Table 2.

Numerically computed peak 10g SAR per unit total coil power with phase-only prostate peak B₁⁺ efficiency shim solution inside Duke of the 16LD, 16ML and 10DA are listed along with time average power (TAP) limits for RF safety. Transmit performance of the 16LD is investigated using dipole-loop combined excitation with loop excitation power equal to or less than the dipole excitation power level, as well as dipole-only and loop-only 8 channel excitation schemes. B₁⁺ transmit and SAR efficiencies, and peak B₁⁺ inside the prostate of Duke using the hardware settings at the study site are shown for 16LD, 16ML and 10DA. Simulated SNR of the arrays inside the prostate are listed along the last column.

Coil	Excitation scheme	$\frac{{\text{SAR}}_{10\mathrm{g}}}{{\mathrm{P}}_{\text{coil}}}$	TAP limit [W]			B1+ transmit efficiency	B1+ SAR efficiency	Peak B1+	SNR
			total	per channel
		[W/kg]		Dipole	Loop	$[\frac{\mathrm{\mu }\mathrm{T}}{\sqrt{\mathrm{W}}}]$	$[\frac{\mathrm{\mu }\mathrm{T}}{\sqrt{\mathrm{W}/\text{kg}}}]$	[μT]	[a.u]
16LD	Dipole + Loop	0.269	74.4	4.65	4.65	0.258	0.497	23.3	3.017
	Dipole + Loop(-1dB)	0.266	75.1	5.23	4.16	0.259	0.502	22.2
	Dipole + Loop(-2dB)	0.263	76.2	5.84	3.68	0.260	0.506	21.2
	Dipole + Loop(-3dB)	0.258	77.5	6.45	3.24	0.259	0.510	20.3
	Dipole + Loop(-4dB)	0.253	79.1	7.07	2.81	0.258	0.513	19.5
	Dipole + Loop(-5dB)	0.247	80.9	7.68	2.43	0.256	0.515	18.8
	Dipole + Loop(-6dB)	0.241	82.9	8.28	2.08	0.254	0.517	18.2
	Dipole + Loop(-7dB)	0.236	84.9	8.85	1.77	0.251	0.518	17.6
	Dipole + Loop(-8dB)	0.230	87.1	9.40	1.49	0.249	0.519	17.1
	Dipole + Loop(-9dB)	0.224	89.3	9.91	1.25	0.246	0.519	16.7
	Dipole + Loop(-10dB)	0.219	91.4	10.39	1.04	0.243	0.519	16.3
	Dipole-only (8 ch)	0.222	90.1	11.27	0.00	0.204	0.433	13.0
	Loop-only (8 ch)	0.356	56.3	0.00	7.03	0.165	0.277	10.6
16ML		0.250	80.1	5.01		0.225	0.451	20.4	2.522
10DA		0.265	75.5	7.55		0.217	0.421	15.5	2.394