
Proceedings Paper
3D-guided CT reconstruction using time-of-flight cameraFormat | Member Price | Non-Member Price |
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Paper Abstract
We propose the use of a time-of-flight (TOF) camera to obtain the patient's body contour in 3D guided imaging
reconstruction scheme in CT and C-arm imaging systems with truncated projection. In addition to pixel intensity, a TOF
camera provides the 3D coordinates of each point in the captured scene with respect to the camera coordinates.
Information from the TOF camera was used to obtain a digitized surface of the patient's body. The digitization points are
transformed to X-Ray detector coordinates by registering the two coordinate systems. A set of points corresponding to
the slice of interest are segmented to form a 2D contour of the body surface. Radon transform is applied to the contour to
generate the 'trust region' for the projection data. The generated 'trust region' is integrated as an input to augment the
projection data. It is used to estimate the truncated, unmeasured projections using linear interpolation. Finally the image
is reconstructed using the combination of the estimated and the measured projection data. The proposed method is
evaluated using a physical phantom. Projection data for the phantom were obtained using a C-arm system. Significant
improvement in the reconstructed image quality near the truncation edges was observed using the proposed method as
compared to that without truncation correction. This work shows that the proposed 3D guided CT image reconstruction
using a TOF camera represents a feasible solution to the projection data truncation problem.
Paper Details
Date Published: 1 March 2011
PDF: 11 pages
Proc. SPIE 7964, Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling, 796429 (1 March 2011); doi: 10.1117/12.878881
Published in SPIE Proceedings Vol. 7964:
Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling
Kenneth H. Wong; David R. Holmes III, Editor(s)
PDF: 11 pages
Proc. SPIE 7964, Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling, 796429 (1 March 2011); doi: 10.1117/12.878881
Show Author Affiliations
Mahmoud Ismail, Johns Hopkins Univ. (United States)
Katsuyuki Taguchi, Johns Hopkins Medical Institute (United States)
Jingyan Xu, Johns Hopkins Medical Institute (United States)
Katsuyuki Taguchi, Johns Hopkins Medical Institute (United States)
Jingyan Xu, Johns Hopkins Medical Institute (United States)
Benjamin M. W. Tsui, Johns Hopkins Medical Institute (United States)
Emad M. Boctor, Johns Hopkins Univ. (United States)
Johns Hopkins Medical Institute (United States)
Emad M. Boctor, Johns Hopkins Univ. (United States)
Johns Hopkins Medical Institute (United States)
Published in SPIE Proceedings Vol. 7964:
Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling
Kenneth H. Wong; David R. Holmes III, Editor(s)
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