Table 2.

Magnetic field homogenization of a central 12 mm thick slab of the in vivo rat brain at 11.7 Tesla with different shimming techniques. Theoretical shimming including various spherical harmonic (SH) orders was applied statically and dynamically assuming unlimited amplitude range. DYNAMITE shimming was based on experimentally calibrated basis fields with the presented MC-RF setup including a ±1 A current limitation on all MC channels. The average standard deviation (mean ± SD) of the magnetic field distributions in 12 rat brains after shimming is reported.

uncorrected	136 ± 20 Hz
static SH 1st	69 ± 8 Hz
static SH 2nd	61 ± 11 Hz
static SH 3rd	52 ± 7 Hz
static SH 4th	44 ± 8 Hz
static SH 5th	38 ± 7 Hz
SH-DSU 1st	42 ± 4 Hz
SH-DSU 2nd	33 ± 4 Hz
SH-DSU 3rd	27 ± 3 Hz
SH-DSU 4th	22 ± 3 Hz
static MC shim	40 ± 5 Hz
DYNAMITE shim	17 ± 3 Hz