1ICT, University of Applied Science and Technology, Tehran, Iran, 2Nuclear Engineering, Shahid Beheshti, Tehran, Iran
MR micro coils provide high SNR images of the
mass limited samples. To increase the coil sensitivity and then the image SNR,
microcoils geometries are adapted to the sample dimension. However,
differences between magnetic susceptibility of the coil conductor and its
surrounding materials distorts the B0 magnetic fields homogeneity across the
sample. In this study, we measured 2D
maps of
a solenoid of 1mm diameter and compared them with the simulated results at 9.4 T. Considering the good agreement of the computed and measured maps,
effects of the shimming and susceptibility matching
processes were assessed in removing the B0 fields inhomogeneities. Simulated results verify that
shimming coils are not able to fully cancel the B0 field inhemogenities but
embedding the micro coils in susceptible materials will remove the B0 inhomogeneity completely.
