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MRSO SAFETY EXAM
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MRSO SAFETY EXAM 2024-2025Slew rate - Answer The speed with which the gradient coil turns on and off
Time-varying Gradient - Answer: Induced current in a patient
ANSWER: Magnetic flux lines travel from the north to the south pole.
ANSWER: Permanent Magnet Cannot be turned off.
Very affordable; and incredibly heavy.
Around 0.4T.
Vertical vector.
ANSWER: A resistive magnet Can switch on and off.
Costly because of cooling.
Around 0.6T.
Vertical or horizontal vector?
Superconductive magnet - Approximately 10T.
Low electricity; fair cost.
Active shielding - ANSWER To diminish the fringe field, a wire coil with an
electrical current running through it is used to generate an electromagnetic field
that opposes the static magnetic field.
, B-sub zero - ANSWER The unit used to describe static magnetic fields
Deflection - Answer The degree of attraction an object has to the static magnetic
field.
Diamagnetism - Answer A weakly repelling force when put in a strong static
magnetic field.
Faraday's Law of Induction: ANSWER This outlines how electrical currents are
generated in the presence of an alternating magnetic field.
Ferromagnetism - Answer An item with significant attraction force, in a strong
static magnetic field, that retains a magnetic field even after leaving the strong
static magnetic field.
Fringe field - Answer The magnetic field that extends beyond of the MRI unit
Gauss - Answer A magnetic field unit of measurement.
Lenz's Force - ANSWER When nonferrous items move through a strong static
magnetic field, they produce a magnetic field.
Magnetic moment - ANSWER Each hydrogen proton produces its magnetic field.
Magnetohydrodynamic Effect - Answer When a patient is subjected to a powerful
static magnetic field, their blood gets magnetized. This results in an increased T
wave in the cardiac cycle.
Paramagnetic - Answer A weakly attracting force when placed in a static magnetic
field.
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