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MRSO Test with Questions & 100% Correct Answers
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MRSO Test with Questions & 100% Correct Answers
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MRSO Test with Questions & 100%Correct Answers
physical effects of TIME-VARYING FIELDS - Answer motion
noise
induced currents (on object/in person)
lenz
translation
rotation
everything NOT MR SAFE needs to be behind... - Answer 5 gauss line
earth's magnetic fiels - Answer 0.5 gauss
1.5T = ___ gauss - Answer 15,000
3 T = ___ gauss - Answer 30,000
MR device can be considered non-significant risk IF: (list) - Answer static mag field
SAR
dB/dt
sound pressure level
^ are below certain threshold
, dB/dt - Answer gradient fields rate of change can
produce severe discomfort/nerve stimulation
limits for# Tesla adults can take - Answer 8T
limits for # Tesla a >1month old can take - Answer 4T
max unprotected sound level - Answer 140 dB
max PROTECTED sound level - Answer 99 dBA
biological effects of strong mag fields - Answer vertigo
dizziness
nausea
magnetohydrodynamic effects
induced electric currents... (for time-varying....)
magnetophosphenes
nerve stimulation/tingling
hair static (electric charges on skin)
are there known fetal effects of strong magnetic fields? - Answer nope
magnetohydrodynamic effect - Answer bloodflow changes because blood is
flowing inside a strong magnetic field; b/c of ions veering left or right
occupational threshold for sound pressure level - Answer for 8hr shift: 90dB
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