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Proceedings Paper

Dual source CT (DSCT) imaging of obese patients: evaluation of CT number accuracy, uniformity, and noise
Author(s): A. Walz-Flannigan; B, Schmidt; A. Apel; C. Eusemann; L. Yu; C. H. McCollough
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Paper Abstract

Obese patients present challenges in obtaining sufficient x-ray exposure over reasonable time periods for acceptable CT image quality. To overcome this limitation, the exposure can be divided between two x-ray sources using a dualsource (DS) CT system. However, cross-scatter issues in DS CT may also compromise image quality. We evaluated a DS CT system optimized for imaging obese patients, comparing the CT number accuracy and uniformity to the same images obtained with a single-source (SS) acquisition. The imaging modes were compared using both solid cylindrical PMMA phantoms and a semi-anthropomorphic thorax phantom fitted with extension rings to simulate different size patients. Clinical protocols were used and CTDIvol and kVp were held constant between SS and DS modes. Results demonstrated good agreement in CT number between SS and DS modes in CT number, with the DS mode showing better axial uniformity for the largest phantoms.

Paper Details

Date Published: 13 March 2009
PDF: 11 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72585N (13 March 2009); doi: 10.1117/12.813737
Show Author Affiliations
A. Walz-Flannigan, Mayo Clinic (United States)
B, Schmidt, Siemens Healthcare (Germany)
A. Apel, Siemens Healthcare (Germany)
C. Eusemann, Siemens Healthcare (Germany)
L. Yu, Mayo Clinic (United States)
C. H. McCollough, Mayo Clinic (United States)


Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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