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Cone beam CT local scanning imagery for fluid in pipelines

A technology of scanning imaging and internal fluid, applied in the field of CT scanning imaging

Inactive Publication Date: 2015-05-13
CHONGQING UNIV
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Problems solved by technology

The wavelet-based multi-resolution local reconstruction algorithm is a direction of local reconstruction research in recent years. It is different from the Lamda Tomography algorithm and Pseudolocal Tomography algorithm. big dependency

Method used

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  • Cone beam CT local scanning imagery for fluid in pipelines
  • Cone beam CT local scanning imagery for fluid in pipelines
  • Cone beam CT local scanning imagery for fluid in pipelines

Examples

Experimental program
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Embodiment Construction

[0033] 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.

[0034] In the cone beam CT local scanning imaging method of the fluid in the pipeline in this embodiment, the radiation source 4 and the detector 3 are arranged on the circular track 5 around the pipe wall of the pipeline 1, so that the initial radiation source 4 reaches the central axis of the pipeline 1 The vertical foot of the coordinate origin O establishes a space Cartesian coordinate system O-xyz, the x-axis is the connection between the origin and the ray source 4 and the positive direction is from the origin to the ray source 4, and the y-axis is transverse along the pipeline 1 and perpendicular to the x-axis The coordinate axis, the z axis is the coordinate axis...

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Abstract

The invention discloses a cone beam CT (Computed Tomography) local scanning imagery for fluid in pipelines, and relates to a nondestructive examination technology for pipelines in use. The method comprises the following steps: mounting a radiation source and an area-array detector on a round track coiled on a pipe wall before scanning, while scanning, making the radiation source and the area-array detector perform circular motion along the track around the pipeline during scanning, simultaneously, by flowing of fluid, obtaining equivalent spiral cone beam projection data of inclusions-containing fluid, and then, obtaining a three-dimensional image of the fluid inclusions in the to-be-detected pipeline by means of combining a spiral cone beam FDK (Feldkamp) image reconstruction algorithm with a local filter. Mechanical motion of such scanning mode is simple and easy to implement, and can easily adapt to field conditions of pipeline field in-use detection; local reconstruction image of the inclusions-containing fluid in the pipeline has good quality and high resolution.

Description

technical field [0001] The invention relates to a CT (Computed Tomography) scanning imaging method, in particular to an equivalent helical cone-beam CT scanning imaging method for pipelines containing inclusion fluids (that is, equivalent to pipelines containing inclusion fluids at rest, ray sources and detectors Helical cone beam scanning around the pipe). Background technique [0002] The inclusion of flowing liquid in the pipeline (spherical, massive or irregular solids) is likely to cause pipeline blockage (especially the inclusion of thin pipelines after entering the bifurcation from the main pipeline), thereby affecting the flow rate of the liquid and even causing accidents. Therefore, the inclusion detection of flowing liquid in pipelines (especially in-service pipelines) has great practical significance. [0003] The most commonly used cone-beam CT image reconstruction algorithm is the FDK (Feldkamp) image reconstruction algorithm based on filtered back projection. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/89
Inventor 曾理张伶俐
Owner CHONGQING UNIV
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