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Abstract #0314

Successful body imaging at 7 Tesla: The Fractionated Dipole Antenna

Alexander J.E. Raaijmakers 1 , Dennis W.J. Klomp 1 , Fredy Visser 1,2 , Hans Hoogduin 3 , Peter R. Luijten 1 , and Cornelis A.T. van den Berg 4

1 Radiology, UMC Utrecht, Utrecht, Utrecht, Netherlands, 2 Philips Healthcare, Best, Netherlands, 3 Brain Division, UMC Utrecht, Utrecht, Netherlands, 4 Radiotherapy, UMC Utrecht, Utrecht, Utrecht, Netherlands

Dipole antennas are emerging rapidly in the UHF community. In antenna theory, Poynting vector and wave impedance play an important role. Following these concepts, we found that dipole antenna performance can be enhanced by dividing the legs in segments and interconnecting these segments by inductors. In this setup, the required inductors are realized by meanders. The resulting elements we call fractionated dipole antennas. These elements provide good B1 efficiency with low SAR levels. An array of 8 of these elements has been constructed. With this array, impressive image quality has been obtained for prostate, kidneys and coronary arteries.

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