Table 2. Summary of simulation results for the head coil tuned down to 127 MHz (3 T).

		Neonate A		Neonate B		Duke
Dielectric properties		Adult	Neonatal	Adult	Neonatal	Adult
Mean B1+ for 1 W input (μT/✓W)		0.85	0.83	0.86	0.86	0.71
Absorbed power (%)		17	25	12	18	66
SAR per input power (W/kg/W)	Head average	0.12	0.17	0.09	0.13	0.13
	Whole-body average	0.04	0.06	0.03	0.05	0.01
	psSAR10g	0.33	0.48	0.28	0.47	0.41
SAR per mean	Head average	0.17	0.24	0.12	0.18	0.26
B1 + (W/kg/μT2)	Whole-body average	0.06	0.09	0.04	0.06	0.02
	psSAR10g	0.45	0.69	0.39	0.63	0.81

Note: The device was only retuned (and the RF shield removed), but otherwise not optimized. It is clear that the coil is not well matched, so instead we focused on the SAR normalized to B₁⁺ in further analysis. The resulting B₁⁺ and SAR distributions are shown in Supporting Information Figure S1. The psSAR_10g per square B₁⁺ is smaller for the neonate models if the same dielectric properties are used, but becomes comparable to the adult if age-adjusted properties are used.