External spiral cone beam CT (computed tomography) scanning imaging method of large-size industrial long pipeline pipe wall

A technology of CT scanning and imaging methods, which is applied in the field of CT scanning and imaging, and can solve problems such as distorted and reconstructed images

Active Publication Date: 2012-01-25
CHONGQING UNIV
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However, for the external CT reconstruction problem, th

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  • External spiral cone beam CT (computed tomography) scanning imaging method of large-size industrial long pipeline pipe wall
  • External spiral cone beam CT (computed tomography) scanning imaging method of large-size industrial long pipeline pipe wall
  • External spiral cone beam CT (computed tomography) scanning imaging method of large-size industrial long pipeline pipe wall

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[0069] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0070] figure 1 It is a schematic diagram of the pipeline detection structure of the present invention; figure 2 It is a schematic cross-sectional view of the pipeline to be detected when scanning in the present invention; image 3 It is a block diagram of the scanning imaging method of the present invention, as shown in the figure: in the external spiral cone beam CT scanning imaging method of a large-scale industrial long pipe wall provided by the present invention, the pipeline 2 to be detected is arranged on the rotary table 1, and the rotary table The center of 1 is the origin to establish a rectangular coordinate system, the x-axis is the connection between the ...

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Abstract

The invention discloses an external spiral cone beam CT (computed tomography) scanning imaging method of a large-size industrial long pipeline pipe wall, and relates to an external spiral cone beam CT scanning imaging method. Before scanning, a radial source is deflected and a plane array detector is offset to make conical radial beams cover the pipe wall area of one side of the cross section of a pipeline; in scanning, the pipeline is driven by a rotary table to rotate around a rotary shaft, and simultaneously the radial source and the detector are synchronously ascended and descended for scanning along the direction of the rotary shaft so as to obtain external spiral cone beam CT projection data of the pipe wall area; and a three-dimensional image of the pipe wall area to be detected isobtained in an improved external spiral cone beam CT iterative reconstruction algorithm provided by the invention. In the method disclosed by the invention, the detection of the large-size industriallong pipeline pipe wall is realized by a small-size plane array detector and the existing CT machine structure, the scanning process is easy to realize mechanically, one-step spiral cone beam scanning is adopted, and the detection speed is high. The reconstructed image of the pipe wall has good quality and high resolution, and nondestructive evaluation on the pipeline is easy to carry out.

Description

technical field [0001] The invention relates to a CT scanning imaging method, in particular to an external helical cone beam CT scanning imaging method of the pipe wall of a large-scale industrial pipeline. Background technique [0002] Large-scale pipelines (such as oil pipelines, natural gas pipelines, etc.) are widely used in real industries. From manufacture to use, they often go through various processes such as processing, storage, transportation, loading and unloading, etc. In each of these processes Some changes may occur in each part of the pipeline, and some defects may occur. Non-destructive testing is a necessary measure to prevent disasters and reduce economic losses, and has important practical significance. [0003] In the prior art, the non-destructive testing method is commonly used for pipelines, and the non-destructive testing does not require disassembly and assembly of the pipeline, and the method is fast and convenient; but now a large number of perspec...

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Application Information

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IPC IPC(8): G01N23/04
Inventor 曾理郭吉强刘宝东余维
Owner CHONGQING UNIV
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