Abstract #1087

Water-Immersed 8-Dipole Receive Array for MR-Guided Focused Ultrasound of the Brain at 3T

Adam Mitchell Maunder^1,2, Samuel Pichardo³, G. Bruce Pike³, Melany Mclean³, Fraser Robb⁴, Ashwin Iyer², and Nicola De Zanche^1,5

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

Synopsis

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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