Xin Chen1 and Michael Steckner1
1Canon Medical Research USA Inc., Mayfield Village, OH, United States
1Canon Medical Research USA Inc., Mayfield Village, OH, United States
Unloaded coil B1+ maps don’t provide
useful information for reducing skin/bore RF burns, are very different vs loaded
B1+ maps, don’t include the B1- contributions, and don’t accurately reflect the
E-field distribution responsible for RF burns.
Figure 1. Duke
at abdomen landmark: a) centered b) shifted to his right side and c) associated unloaded coil B1+ map [uT] at hotspot level shown in Figure 4.
Figure 2. a) the variations in B1+ caused by
loading [log10(loaded B1+ / unloaded B1+)] and b) the associated SAR
map. Both figures are at the coronal level of the SAR hotspot in wrist for Duke
in the central position. The colourbar range in a) only has been truncated
by approximately 50% to magnify colour variations.