Figure 3.

Native sagittal TOF images of subject 3 for B₁⁺ shim settings II, IV and V. A high B₁⁺ magnitude in the frontal brain area for the lowest slab (compare Fig. 2) reduces the static tissue signal for shim IV and introduces a significant intensity change between bottom and middle slab. This was recovered using 3 calibration slices for each TOF slab (setting V) as demonstrated in c). In comparison, a constant shim setting used for all 3 TOF slabs (setting II) avoids intensity variations at the junction of 2 adjacent slabs.