Automatic motion estimation and compensation framework for weight-bearing C-arm CT scans using fiducial markers

Kerstin Müller, M. Berger, J. H. Choi, A. Maier, R. Fahrig

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

6 Scopus citations

Abstract

Cone-beam CT systems are widely used because of their high flexibility with respect to patient position and scan trajectory. In the last years, C-arm CT systems have been used to acquire images in weight-bearing conditions in order to expose, e.g. the knee joint under realistic loads. Straight standing or squatting patient positions lead to involuntary patient motion during the acquisition. In this paper, a fully-automatic motion estimation and compensation framework to mitigate knee-joint motion during weight-bearing C-arm scans is presented. Our framework consists of three major steps: marker detection with outlier removal, motion estimation and correction, and marker removal. The marker detection is based on an initial estimate of the marker position extracted from the motion-blurred filtered backprojection (FDK) reconstruction and on the fast radial symmetry transformed (FRST) 2-D projection images. The motion is estimated by the alignment of the forward projected 3-D initial marker positions with the actual detected 2-D marker positions. The motion is then corrected in the filtered backprojection step. Finally, the detected markers are removed in the 2-D projection images by simple interpolation. The framework was evaluated on three C-arm CT datasets from one volunteer in a straight standing, moderate squatted and deep squatted position. All 3-D reconstructions show a large improvement in image quality compared to the non-corrected 3-D reconstructions.

Original languageEnglish
Title of host publicationWorld Congress on Medical Physics and Biomedical Engineering, 2015
EditorsDavid A. Jaffray
PublisherSpringer Verlag
Pages58-61
Number of pages4
ISBN (Print)9783319193878
DOIs
StatePublished - 2015
EventWorld Congress on Medical Physics and Biomedical Engineering, 2015 - Toronto, Canada
Duration: 7 Jun 201512 Jun 2015

Publication series

NameIFMBE Proceedings
Volume51
ISSN (Print)1680-0737

Conference

ConferenceWorld Congress on Medical Physics and Biomedical Engineering, 2015
Country/TerritoryCanada
CityToronto
Period7/06/1512/06/15

Bibliographical note

Publisher Copyright:
© Springer International Publishing Switzerland 2015.

Keywords

  • Cone-beam CT
  • Fiducial Markers
  • Image Reconstruction
  • Knee-Joint Imaging
  • Motion Estimation

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