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Abstract #2347

Simplifying MR-guided focused ultrasound experiments by using the water bath as an intrinsic high mode dielectric resonator.

Andrew Webb 1

1 Radiology, C.J.Gorter Center for High Field MRI, Leiden, Zuid Holland, Netherlands

The standard setup for MR-guided FUS includes a transducer, water bath integrated into the patient table, and either a specialized RF coil placed close to the patient, or else the body coil is used as the receiver. However, the body coil has low sensitivity and a local RF coil can interfere with ultrasound irradiation. Here a completely new approach is presented in which an RF coil is not needed at all: the dimensions of the water bath are adjusted so that a high order dielectric mode is excited, resulting in efficient MR excitation and reception at the transducer focal point.

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