X-ray CT high-density artefact suppression in the presence of bones

Jikun Wei, Laigao Chen, George A. Sandison, Yun Liang, Lisa X. Xu

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

This paper presents a novel method of reducing x-ray CT high-density artefacts generated by metal objects when abundant bone structures are present in the region of interest. This method has an advantage over previously proposed methods since it heavily suppresses the metal artefacts without introducing extra bone artefacts. The method of suppression requires that bone pixels are isolated and segmented by thresholding. Then artificial CT numbers are assigned to the bone pixels so that their projection profiles are smooth and thus can be properly simulated by a polynomial interpolation. The projection profile of the metal object is then removed to fully suppress the artefacts. The resulting processed profile is fed to a reconstruction routine and the previously preserved bone pixels added back. The new method utilizes two important features of the CT image with metal artefacts: (a) metal and bone pixels are not severely affected by the high-density artefacts and (b) the high-density artefacts can be located in specific projection channels in the profile domain, although they are spread out in the image domain. This suppression method solves the problem of CT image artefacts arising from metal objects in the body. It has the potential to greatly improve diagnostic CT imaging in the presence of these objects and treatment planning that utilizes CT for patients with metal applicators (e.g., brachytherapy for cervix cancer and prostate cryotherapy).

Original languageEnglish
Pages (from-to)5407-5418
Number of pages12
JournalPhysics in Medicine and Biology
Volume49
Issue number24
DOIs
StatePublished - Dec 21 2004

Fingerprint

X Ray Computed Tomography
Artifacts
bones
artifacts
Bone
retarding
Metals
Bone and Bones
X rays
Pixels
metals
x rays
pixels
projection
profiles
Cryotherapy
Applicators
Brachytherapy
Diagnostic Imaging
Uterine Cervical Neoplasms

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physics and Astronomy (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

X-ray CT high-density artefact suppression in the presence of bones. / Wei, Jikun; Chen, Laigao; Sandison, George A.; Liang, Yun; Xu, Lisa X.

In: Physics in Medicine and Biology, Vol. 49, No. 24, 21.12.2004, p. 5407-5418.

Research output: Contribution to journalArticle

Wei, Jikun ; Chen, Laigao ; Sandison, George A. ; Liang, Yun ; Xu, Lisa X. / X-ray CT high-density artefact suppression in the presence of bones. In: Physics in Medicine and Biology. 2004 ; Vol. 49, No. 24. pp. 5407-5418.
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