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Abstract #1599

Performance comparison of a 10 cm single-gap vs. double-gap coaxial coil used as a transceiver for 7T MRI

Lena Nohava1,2, Andre Kuehne3, Elmar Laistler1, and Sigrun Roat1
1High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria, 2BioMaps (Laboratoire d'Imagerie Biomédicale Multimodale Paris Saclay), Université Paris-Saclay, CEA, CNRS, Inserm, Orsay, France, 3MRI.TOOLS GmbH, Berlin, Germany

In this work, we investigated the performance differences between a flexible single-gap coaxial coil operated far above self-resonance and a double-gap coaxial coil operated on self-resonance at 7T. Based on electromagnetic simulations and MRI results it is demonstrated that in the single-gap design the current distribution on the outside of the coaxial shield is strongly inhomogeneous. This leads to a strong dependence of the Tx performance on the coil orientation relative to B0. In contrast, the double-gap design results in homogeneous current distribution and orientation-independent Tx performance.

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