Abstract #1047

In vivo MRI with Concurrent Excitation and Acquisition using Dynamic Analog Cancellation with Real-time Feedback

Ali Caglar Özen¹, Jan Korvink², Ergin Atalar³, and Michael Bock¹

¹Deptartment of Radiology, Medical Physics, Medical Center – University of Freiburg, Freiburg, Germany, ²Institute of Microstructure Technology, Karlsruhe Institute of Technology, Karlsruhe, Germany, ³Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey

In this work concurrent excitation and acquisition (CEA) was realized in a clinical MRI system using a fully automated analog cancellation unit to suppress the unwanted transmit signal leakage during acquisition. The cancellation circuit is composed of a voltage-controlled phase shifter and attenuator, which changes phase and amplitude of a small copy of the transmit signal with a real-time feedback from MRI system. 90 dB on-resonant isolation was achieved within 2 s, where an isolation threshold was set to trigger re-adjustment of decoupling parameters when coil loading changes. To demonstrate feasibility, CEA MR data of a phantom and in vivo wrist were acquired.

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