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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