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

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

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
  1. * 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)