ANIMATION I6.1

MRI Safety Guidelines (1982)

Static Magnetic Field ( B_o )
Maximum clinical imager magnetic field	2.0 T
Maximum inadvertant exposure	0.0005 T

Rate of Change of Magnetic Field (dB/dt)
System < 6 T/s
Axial Gradients > 120 s < 20 T/s
12 s < < 10 s < 2400/(s) T/s
< 12 s < 200 T/s
Transverse Gradients < 3x above
= risetime of gradient

Rate of Change of Magnetic Field (dB/dt)
System		< 6 T/s
Axial Gradients	> 120 s	< 20 T/s
	12 s < < 10 s	< 2400/(s) T/s
	< 12 s	< 200 T/s
Transverse Gradients		< 3x above

RF Power Deposition
Temperature (37^o C normal) Change < 1 ^o C local
Maximum Head < 38 ^o C
Maximum Trunk < 39 ^o C
Maximum Extremities < 40 ^o C
Specific Absorption Rate (SAR) Whole Body < 0.4 W/kg
Any 1 gram of tissue < 8.0 W/kg
Head (averaged) < 3.2 W/kg

RF Power Deposition
Temperature (37^o C normal)	Change	< 1 ^o C local
	Maximum Head	< 38 ^o C
	Maximum Trunk	< 39 ^o C
	Maximum Extremities	< 40 ^o C
Specific Absorption Rate (SAR)	Whole Body	< 0.4 W/kg
	Any 1 gram of tissue	< 8.0 W/kg
	Head (averaged)	< 3.2 W/kg

Acoustic Noise Level
L_Peak 200 Pascals
L_eq. averaged over 1 Hr 105 dBA