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Proceedings Paper

3D iterative full and half scan reconstruction in CT architectures with distributed sources
Author(s): M. Iatrou; B. De Man; D. Beque; Z. Yin; K. Khare; T. M. Benson
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Paper Abstract

In 3rd generation CT systems projection data, generated by X-rays emitted from a single source and passing through the imaged object, are acquired by a single detector covering the entire field of view (FOV). Novel CT system architectures employing distributed sources [1,2] could extend the axial coverage, while removing cone-beam artifacts and improving spatial resolution and dose. The sources can be distributed in plane and/or in the longitudinal direction. We investigate statistical iterative reconstruction of multi-axial data, acquired with simulated CT systems with multiple sources distributed along the in-plane and longitudinal directions. The current study explores the feasibility of 3D iterative Full and Half Scan reconstruction methods for CT systems with two different architectures. In the first architecture the sources are distributed in the longitudinal direction, and in the second architecture the sources are distributed both longitudinally and trans-axially. We used Penalized Weighted Least Squares Transmission Reconstruction (PWLSTR) and incorporated a projector-backprojector model matching the simulated architectures. The proposed approaches minimize artifacts related to the proposed geometries. The reconstructed images show that the investigated architectures can achieve good image quality for very large coverage without severe cone-beam artifacts.

Paper Details

Date Published: 18 March 2008
PDF: 10 pages
Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 691322 (18 March 2008); doi: 10.1117/12.772976
Show Author Affiliations
M. Iatrou, GE Research (United States)
B. De Man, GE Research (United States)
D. Beque, GE Research (Germany)
Z. Yin, GE Research (United States)
K. Khare, GE Research (United States)
T. M. Benson, GE Research (United States)

Published in SPIE Proceedings Vol. 6913:
Medical Imaging 2008: Physics of Medical Imaging
Jiang Hsieh; Ehsan Samei, Editor(s)

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