Water-Immersed 8-Dipole Receive Array for MR-Guided Focused Ultrasound of the Brain at 3T
Adam Mitchell Maunder1,2, Samuel Pichardo3, G. Bruce Pike3, Melany Mclean3, Fraser Robb4, Ashwin Iyer2, and Nicola De Zanche1,5
1Oncology, University of Alberta, Edmonton, AB, Canada, 2Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada, 3Departments of Radiology and Clinical Neurosciences, Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada, 4GE Healthcare Inc., Aurora, OH, United States, 5Medical Physics, Cross Cancer Institute, Edmonton, AB, Canada
The piezoelectric transducer array in magnetic resonance guided focused ultrasound shields the RF body-sized birdcage (BC) fields, leading to regions of low receive sensitivity that hinder MR thermometry and structural imaging. This work presents a flexible, acoustically transparent receive array consisting of dipole sections that mimic loops and are contained within the water bath of the ultrasound transducer array helmet surrounding the head. Adjacent elements are decoupled by shared current paths and lumped inductors. In simulation, the receive sensitivity is increased by 7.8-fold compared to a BC and causes a negligible alteration of the transmit field and specific absorption rate.
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