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X-ray CT multi-phase current inspection based on hereditary algorithm

A genetic algorithm and detection method technology, which is applied in the fields of radiological diagnostic instruments, medical science, computerized tomography scanners, etc., can solve problems such as ECT ill-posedness, reduce completeness requirements, quickly collect projection data, and control discomfort qualitative effect

Inactive Publication Date: 2008-07-23
TSINGHUA UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

For X-CT, when the projection data is incomplete (for example, the projection angle is small), the projection equations are generally discretized into linear equations and then iterative method is used to solve them, which also has the problem of ill-posedness similar to ECT

Method used

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  • X-ray CT multi-phase current inspection based on hereditary algorithm
  • X-ray CT multi-phase current inspection based on hereditary algorithm
  • X-ray CT multi-phase current inspection based on hereditary algorithm

Examples

Experimental program
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Embodiment Construction

[0048] Below in conjunction with example, the concrete implementation of the present invention is described further.

[0049] broken detection system such as figure 2 As shown, the cross-section to be measured is a circular surface with a diameter of 90 mm, that is, the area where the largest circle is located. With the center of the circle as the origin, the x-axis is positive horizontally to the right, and the y-axis is positive vertically upwards. A rectangular coordinate system is established. The unit is mm. The cross-section is composed of air-water two phases: the air phase is distributed in four circles, and the center positions of the circles are (-24, 10), (22, 15), (2, -2) and (-2, -29), The corresponding diameters are 20, 16, 16 and 20 mm; the rest of the area is water.

[0050] 1) Simplify the tested system

[0051] Simplify the air-water two-phase system into a 0-1 binary system, where 0 represents air and 1 represents water.

[0052] 2) Geometrically divide...

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Abstract

A method based on genetic algorithm for detecting the multi-phase flow of computerized X-ray tomography includes such steps as simplifying the system to be detected, geometrically splitting the region to be detected, acquiring the X-ray projection data, discrelizing the X-ray projection equation set, creating actual genetic algorithm for reconstructing image, and converting the numerical solution to the phase / medium distribution gram of the region to be detected. Its advantages are high anti-interference power and high reconstruction fidelity.

Description

technical field [0001] The invention relates to an X-ray CT multiphase flow detection method based on a genetic algorithm, and belongs to the technical field of multiphase flow measurement. Background technique [0002] Medical CT technology has been maturely applied to cross-sectional and stereoscopic imaging research and disease diagnosis of the human body. So far, medical CT has entered the fifth generation of equipment represented by electron beam CT machines. The single projection and tomographic scanning time of the five generations of medical CT machines are shown in the table below. [0003] Single projection and tomographic scanning time of five generations of medical CT machines [0004] Scan time first generation second generation Third Generation Fourth Generation Fifth Generation Single projection(s) 1 1 ～0.001 ～0.25 ＜0.0004 Tomography(s) ～200 ～18 5 1 0.01 [0005] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/02A61B6/03
Inventor 程易吴昌宁丁宇龙金涌魏飞
Owner TSINGHUA UNIV
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