Abstract #2178

Spherical droplet design and adiabatic excitation for enhanced performance and flip angle control of NMR field probes

Jennifer Nussbaum¹, Simon Gross¹, David O. Brunner¹, Christoph Barmet^1,2, Thomas Schmid¹, Benjamin E. Dietrich¹, Markus Weiger¹, and Klaas P. Pruessmann¹

¹Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland, ²Skope Magnetic Resonance Technologies, Zurich, Switzerland

To measure the spatiotemporal magnetic field evolution during MR procedures for image reconstruction and real-time field control, best field probe performance is desired. We propose improved field probes with 19F spherical droplet samples formed and positioned with gelled deuterium oxide. It is shown that these spherical samples have an isotropic k-space range and thus de-phase less along the capillary than the common probes. Furthermore, with BIR-4 adiabatic plane rotation pulses the flip angle can be perfectly adjusted, opening a new realm of field monitoring methods.

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