Salem Alkhateeb1, Tales Santini2, Tiago Martins2, nadim farhat2, and Tamer S. Ibrahim2
1Bioengineering, University of Pittsburgh, Pittsburgh, PA, United States, 2University of Pittsburgh, Pittsburgh, PA, United States
1Bioengineering, University of Pittsburgh, Pittsburgh, PA, United States, 2University of Pittsburgh, Pittsburgh, PA, United States
A dedicated labeling coil for arterial spin labeling (ASL) technique can alleviate the challenges at 7T MRI, in this work we propose a separate 16-channel RF neck coil for transmit only. Finite-difference time-domain (FDTD) simulations and RF shimming have demonstrated the feasibility of this design to produce a homogeneous B1+ fields in the labeling region (left and right common carotid arteries) while minimizing SAR to within safe limits.
Figure (1), In a) The arrangement of the neck coil alone around the neck of Duke model. In b) Configuration of the single system to be simulated.
Figure (2): Simulation data vs Experimental data. In (a) left, B1 simulation on a shperical phantom using the FDTD software, in (a) right, an actual B1 map from an MRI scanner after implementing the same shim. In (b) left, simulation of tuning and matching of a TTT panel, in (b) right, actual tuning and matching measurements of TTT panel on network analyzer