A Fast and Robust Calibration Method for Geometric Parameters of Cone-beam CT

Hua Zhang, Caixin Zhang, Dinghua Zhang, Yin Dong, Taoqi Chang, Kuidong Huang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

At present, the cone-beam CT (CBCT) technology has been widely used in biomedical and non-destructive testing. The calibration of the geometric parameters of CBCT is the prerequisite for accurate image reconstruction. Inaccurate geometric parameters can lead to artifacts in reconstructed CBCT images and reduce the image quality. In order to obtain the geometric parameters of CBCT quickly and reliably, a calibration method for geometric parameters based on wire scanning is proposed in this paper. Firstly, a simple calibration tool is designed. Its basic structure is metal filament embedded in plexiglass tube. And then obtain a small amount of projections of the calibration tool with a single circular trajectory scanning, and superimpose the scanned projections. The coordinate of the beam center can be obtained by performing rotational axis fitting based on the symmetrical characteristics of the superimposed projection. After that, collect the projection after the calibration tool moves a certain distance, the distance between the focus and the rotation center, and the distance from the focus to the detector, are calculated according to the corresponding geometric relation of the calibration tool diameter and its projection. The simulation results and actual scan results show that the method can obtain the accurate geometric parameters of CBCT, which has the characteristics of a small amount of scanning, fast calibration speed and strong robustness. And it has been successfully applied in small focus CBCT and micro focus CBCT.

Original languageEnglish
Title of host publicationProceedings of the International MultiConference of Engineers and Computer Scientists 2017, IMECS 2017
EditorsOscar Castillo, Craig Douglas, S. I. Ao, David Dagan Feng, A. M. Korsunsky
PublisherNewswood Limited
Pages381-385
Number of pages5
ISBN (Electronic)9789881404732
StatePublished - 2017
Event2017 International MultiConference of Engineers and Computer Scientists, IMECS 2017 - Hong Kong, Hong Kong
Duration: 15 Mar 201717 Mar 2017

Publication series

NameLecture Notes in Engineering and Computer Science
Volume2227
ISSN (Print)2078-0958

Conference

Conference2017 International MultiConference of Engineers and Computer Scientists, IMECS 2017
Country/TerritoryHong Kong
CityHong Kong
Period15/03/1717/03/17

Keywords

  • Calibration
  • Cone-beam CT
  • Edge detection
  • Geometric parameters

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