Christopher Joseph Wargo1, Marcin Jankiewicz1,
Huairen Zeng1, John C. Gore1
1Vanderbilt University Institute of
Imaging Science, Nashville, TN, United States
Arbitrarily
shaped volume excitation has a variety of potential MRI applications. By restricting the FOX, the information
obtained is isolated to particular anatomical or functional regions. Faster acquisitions can also be enabled for
high resolutions due to fewer collected points. To accomplish this, multi-pulse composites
can be applied at various excitation k-space points, with simulations used to
define RF and gradient waveforms for a specific desired excitation pattern.
B1 inhomogeneity effects, prevalent at ultra-high field strengths such as 7T,
can also be accounted for. Here we
demonstrate the performance of a SPOKE based arbitrary shape excitation at 7T
in phantoms.