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Proceedings Paper

Breathing motion compensated reconstruction for C-arm cone beam CT imaging: initial experience based on animal data
Author(s): D. Schäfer; M. Lin; P. P. Rao; R. Loffroy; E. Liapi; N. Noordhoek; P. Eshuis; A. Radaelli; M. Grass; J.-F. H. Geschwind
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Paper Abstract

C-arm based tomographic 3D imaging is applied in an increasing number of minimal invasive procedures. Due to the limited acquisition speed for a complete projection data set required for tomographic reconstruction, breathing motion is a potential source of artifacts. This is the case for patients who cannot comply breathing commands (e.g. due to anesthesia). Intra-scan motion estimation and compensation is required. Here, a scheme for projection based local breathing motion estimation is combined with an anatomy adapted interpolation strategy and subsequent motion compensated filtered back projection. The breathing motion vector is measured as a displacement vector on the projections of a tomographic short scan acquisition using the diaphragm as a landmark. Scaling of the displacement to the acquisition iso-center and anatomy adapted volumetric motion vector field interpolation delivers a 3D motion vector per voxel. Motion compensated filtered back projection incorporates this motion vector field in the image reconstruction process. This approach is applied in animal experiments on a flat panel C-arm system delivering improved image quality (lower artifact levels, improved tumor delineation) in 3D liver tumor imaging.

Paper Details

Date Published: 3 March 2012
PDF: 6 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83131D (3 March 2012); doi: 10.1117/12.909914
Show Author Affiliations
D. Schäfer, Philips Research (Germany)
M. Lin, Philips Research North America (United States)
John Hopkins Univ. School of Medicine (United States)
P. P. Rao, The Johns Hopkins Univ. School of Medicine (United States)
R. Loffroy, The Johns Hopkins Univ. School of Medicine (United States)
E. Liapi, The Johns Hopkins Univ. School of Medicine (United States)
N. Noordhoek, Philips Healthcare (Netherlands)
P. Eshuis, Philips Healthcare (Netherlands)
A. Radaelli, Philips Healthcare (Netherlands)
M. Grass, Philips Research (Germany)
J.-F. H. Geschwind, The Johns Hopkins Univ. School of Medicine (United States)


Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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