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MRSO EDUCATIONAL MODULES EXAM
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MRSO EDUCATIONAL MODULES EXAM2024-2025
ANSWER: Static Magnetic Field poses hazards to our patients by involving
materials with unique qualities.
Magnetic Properties - ANSWER -When placed in a strong magnetic field,
molecules exhibit characteristics that are dependent on their quantum state and
temperature.
ANSWER: Diagmagnetism exhibits a weak repulsive force in the presence of a
strong static magnetic field.
ANSWER: Paramagnetism exhibits a mild attractive force in the presence of a
strong static magnetic field.
ANSWER: Ferromagnetism exhibits a significant attractive force in the presence of
a static magnetic field.
-this attracting force is retained in the ferromagnetic object for a length of time
even after leaving the static field.
Basic Units of Measurement - ANSWER: static magnetic field
-Magnetic flux
-Millitesla (mT)
-Gauss (G).
– Tesla (T)
ANSWER: This relates to the direction and strength of a static magnetic field.
,-represents as B0 (B Zero)
ANSWER: Magnetic flux is the magnetic force that surrounds a magnetic source
Millitesla: ANSWER -mT
Gauss (G) - Answer: -1 mT
-5 G = 0.5 mT
Tesla (T) - Answer -10,000 Gauss = 1 T.
Lines of Flux - ANSWER: invisible lines.
-fringe field.
-vector directions.
-Short bore vs. Long bore
Invisible Lines - ANSWER - force that flows from a magnet's north pole to the
south pole
Fringe Field - A field that extends outside the MR unit.
-varies in strength as you approach closer to the MR unit.
Vector Directions - Answer: vertical or horizontal
Short bore vs long bore - ANSWER: Short bores have strong spatial gradients.
, Magnetic Spatial Gradient - ANSWER -Fringe field spreading outside the MR unit
-used to describe the change in strength of the magnetic field as we approach the
MR unit.
-Magnetic fields have layers, just like onions.
- Measured in dB/dx.
In other terms, T/m or G/cm.
-1 T/m equals 100 G/cm
Isogauss Plot - ANSWER - provides the exact field strength at a given place in the
MR unit.
-plot must show specific strengths.
-0.5 mT (5 gauss) to 200 mT (2 000 gauss)
-must be located in Zone IV.
-field strengths > 5 G describe the MR environment.
-shows how well a room is shielded.
The steeper distribution of magnetic field at the MR unit suggests shielding.
Risks Associated with Static Magnetic Field - ANSWER: translational force
(missile effect).
-shielding
-maximum spatial gradient and force product
Translational force (missile effect) - ANSWER: magnetic spatial gradient
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