Christopher W. Roy1,
Mike Seed2, 3, Joshua F. P. van Amerom1,
3, Bahiyah Al Nafisi2, Lars Grosse-Wortmann2,
3, Shi-Joon Yoo2, 3, Christopher K. Macgowan1,
3
1Medical
Biophysics and Medical Imaging, University of Toronto, Toronto, Ontario,
Canada; 2Labatt Family Heart Centre, Division of Cardiology,
Department of Paediatrics, The Hospital for Sick Children, Toronto, Ontario,
Canada; 3Diagnostic Imaging, The Hospital for Sick Children,
University of Toronto
A metric-based image reconstruction method is developed and validated for CINE MR imaging of the fetal heart. This method, known as metric optimized gating (MOG), is adapted from a previous study of fetal blood flow. It involves oversampling k-space and then reconstructing images according to an iterative model of the subject’s cardiac cycle. Image quality is optimized through the minimization of an image metric (entropy). Here, the approach is validated in healthy adult volunteers through qualitative and quantitative comparison to gold standard ECG gating. Dynamic CINE images of a normal fetal heart are presented.