A binary image reconstruction technique for accurate determination of the shape and location of metal objects in x-ray computed tomography

Jing Wang, Lei Xing

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The presence of metals in patients causes streaking artifacts in X-ray CT and has been recognized as a problem that limits various applications of CT imaging. Accurate localization of metals in CT images is a critical step for metal artifacts reduction in CT imaging and many practical applications of CT images. The purpose of this work is to develop a method of auto-determination of the shape and location of metallic object(s) in the image space. The proposed method is based on the fact that when a metal object is present in a patient, a CT image can be divided into two prominent components: high density metal and low density normal tissues. This prior knowledge is incorporated into an objective function as the regularization term whose role is to encourage the solution to take a form of two intensity levels. A computer simulation study and four experimental studies are performed to evaluate the proposed approach. Both simulation and experimental studies show that the presented algorithm works well even in the presence of complicated shaped metal objects. For a hexagonally shaped metal embedded in a water phantom, for example, it is found that the accuracy of metal reconstruction is within sub-millimeter.

Original languageEnglish (US)
Pages (from-to)403-414
Number of pages12
JournalJournal of X-Ray Science and Technology
Volume18
Issue number4
DOIs
StatePublished - 2010

Fingerprint

Computer-Assisted Image Processing
Binary images
image reconstruction
Image reconstruction
Tomography
tomography
Metals
X-Rays
X rays
metals
x rays
Artifacts
artifacts
Imaging techniques
X Ray Computed Tomography
Computer Simulation
computerized simulation
Tissue
Water
causes

Keywords

  • and iterative image reconstruction
  • Computed tomography
  • gradient-controlled penalty
  • metal artifacts

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics
  • Radiation
  • Electrical and Electronic Engineering
  • Instrumentation

Cite this

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abstract = "The presence of metals in patients causes streaking artifacts in X-ray CT and has been recognized as a problem that limits various applications of CT imaging. Accurate localization of metals in CT images is a critical step for metal artifacts reduction in CT imaging and many practical applications of CT images. The purpose of this work is to develop a method of auto-determination of the shape and location of metallic object(s) in the image space. The proposed method is based on the fact that when a metal object is present in a patient, a CT image can be divided into two prominent components: high density metal and low density normal tissues. This prior knowledge is incorporated into an objective function as the regularization term whose role is to encourage the solution to take a form of two intensity levels. A computer simulation study and four experimental studies are performed to evaluate the proposed approach. Both simulation and experimental studies show that the presented algorithm works well even in the presence of complicated shaped metal objects. For a hexagonally shaped metal embedded in a water phantom, for example, it is found that the accuracy of metal reconstruction is within sub-millimeter.",
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