MRSO: Educational Modules Exam Study
Guide
Static Magnetic Field - answer-poses risks to our patient that involve materials with specific
properties
Magnetic Properties - answer-when place in a strong magnetic field, molecules demonstrate
behaviors that depends on their quantum state and tempe...
Static Magnetic Field - answer✔✔-poses risks to our patient that involve materials with specific
properties
Magnetic Properties - answer✔✔-when place in a strong magnetic field, molecules demonstrate
behaviors that depends on their quantum state and temperature
Diagmagnetism - answer✔✔-demonstrates a weak repulsive force in the presence of a strong
static magnetic field
Paramagnetism - answer✔✔-demonstrates a weak attractive force in the presence of a strong
static magnetic field
Ferromagnetism - answer✔✔-demonstrates a strong attractive force in the presences of a static
magnetic field
-this attractive force is retained in the ferromagnetic object after a period of time even after
leaving the static field
Basic Units of Measurement - answer✔✔-static magnetic field
-magnetic flux
-millitesla (mT)
-Gauss (G)
-Tesla (T)
Static Magnetic Field - answer✔✔-this refers to the direction and strength of a static magnetic
field
-represents as B0 (B zero)
Magnetic Flux - answer✔✔-the magnetic force that encompasses a magnetic source
Lines of Flux - answer✔✔-invisible lines
-fringe field
-vector directions
-short bore vs long bore
Invisible Lines - answer✔✔-force that travels from the north pole of a magnet to the south pole
Fringe Field - answer✔✔-field that extends outside the MR unit
-varies strength the closer you get to the MR unit
Vector Directions - answer✔✔-vertical or horizontal
Short Bore vs Long Bore - answer✔✔-short bore have steep spatial gradients
Magnetic Spatial Gradient - answer✔✔-fringe field extending outside MR unit
-used to describe the change in strength of the magnetic field as we get closer to the MR unit
-like an onion has layers, so does a magnetic field
-measured in dB/dx
-in other words, T/m or G/cm
-1 T/m = 100 G/cm
Isogauss Plot - answer✔✔-gives exact field strength at a give location in the MR unit
-plot must demonstrate specific strengths
-0.5 mT (5 gauss) to 200 mT (2000 gauss)
-needs to be found in Zone IV
-field strengths > 5 G define MR environment
-demonstrates how well a room is shielded
steeper spread of magnetic field at the MR unit indicates shielding
Risks Associated w/ Static Magnetic Field - answer✔✔-translational force (missile effect)
-shielding
-maximum spatial gradient/force product
Translational Force (Missile Effect) - answer✔✔-magnetic spatial gradient
-an object will experience different magnetic fields and therefore be attracted to the MR unit
-if it doesn't experience multiple fields at once, it will not translate through the magnetic field
-object will not demonstrate any attraction at isocenter
Shielding - answer✔✔-Active Shielding vs Passive Shielding
-active shielding uses a coil of wire with a current running opposite direction to the static
magnetic field
-passive shielding use magnetically conductive material to shape the state magnetic field
Maximum Spatial Gradient/Force Product - answer✔✔-total magnetic force of an MR unit
-dB/dx+-B
-T2/m or G2/cm
Deflection - answer✔✔-the amount of degrees that an implant is attracted to the MR unit
-translational force vs gravity
Rotational Force - answer✔✔-when a ferrous object aligns itself to the magnetic flux lines of the
static magnetic field
-can cause torquing of ferrous implants within a patient
-can cause ferrous objects off the side of a MR unit to be attracted towards isocenter
-isocenter will demonstrate the largest amount of rotational force
Len'z Forces - answer✔✔-electrically conductive material can demonstrate opposing magnetic
fields when moving/translating through a static magnetic field
-an exam should never be cancelled because of the change of Len'z force being placed on an
implant
-the amount of opposing force is proportional to the amount of current generated in the
conductive material
-moving the patient slower through the spatial magnetic gradient, less opposing force will be
induced in the electrically conductive material
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