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Ultrahigh-field MRI whole-slice and localized RF field excitations using the same RF transmit array

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1 Author(s)
T. S. Ibrahim ; Sch. of Electr. & Comput. Eng., Pittsburgh Univ., PA, USA

In this paper, a multiport driving mechanism is numerically implemented at ultra high-field (UHF) magnetic resonance imaging (MRI) to provide 1) homogenous whole-slice (axial, sagittal, or coronal) and 2) highly localized radio frequency (RF) field excitation within the same slices, all with the same RF transmit array (here chosen to be a standard transverse electromagnetic (TEM) resonator/coil). The method is numerically tested using a full-wave model of a TEM coil loaded with a high-resolution/18-tissue/anatomically detailed human head mesh. The proposed approach is solely based on electromagnetic and phased array antenna theories. The results demonstrate that both homogenous whole-slice as well as localized RF excitation can be achieved within any slice of the head at 7 T (298 MHz for proton imaging)

Published in:

IEEE Transactions on Medical Imaging  (Volume:25 ,  Issue: 10 )