Abstract #0494

Doppler Ultrasound Triggering for Cardiac Magnetic Resonance Imaging at 7 Tesla

Fabian Kording¹, Christian Ruprecht¹, Bjoern Schoennagel¹, Mathias Kladeck Kladeck¹, Jin Yamamura¹, Gerhard Adam¹, Juliane Goebel^2,3, Kai Nassenstein², Stefan Maderwald³, Harald Quick^3,4, and Oliver Kraff³

¹Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg, Hamburg, Germany, ²Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital, University Duisburg-Essen, Essen, Germany, ³Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany, ⁴High Field and Hybrid MR Imaging, University Hospital, University Duisburg-Essen, Essen, Germany, Essen, Germany

Cardiac synchronization for magnetic resonance imaging at ultra-high-field MRI remains a challenge as disturbances in the inherent electrical measurement of the ECG increase with field strength. An ultrasound transducer and transmission line was developed and the feasibility of Doppler Ultrasound as an alternative method for cardiac synchronization was evaluated in terms of safety concerns, signal and image quality. The transmission line and transducer did not disturb the transmit RF field or image homogeneity and were approved for RF safety. Doppler Ultrasound was successfully applied for cardiac synchronization without signal disturbances and represents a promising alternative for ultra-high field CMR.

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