|ECR 2013 / C-0595|
|A new method for radiation dose reduction at cardiac CT with multi-phase data-averaging and non-rigid image registration: preliminary clinical trial|
In coronary computed tomography angiography (CTA), prospective ECG triggering scanning can be used in patients with a stable sinus rhythm and a low heart rate [1, 2]. In this technique, the CT scan is usually performed at the center of the mid-diastole phase at around 75% of the R-R interval . As the best phase for diagnosis varies from patient to patient, redundant scan data (padding) centered on mid-diastole are usually acquired [3, 4]. A final image for evaluation of the coronary arteries is reconstructed by selecting the phase with the fewest motion artifacts; data reconstructed from another phase are not used for diagnosis.
We introduce a new method for image noise reduction at coronary CTA that uses the multi-phase images reconstructed from unused redundant scan data. It reduces image noise by averaging multi-phase images transformed by non-rigid image registration. The purpose of our study was to investigate the clinical feasibility of our noise reduction technique at coronary CTA.
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