Table 2.

Summary of transmit B₁ (B₁⁺) statistics over the prostate, peak one gram averaged SAR normalized to 1 W per channel (SAR_{peak_norm}) and calculated time averaged power limits (TAP_limit).

		B1+				SAR c	TAP d
		Mean ± SD μT/W05	Inhomo. b %	Min. μT/W05	Max. μT/W05	Peak_Norm W/kg	Limit W
trESA	In vivo a	0.152 ± 0.016	10	0.081	0.180	--	2.54
	Simulation	0.148 ± 0.023	15	0.084	0.177	6.29	--
trERC	In vivo a,e	1.24 ± 0.421	34	0.345	2.04	--	1.34
	Simulation	1.48 ± 0.972	66	0.305	7.35	6.64	--

^aIn vivo results are from the reference volunteer.

^bInhomogenetity is determined as the ratio of the standard deviation to mean.

^cPeak one gram averaged SAR normalized to 1 W per channel. Therefore, these values are a result of 16 W total for the trESA and 1W total for the trERC.

^dTime averaged power limits in Watts per channel.

^eWhile the in vivo and simulated results are relatively consistent as shown by the profiles in Fig. 3 and 4, the DAM measurements do not faithfully measure the high B1+ close to the trERC coil. Therefore the simulated standard deviations and maximum B1+ values are more representative of expected in vivo values.