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Mobile assembly for pencil beam XCT (X-ray Computed Tomography) system and a method for carrying out image reconstruction and coordinate system origin calibration by using same

A technology for moving components and coordinate systems, which is applied in material analysis using radiation, material analysis using wave/particle radiation, and wave/particle radiation, etc., which can solve the problems of low measurement accuracy and high difficulty.

Inactive Publication Date: 2010-09-15
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

This method has low measurement accuracy and is difficult to operate

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  • Mobile assembly for pencil beam XCT (X-ray Computed Tomography) system and a method for carrying out image reconstruction and coordinate system origin calibration by using same
  • Mobile assembly for pencil beam XCT (X-ray Computed Tomography) system and a method for carrying out image reconstruction and coordinate system origin calibration by using same
  • Mobile assembly for pencil beam XCT (X-ray Computed Tomography) system and a method for carrying out image reconstruction and coordinate system origin calibration by using same

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[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] A method for calibrating the origin of the image reconstruction coordinate system of the cone beam XCT system proposed by the present invention is to check the origin O of the image reconstruction coordinate system of the cone beam XCT system before leaving the factory. d (x o ,z o ) for calibration, or after the cone beam XCT system has been used for a period of time, the origin of the image reconstruction coordinate system O d (x o ,z o ) is a relatively simple and easy-to-operate calibration method used when correcting the position. A set of cone beam XCT system generally consists of a hardware part and a software part, wherein the hardware part includes a ray source, a multi-degree-of-freedom stage, a detector, a controller and a PC; the software part (stored in the hard disk of the PC ) includes a CT control unit, an image rec...

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Abstract

The invention discloses a mobile assembly suitable for a pencil beam XCT (X-ray computed tomography) system and a method for carrying out image reconstruction and coordinate system origin calibration by using the same, mainly aiming at the calibration of a projective coordinate origin of a round track scanning and imaging system based on an FDK (Feldlamp-Davis-Dress) algorithm. Because the accurate space positions of a ray source focus and a detector imaging plane cannot be directly measured, the projective coordinate origin cannot be exactly measured. The method comprises the following steps of: reconstructing an over-determined set based on an image, an image processing method and a least-squares approximation technology by utilizing a DR (Digital Radiograph) image sequence obtained by imaging a single ball target for multiple times at different positions of a pencil beam field; then solving for a projective coordinate point of the ray source focus on the imaging plane; and carrying out three-dimensional reconstruction by utilizing parameter values obtained by using the method to obtain an exact reconstruction result.

Description

technical field [0001] The present invention relates to a cone-beam XCT (X-ray Computed Tomography) system, more particularly, to a method for calibrating the origin of an image reconstruction coordinate system of a cone-beam XCT system. Background technique [0002] In recent years, with the rapid development of computer technology and the emergence of area array detectors, cone-beam X-ray Computed Tomography (Cone-beam X-ray Computed Tomography) has increasingly become a research hotspot in the field of NDT (Non-destructiveTesting). Among many CT reconstruction algorithms, FDK (Feldkamp-Davis-Kress) type algorithms are the most practical and have always been the mainstream in practical engineering applications, considering the amount of computation and the difficulty of engineering implementation. [0003] According to the requirements of the FDK algorithm, it is necessary to accurately know the origin of the image reconstruction coordinate system, that is, the coordinates...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/00G01N23/04G01B15/00
Inventor 许州陈浩王远黎明
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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