Vsevolod Vorobyev1, Alena Shchelokova1, Aleksander Efimtcev1,2, Juan Domingo Baena3, Pavel Belov1, and Stanislav Glybovski1
1ITMO University, Saint-Petersburg, Russian Federation, 2Federal Almazov North-West Medical Research Center, Saint-Petersburg, Russian Federation, 3Universidad Nacional de Colombia, Bogota, Colombia
1ITMO University, Saint-Petersburg, Russian Federation, 2Federal Almazov North-West Medical Research Center, Saint-Petersburg, Russian Federation, 3Universidad Nacional de Colombia, Bogota, Colombia
A novel approach for improving B1+
homogeneity in the abdominal area at 3T MRI is proposed and demonstrated
numerically and experimentally. Results showed the same B1+
homogeneity improvement in the cases of using the metasurface and the conventional
dielectric pad.
Figure 2: Numerical simulation results of the B1+-field
for three cases: (a) the reference case with voxel model only; (b) the
dielectric pad attached on the top of the abdomen; (c) the metasurface attached
on the top of the abdomen.
Figure 4: Experimentally measured MRI scans,
with Body Matrix Coil used as receive coil, of a volunteer for three cases: (a)
the reference case without pads or metasurface; (b) the dielectric pad is
attached on the top of the abdomen; (c) the metasurface is attached on the top
of the abdomen. The imaging parameters for T2-weighted
HASTE sequence: flip angle = 900,
TR/TE = 2000/97 ms, acquisition matrix = 256×179, field-of-view =
306×350 mm2.