Dual source CT (DSCT) imaging of obese patients: evaluation of CT number accuracy, uniformity, and noise
Proceedings of SPIE(2009)
摘要
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.
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关键词
image quality
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