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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