Finite volume analysis of temperature effects induced by active MRI implants with cylindrical symmetry: 1. Properly working devices

Table 1 Physical constants of tissue, titanium, iron and tantalum

material	density ρ	specific heat c	thermal conduct. λ	electric conduct. σ
	[kg/m³]	[J/(kg K]	[W/(m·K)]	[S/m]
tissue	1000 [22]	3650 [23]	0.5 [24]	0.8–8.0 [22]
saline	1003	4185		1.45*
titanium	4510	523	21.9	2.56 10⁶
iron	7870	449	80.2	10.4 10⁶
tantalum	16680	140	57.5	7.63 10⁶

* The electric conductivity of physiologic saline for the calculation of the SAR was determined to be 1.45 S/m at 22°C (295 K) and a frequency of 63.5 MHz. (Personal communication with Mr. Alexander Walkov at "Physikalisch-Technische Bundesanstalt" in Berlin, Germany)

ISSN: 1475-925X