Abstract #0836

Faster fetal whole-heart anatomical and blood flow 4D cine MRI with k-t SWEEP

Thomas A Roberts¹, Laurence H Jackson¹, Joshua FP van Amerom², Alena Uus¹, Anthony N Price¹, Johannes K Steinweg¹, David FA Lloyd^1,3, Milou PM van Poppel¹, Kuberan Pushparajah³, Mary A Rutherford¹, Reza Razavi^1,3, Maria Deprez¹, and Joseph V Hajnal¹

¹Biomedical Engineering Department, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, ²Division of Pediatric Cardiology, The Hospital for Sick Children, Toronto, ON, Canada, ³Department of Congenital Heart Disease, Evelina Children's Hospital, London, United Kingdom

MRI of the fetal heart is challenging due to fetal motion and its small size. Previously, we have demonstrated a method for simultaneous 4D anatomical and blood flow imaging of the whole fetal heart. However, the acquisition takes at least 14 minutes, which is unfavourable for routine clinical usage. Here, we combine k-t SENSE with SWEEP excitation to acquire a continuous sequence of images through the heart. The removal of dummy pulses due to SWEEP excitation reduces our acquisition time by 17%. We also acquire one-third fewer frames compared to our conventional method, resulting in a 45% faster acquisition time.

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