Fig. 1.

Demonstration of ³¹P CSI improvements by using the uHDC technique based on phantom tests. The left panel exhibits experimental setup of the uHDC blocks placed around the phantom (A), and without blocks but keep the phantom at the same position inside the TEM RF volume coil (B). Middle column displays the 2D CSI slices (in the axial plane) selected from 3D CSI dataset with the uHDC blocks using a RF pulse reference voltage of 80 V (C), and without the uHDC blocks using a reference voltage of 160 V (D). (E) Estimation of B₁ improvements in the highlighted voxels (in C and D) using a sinusoidal curve fitting algorithm. It shows that ${\mathrm{B}}_1^{-}$ increased 140% and ${\mathrm{B}}_1^{+}$ increased 130% for the representative voxel.