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Proceedings Paper

Dose reduction of up to 89% while maintaining image quality in cardiovascular CT achieved with prospective ECG gating
Author(s): John H. Londt; Uri Shreter; Melissa Vass; Jiang Hsieh; Zhanyu Ge; Olivier Adda; David A. Dowe; Jean-Louis Sabllayrolles
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Paper Abstract

We present the results of dose and image quality performance evaluation of a novel, prospective ECG-gated Coronary CT Angiography acquisition mode (SnapShot Pulse, LightSpeed VCT-XT scanner, GE Healthcare, Waukesha, WI), and compare it to conventional retrospective ECG gated helical acquisition in clinical and phantom studies. Image quality phantoms were used to measure noise, slice sensitivity profile, in-plane resolution, low contrast detectability and dose, using the two acquisition modes. Clinical image quality and diagnostic confidence were evaluated in a study of 31 patients scanned with the two acquisition modes. Radiation dose reduction in clinical practice was evaluated by tracking 120 consecutive patients scanned with the prospectively gated scan mode. In the phantom measurements, the prospectively gated mode resulted in equivalent or better image quality measures at dose reductions of up to 89% compared to non-ECG modulated conventional helical scans. In the clinical study, image quality was rated excellent by expert radiologist reviewing the cases, with pathology being identical using the two acquisition modes. The average dose to patients in the clinical practice study was 5.6 mSv, representing 50% reduction compared to a similar patient population scanned with the conventional helical mode.

Paper Details

Date Published: 13 March 2007
PDF: 12 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65102S (13 March 2007); doi: 10.1117/12.713367
Show Author Affiliations
John H. Londt, GE Healthcare (United States)
Uri Shreter, GE Healthcare (United States)
Melissa Vass, GE Healthcare (United States)
Jiang Hsieh, GE Healthcare (United States)
Zhanyu Ge, GE Healthcare (United States)
Olivier Adda, GE Healthcare (France)
David A. Dowe, Atlantic Medical Imaging (United States)
Jean-Louis Sabllayrolles, Ctr. Cardiologique du Nord (France)

Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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