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Proceedings Paper

Simulation of CT dose and contrast-to-noise as function of bowtie shape
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Paper Abstract

Dose is becoming increasingly important for computed tomography clinical practice. It is of general interest to understand the impact that system design can have on dose and image quality. This study addresses the effect of bowtie shape on the dose and contrast-to-noise across the field of view. Simulation of the CT acquisition is used to calculate the energy deposition throughout a numerical phantom for a set of relevant system operating parameters and bowtie shapes. Mean absorbed dose is calculated by summing over the phantom volume and is compared with other typical dose specifications. A more aggressive attenuation profile of the bowtie which offers higher attenuation in the periphery of the field of view can offer the benefit of lower dose but at the expense of reduced contrast-to-noise at the edge of the cross-sectional image.

Paper Details

Date Published: 6 May 2004
PDF: 8 pages
Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); doi: 10.1117/12.535161
Show Author Affiliations
J. Eric Tkaczyk, GE Global Research Ctr. (United States)
Yanfeng Du, GE Global Research Ctr. (United States)
Deborah J. Walter, GE Global Research Ctr. (United States)
Xiaoye Wu, GE Global Research Ctr. (United States)
Jianying Li, General Electric Medical Systems (United States)
Thomas Toth, General Electric Medical Systems (United States)


Published in SPIE Proceedings Vol. 5368:
Medical Imaging 2004: Physics of Medical Imaging
Martin J. Yaffe; Michael J. Flynn, Editor(s)

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