the large field of view cone beam X-ray oblique scanning three-dimensional digital imaging method based on the detector bias of the filtered back projection reconstruction algorithm, there are obvious interlayer feature aliasing artifacts, and it is difficult to meet the reconstruction requirements. For applications with high precision requirements, a large field of view cone beam X-ray oblique scanning 3D digital imaging method based on an algebraic reconstruction algorithm is provided. Under the condition that the system hardware, scanning speed and imaging field of view remain unchanged, the quality of the reconstructed image can be significantly improved. Easy rebuild process

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

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[0024] a. Select the data truncation boundary EOF at the edge of the imaging area of ​​the area array detector ABEF;

[0025] b. Make the data truncation boundary EOF perpendicular to the main ray SO and perpendicular to the detector row OG;

[0026] c. Make the system rotation axis z″ intersect the main ray SO in the main ray plane SOG to form a certain ray inclination angle In order to ensure better ray penetration ability, Generally take 45 degrees.

[0027] d. Place the scanned component on the turntable of the digital ray projection image acquisition system;

[0028] e. Transilluminate the scanned component with the collimated cone beam rays. At the same time, the turntable rotates continuously at a constant speed, and the area array detector ABEF continuously collects the ray projections transmitted through the scanned component at a fixed sampling speed to obtain a A sequence of two-dimensional digital ray projection images;

[0029] f. When the turntable rotates ...

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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.

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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04G01N23/083G01N9/24G06T17/00
Inventor 傅健江柏红
Owner BEIHANG UNIV
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