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Introduction Cardiac ventricular volumes are usually assessed using Simpson's rule over short axis (SA) cines of the heart acquired during breath-holds. This technique is challenging for ill patients and segmentation is difficult due to non isotropic resolution. Recently, a new approach was proposed that calculates the ventricle volumes from two nonangulated isotropic cardiac scans of the whole heart (endsystolic, ES, and end-diastolic, ED) (1). However, this approach results in a relatively long overall scan time. To overcome this limitation we propose acquiring the two volumes in one free-breathing scan using quasi independent navigator beams for each cardiac phase. The aim of this study is to evaluate this new acquisition scheme and compare the EDV, ESV and stroke volumes (SV) obtained using this technique with the traditional multiple 2D (M2D) scans and with flow measurements.

141 Volumetric cardiac quantification using three dimensional dual phase whole heart MRI