Thermal magnetic resonance: physics considerations and electromagnetic field simulations up to 23.5 Tesla (1GHz)

Radiation Oncology

Table 1 Electromagnetic and thermal properties of brain tissue

Tissue	Permittivity			Electrical conductivity [S/m]			Density [kg/m³]	Heat capacity [J/kg/°C]	Thermal conductivity [W/m/°C]	Heat transfer rate [ml/min/kg]	Heat generation rate [W/kg]
	300 MHz	500 MHz	1 GHz	300 MHz	500 MHz	1 GHz
White matter	43.8	41	38.6	0.41	0.47	0.62	1041	3583	0.48	212	4.32
Grey matter	60	55.8	52.3	0.69	0.78	0.99	1045	3696	0.55	764	15.54
Blood	65.7	63.3	61.1	1.32	1.38	1.58	1060	3900	0.52	10000	0

Electromagnetic and thermal properties for 300 MHz, 500 MHz and 1 GHz of brain grey matter, brain white matter and blood used in the electromagnetic simulations with the human voxel model “Ella” [28]. All other material parameters used in the electromagnetic field simulations (e.g., skin or fat) can be found in [29]

ISSN: 1748-717X