Volume of interest CT implemented with a dynamic bowtie filter

Timothy P. Szczykutowicz; Charles Mistretta

doi:10.1117/12.2005924

19 March 2013 Volume of interest CT implemented with a dynamic bowtie filter

Timothy P. Szczykutowicz, Charles Mistretta

Proceedings Volume 8668, Medical Imaging 2013: Physics of Medical Imaging; 86682R (2013) https://doi.org/10.1117/12.2005924
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States

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.

Citation Download Citation

Timothy P. Szczykutowicz and Charles Mistretta "Volume of interest CT implemented with a dynamic bowtie filter", Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 86682R (19 March 2013); https://doi.org/10.1117/12.2005924

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