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Radiofrequency waves do what to people
heat/energy but don’t want to burn
SAR
how much the patient RF exposure
What is the FDA limit currently for a whole-body tissue heating
4 w/kg (15 min)
What is the FDA limit currently for a head or torso
8 w/kg (5 mins)
What is the FDA limit currently for extremities
12 w/kg (5 mins)
FDA limit for temp is an increase of what
1 C or 1.8 F
Highest safety issue in MRI
Burns
Focal heating
a certain point something specific is touching and could develop a burn where they touched
Near Field affects
RF burns touching the equipment- touching something that is a conductor
Conductive loop
patient touching themselves and developing burns
Peripheral Nerve Stimulation
FDA limit: What the patient can tolerate
Knocking you hear when MRI machine is on?
Moving magnet/ gradient switching back and forth
What is during scaning
RF and Gradient