Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Cone-beam CT beam hardening calibration method based on registration model emulation

A beam hardening correction and registration model technology, which is applied in the fields of material analysis, image data processing, and instruments using radiation, can solve the problems of inflexible application and ineffective application of cone beam CT, etc., and achieve beam hardening artifacts Reduced effect

Inactive Publication Date: 2008-02-20
NORTHWESTERN POLYTECHNICAL UNIV
View PDF0 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the existing technology that is not flexible enough to be applied effectively to cone beam CT, the present invention provides a new method for beam hardening correction of cone beam CT based on registration model simulation, so as to apply cone beam CT to the actual non-destructive Effectively correct for beam hardening problems that occur during inspections

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cone-beam CT beam hardening calibration method based on registration model emulation
  • Cone-beam CT beam hardening calibration method based on registration model emulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] For a detected cylindrical part made of iron, apply the method of the present invention to correct its cone-beam CT beam hardening artifact, and perform the following steps:

[0026] (1) Carry out a circular trajectory cone beam CT scan on the detected part, and the part is continuously rotated 360 degrees, and a set of continuous 360 pieces of multi-color projection image data are obtained from the PaxScan2520 flat panel detector of Varian Company. These images have been used in the acquisition process The flat panel detector manufacturer's supporting program performs necessary dark field correction, bad pixel correction and gain correction;

[0027] (2) Using the FDK algorithm to reconstruct partial slices of cone-beam CT on polychromatic projection, reconstruct 10 CT slice images at different positions along the axis of the cylindrical part;

[0028] (3) Using the OTSU algorithm in digital image processing to extract the contours of the reconstructed 10 CT slice imag...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The utility model discloses a beam hardening correction method of cone beam CT based on registration model simulation, which acquires multi-color projection data through circle locus cone beam CT scanning to a spare part. After acquiring CT images of sequence slices by cone beam CT reconstitution to the multi-color projection, the contour of certain pieces of the images are extracted so that a measurement point formed a plurality of closed contour lines is acquired. Projection simulation is processed after the registration of the measurement point and the CAD model of the part, and then the length of the part passing through the part at every imaging point is acquired. A hardening curve that passes through the original point is acquired by nonlinear fitting and a straight line that passes through the original point is acquired by linear fitting. The beam hardening constructed defect of the cone beam CT is corrected according to the hardening curve and the rectifying straight line. The utility model is flexible in application, and can approximately corrected through multi-color projection to unique color projection, and the beam hardening artifacts is reduced obviously after correction.

Description

technical field [0001] The invention relates to a cone-beam CT beam hardening correction method, which belongs to the technical field of CT. Background technique [0002] Cone-Beam Computed Tomography (CBCT) uses a cone-beam ray source and an area array detector to collect projection data of the measured object. It is a three-dimensional CT technology developed in recent years. Compared with traditional two-dimensional CT, cone-beam CT has a very high scanning speed, and the reconstructed slice images record the distribution of physical parameters such as material and density of each point inside the object, and have continuous slice sequence, intra-slice and inter-slice With the characteristics of the same spatial resolution and high precision, it has shown broad application and development prospects in the fields of reverse engineering and industrial internal vision. [0003] In the cone-beam CT system, the X-rays emitted by the ray source have a certain range of energy d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04G06T5/00G06T1/00
Inventor 张定华黄魁东卜昆王凯
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com