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

J. Eric Tkaczyk; Yanfeng Du; Deborah J. Walter; Xiaoye Wu; Jianying Li; Thomas Toth

doi:10.1117/12.535161

6 May 2004 Simulation of CT dose and contrast-to-noise as function of bowtie shape

J. Eric Tkaczyk, Yanfeng Du, Deborah J. Walter, Xiaoye Wu, Jianying Li, Thomas Toth

Proceedings Volume 5368, Medical Imaging 2004: Physics of Medical Imaging; (2004) https://doi.org/10.1117/12.535161
Event: Medical Imaging 2004, 2004, San Diego, California, United States

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.

Citation Download Citation

J. Eric Tkaczyk, Yanfeng Du, Deborah J. Walter, Xiaoye Wu, Jianying Li, and Thomas Toth "Simulation of CT dose and contrast-to-noise as function of bowtie shape", Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); https://doi.org/10.1117/12.535161

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