Figure 4.

Phantom results using the 3D UTE-Cones-AFI technique and an 8-channel knee coil. The first two columns show dual-TR UTE-Cones images (left: first TR images; right: second TR images) of an agarose phantom and an agarose bone phantom, who’s B_1s and $f_z$ maps are shown in right two columns, respectively. As can be seen from the results of agarose phantom, higher B_1s is observed in the center area of the knee coil. However, the bone region in the agarose bone B_1s map shows a much reduced B_1s values due to inefficient excitation of the short T₂ tissue.