TABLE I.

Comparison for the Number of Pixels in the ROI between 9.4 and 7 T Systems Through the Human Head Model.

	ROI is at the center		ROI is off center
The value of $\mid {\mathrm{B}}_1^{+}\mid$	9.4T	7T	9.4T	7T
$\mid {\mathrm{B}}_1^{+}\mid <0.95$	63	112	68	130
$\mid {\mathrm{B}}_1^{+}\mid >0.90$	141	274	146	270
$\mid {\mathrm{B}}_1^{+}\mid >0.85$	223	458	242	432
$\mid {\mathrm{B}}_1^{+}\mid >0.80$	323	634	339	606
$\mid {\mathrm{B}}_1^{+}\mid >0.75$	425	831	452	797
$\mid {\mathrm{B}}_1^{+}\mid >0.70$	530	1047	572	1022
$\mid {\mathrm{B}}_1^{+}\mid >0.65$	658	1298	720	1590

The Total Number of Pixels in the Human Head Mask is 6710. The Calculations Were Performed Using the FDTD Model Where the Maximum Value of $\mid B_1^{+}\mid$ in the Slice is set to 1 at the Center of the ROI.