Dual source CT (DSCT) imaging of obese patients: evaluation of CT number accuracy, uniformity, and noise

A. Walz-Flannigan; B, Schmidt; A. Apel; C. Eusemann; L. Yu; C. H. McCollough

doi:10.1117/12.813737

13 March 2009 Dual source CT (DSCT) imaging of obese patients: evaluation of CT number accuracy, uniformity, and noise

A. Walz-Flannigan, B, Schmidt, A. Apel, C. Eusemann, L. Yu, C. H. McCollough

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72585N (2009) https://doi.org/10.1117/12.813737
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

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.

Citation Download Citation

A. Walz-Flannigan, B, Schmidt, A. Apel, C. Eusemann, L. Yu, and C. H. McCollough "Dual source CT (DSCT) imaging of obese patients: evaluation of CT number accuracy, uniformity, and noise", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72585N (13 March 2009); https://doi.org/10.1117/12.813737

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KEYWORDS

X-ray computed tomography

Polymethylmethacrylate

X-rays

Sensors

Image quality

Imaging systems

X-ray imaging

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