In-room imaging and MR planning

RF Heating

• RF power deposition expressed as Specific Absorption Rate or SAR (in W/Kg) • Up to 3.0 T, SAR  B 2 • heat stress (Testis, Foetus etc), implants/devices • At higher field the body is more conductive and leads to weaker penetration • SAR depends on RF pulses per unit time, patient weight, flip angle, RF wave form, field strength, transmit coil design (quadrature or linear) • Scanner calculates SAR and also performs real time monitoring (time average and peak)