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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)