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Proceedings Paper

Cone-angle-dependent generalized weighting scheme for 16-slice helical CT
Author(s): Jiang Hsieh; Yanting Dong; Piero Simoni; Thomas Toth; Christopher L. Slack; Brian Grekowicz; George Seidenschnur; Charlie Shaughnessy
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Paper Abstract

Since the recent introduction of multi-slice helical computed tomography (MHCT), new clinical applications have experienced tremendous growth in recent years. MHCT offers improved volume coverage, faster scan speed, more isotropic spatial resolution, and reduced x-ray tube loading. Similar to the single slice helical CT, the projection data collected in MHCT is inherently inconsistent due to the constant table motion. In addition, cone beam effects in MHCT produce additional complexity and image artifacts. Although the cone angle is quite smaller even for the 16-slice configuration, the impact on image artifacts cannot be ignored. Many reconstruction algorithms have been proposed and investigated recently to combat image artifacts associated with the MHCT data acquisition. In this paper, we propose a cone-angle dependent generalized weighting scheme for 16-slice helical CT that allows the production of MHCT images with only 2D backprojection. The cone-angle dependency of the algorithm suppresses image artifacts due to the cone beam effect and the generalized weighting portion enables interpolation be performed with conjugate samples for the 16-slice helical dataset. With the proposed algorithm, image artifacts are significantly reduced.

Paper Details

Date Published: 9 May 2002
PDF: 8 pages
Proc. SPIE 4684, Medical Imaging 2002: Image Processing, (9 May 2002); doi: 10.1117/12.467219
Show Author Affiliations
Jiang Hsieh, GE Medical Systems (United States)
Yanting Dong, Duke Univ. (United States)
Piero Simoni, GE Medical Systems (United States)
Thomas Toth, GE Medical Systems (United States)
Christopher L. Slack, GE Medical Systems (United States)
Brian Grekowicz, GE Medical Systems (United States)
George Seidenschnur, GE Medical Systems (United States)
Charlie Shaughnessy, GE Medical Systems (United States)

Published in SPIE Proceedings Vol. 4684:
Medical Imaging 2002: Image Processing
Milan Sonka; J. Michael Fitzpatrick, Editor(s)

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