13 March 2007 Dose reduction of up to 89% while maintaining image quality in cardiovascular CT achieved with prospective ECG gating
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Proceedings Volume 6510, Medical Imaging 2007: Physics of Medical Imaging; 65102S (2007); doi: 10.1117/12.713367
Event: Medical Imaging, 2007, San Diego, CA, United States
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.
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John H. Londt, Uri Shreter, Melissa Vass, Jiang Hsieh, Zhanyu Ge, Olivier Adda, David A. Dowe, Jean-Louis Sabllayrolles, "Dose reduction of up to 89% while maintaining image quality in cardiovascular CT achieved with prospective ECG gating", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65102S (13 March 2007); doi: 10.1117/12.713367; https://doi.org/10.1117/12.713367
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KEYWORDS
Heart

Image quality

Electrocardiography

Modulation

Image resolution

Beam propagation method

Diagnostics

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