Meeting Banner
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.

This abstract and the presentation materials are available to members only; a login is required.

Join Here