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Three-dimensional electrical capacitance tomography imaging image reconstruction method

A technology of tomography and image reconstruction, applied in image enhancement, image data processing, 3D image processing, etc.

Active Publication Date: 2016-03-02
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides an image reconstruction method of three-dimensional electrical capacitance tomography, which overcomes the shortcomings of existing methods in suppressing image artifacts, and adopts an adaptive threshold filtering method to suppress artifacts

Method used

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Embodiment 1

[0068] figure 1 A schematic diagram of the structure of the 12-plate sensor is given, in which the plates are distributed in three layers, with 4 plates in each layer, and the layers are rotated 45 degrees. Precompute the normalized sensitivity matrix S and the transpose matrix S of the normalized sensitivity matrix T , the iteration step size α=1.33, q=10, L=64, and the iteration termination condition is 800 iterations. figure 2 middle figure 2 (a), figure 2 (b), figure 2 (c) Three alphabetic complex distribution diagrams are given respectively, image 3 middle image 3 (a), image 3 (b), image 3 (c) respectively for figure 2 middle figure 2 (a), figure 2 (b), figure 2 (c) The image reconstructed by using the reconstruction method of the present invention for the complex distribution of three types of letters.

[0069] Requires a precomputed normalized sensitivity matrix S and the transpose matrix S of the normalized sensitivity matrix T The calculation ...

Embodiment 2

[0085] Figure 4 middle Figure 4 (a), Figure 4 (b), Figure 4 (c) The distribution diagrams of the cylindrical distribution at different positions of the sensor are given respectively, Figure 5 middle Figure 5 (a), Figure 5 (b), Figure 5 (c) respectively for Figure 4 middle Figure 4 (a), Figure 4 (b), Figure 4 (c) Three distributions, images reconstructed by the reconstruction method of the present invention. Other conditions are with embodiment 1.

[0086] Conclusion: The image reconstruction method of 3D electrical capacitance tomography proposed by the present invention can effectively suppress the artifacts of the reconstructed image, improve the imaging quality of complex distribution, and has the advantages of simple calculation and easy programming. In addition to being used in two-phase flow and multiphase flow, electrical capacitance tomography technology has also been applied in many aspects such as skull model temperature distribution imaging, s...

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Abstract

The invention discloses a three-dimensional electrical capacitance tomography (ECT) imaging image reconstruction method which employs the measuring capacitance value obtained by a three-dimensional ECT imaging sensor as the projection data for image reconstruction. In an iteration reconstruction process, a threshold filtering mode is employed to perform artifact inhibition on an obtained reconstruction image; a filtering threshold regularly performs adaptive adjustment, and is selected to minimize the fuzzy measurement of a current image. The method effectively reduces reconstruction image artifacts, improves complexly distributed three-dimensional imaging effects, and realizes real three-dimensional ECT imaging image reconstruction.

Description

technical field [0001] The invention relates to a new image reconstruction method, in particular to a new image reconstruction method for three-dimensional capacitance tomography, belonging to the technical field of capacitance tomography. Background technique [0002] Electrical capacitance tomography (ECT) is a process tomography technology based on the principle of capacitance sensitivity. It obtains the projection data (capacitance value) of the non-conductive measured object field at different observation angles by placing a group of specially designed capacitive sensor arrays around the pipeline or closed container, and uses an appropriate reconstruction algorithm to invert the measured object field The internal medium (dielectric constant) distribution, and the medium distribution results are given in the form of images. It has the advantages of non-invasiveness, fast response, low cost, safety and no radiation. It is the most widely used in two-phase flow and multi...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T15/00
Inventor 王伊凡颜华周英钢孙延辉
Owner SHENYANG POLYTECHNIC UNIV
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