Share Email Print

Proceedings Paper

Volume of interest CT implemented with a dynamic bowtie filter
Author(s): Timothy P. Szczykutowicz; Charles Mistretta
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Often in clinical CT imaging situations, a clinician only requires a small volume of interest (VOI) within aCT slice to be imaged. Unfortunately, due to some fundamental constraints in CT image reconstruction, the entire slice must be irradiated even when a small VOI is all that is clinically required. This produces excess dose for the patient, excess scatter which degrades image quality and increases clinician dose, and may effect patient care because clinicians may limit their use of CT in the interventional setting due to the previous two factors. This paper shows experimental results in which a digital beam attenuator (DBA) is used to modulate the patient dose as a function of view and gantry angle to enhance the SNR in a small VOI relative to the surrounding areas. It was found that the noise was lower by 50% inside the VOI for DBA enabled VOL This promising result was obtained while providing an incident fluence reduction of 13 times on average for all regions not corresponding to the VOI relative to a non-VOI scan.

Paper Details

Date Published: 19 March 2013
PDF: 7 pages
Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 86682R (19 March 2013); doi: 10.1117/12.2005924
Show Author Affiliations
Timothy P. Szczykutowicz, Univ. of Wisconsin-Madison (United States)
Charles Mistretta, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 8668:
Medical Imaging 2013: Physics of Medical Imaging
Robert M. Nishikawa; Bruce R. Whiting; Christoph Hoeschen, Editor(s)

© SPIE. Terms of Use
Back to Top