Abstract #1317
A Double-Row Transmit Array with Broadband Sheath-Wave Damping for 7T Human Head Imaging
Roland Mller 1 , Andreas Schfer 1 , Debra S. Rivera 1 , Robert Turner 1 , and Harald E. Mller 1
1
Max Planck Institute for Human Cognitive and
Brain Sciences, Leipzig, Germany
Goal of the project was to design an eight-element,
double-row, transmit RF array coil for imaging of human
heads at 7T. Both rows should be tuned independently
using the reflected power minimization approach. At high
fields, the common mode problem is presenting a source
of loss as well as a potential safety issue. This was
addressed by a PCB based 3D coil structure. The
combination of balanced feeding, balanced feed lines and
resistor-bypassed line shield gaps was sufficient to
eliminate sheath waves and hand effects. No conventional
traps were required. A good longitudinal coverage of B1+
field can be shown.
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