MRSO CORE EXAMS MANUAL QUESTIONS AND
ANSWERS SURE A+
✔✔These agencies regulates Time-Varying Gradient Field Occupational Exposure -
✔✔ICNIRP & IEC
✔✔These agencies regulates Time-Varying Gradient Field Patient Exposure -
✔✔IEC/FDA
✔✔This agency regulates MRI sound pressure levels - ✔✔FDA
✔✔MRI Sound Pressure Levels limited to - ✔✔99dBA with Hearing protection
✔✔These agencies regulates Time-Varying RF Field Patient Exposure - ✔✔FDA & IEC
✔✔These agencies regulates Time-Varying RF Field Occupational Exposure - ✔✔IEC
& ICNIRP
✔✔Active Shielding - ✔✔The use of a coil of wire, with an electrical current running
through it to produce an electromagnetic field opposing the static magnetic field, to
reduce the fringe field.
,✔✔Bsub0 - ✔✔The unit used to describe the static magnetic field.
✔✔Deflection - ✔✔The amount of attraction an object has to the static magnetic field.
✔✔Diamagnetism - ✔✔A weekly repulsive force when placed in a strong static
magnetic field.
✔✔Faraday's Law of Induction - ✔✔This describes how electrical currents are produced
in the presence of alternating magnetic fields.
✔✔Ferromagnetism - ✔✔An object with strong attractive force, in a strong static
magnetic field, that retains a magnetic field even when leaving the strong static
magnetic field.
✔✔Flux Lines - ✔✔The gradient of magnetic densities that move from north pole of the
static magnetic field to the south pole.
✔✔Fringe Field - ✔✔The magnetic field that extends outside the MR unit.
✔✔Gauss - ✔✔A magnetic field unit of measurement.
10,000 Gauss = 1 Tesla
✔✔Horizontal Static Magnetic Field - ✔✔A magnetic field vector that is Horizontal.
Seen in Superconducting Magnets
✔✔Lenz's Force - ✔✔The process of non-ferrous objects producing a magnetic field
when moved through a strong static magnetic field.
✔✔Magnetic Field Strength - ✔✔The overall magnetic field strength of the MR unit.
✔✔Magnetic Moment - ✔✔An individual magnetic field produced by each hydrogen
proton.
✔✔Magnohydrodynamic Effect - ✔✔When a patient is exposed to a strong static
magnetic field, their blood becomes magnetized. This causes an elevated T wave in
their cardiac cycle.
✔✔Paramagnetic - ✔✔A weekly attractive force when placed in a static magnetic field.
✔✔Passive Shielding - ✔✔The use of magnetically conductive material in an MR unit to
reduce the fringe field.
, ✔✔Pauli Exclusion Principle - ✔✔The principle that describes the atom structure and
the types of magnetism.
Ferromagnetism, Superparamagnetic, Paramagnetic, Diamagnetism
✔✔Rotational Force - ✔✔A force which aligns objects affected by the static magnetic
field to its flux lines.
Torque
✔✔Spatial Gradient Magnetic - ✔✔The changing magnetic field strength demonstrated
at different distances from the MR unit.
✔✔Superparamagnetic - ✔✔A stronger attractive force than paramagnetic, but not as
strong as ferromagnetism when placed in a strong static magnetic field.
✔✔Teratogentic - ✔✔The potential effects of a static magnetic field on offspring of
individuals exposed to it.
✔✔Tesla - ✔✔The unit of measurement used to describe the static magnetic field.
1 Tesla - 10,000 Gauss
✔✔Translation Force - ✔✔The attractive force of an object as it translates through the
static gradient magnetic field.
Missle Effect
✔✔Vector - ✔✔The direction of the static magnetic field.
Superconducting Magnet - Horizontal
Permanent Magnet - Vertical
✔✔Vertical Static Magnetic Field - ✔✔A magnetic field vector that is vertical.
Seen with Permanent Magnets.
✔✔This gradient is responsible for axial imaging. - ✔✔Z Gradient
✔✔This gradient is responsible for sagittal imaging. - ✔✔X Gradient
✔✔This gradient is responsible for coronal imaging. - ✔✔Y Gradient
ANSWERS SURE A+
✔✔These agencies regulates Time-Varying Gradient Field Occupational Exposure -
✔✔ICNIRP & IEC
✔✔These agencies regulates Time-Varying Gradient Field Patient Exposure -
✔✔IEC/FDA
✔✔This agency regulates MRI sound pressure levels - ✔✔FDA
✔✔MRI Sound Pressure Levels limited to - ✔✔99dBA with Hearing protection
✔✔These agencies regulates Time-Varying RF Field Patient Exposure - ✔✔FDA & IEC
✔✔These agencies regulates Time-Varying RF Field Occupational Exposure - ✔✔IEC
& ICNIRP
✔✔Active Shielding - ✔✔The use of a coil of wire, with an electrical current running
through it to produce an electromagnetic field opposing the static magnetic field, to
reduce the fringe field.
,✔✔Bsub0 - ✔✔The unit used to describe the static magnetic field.
✔✔Deflection - ✔✔The amount of attraction an object has to the static magnetic field.
✔✔Diamagnetism - ✔✔A weekly repulsive force when placed in a strong static
magnetic field.
✔✔Faraday's Law of Induction - ✔✔This describes how electrical currents are produced
in the presence of alternating magnetic fields.
✔✔Ferromagnetism - ✔✔An object with strong attractive force, in a strong static
magnetic field, that retains a magnetic field even when leaving the strong static
magnetic field.
✔✔Flux Lines - ✔✔The gradient of magnetic densities that move from north pole of the
static magnetic field to the south pole.
✔✔Fringe Field - ✔✔The magnetic field that extends outside the MR unit.
✔✔Gauss - ✔✔A magnetic field unit of measurement.
10,000 Gauss = 1 Tesla
✔✔Horizontal Static Magnetic Field - ✔✔A magnetic field vector that is Horizontal.
Seen in Superconducting Magnets
✔✔Lenz's Force - ✔✔The process of non-ferrous objects producing a magnetic field
when moved through a strong static magnetic field.
✔✔Magnetic Field Strength - ✔✔The overall magnetic field strength of the MR unit.
✔✔Magnetic Moment - ✔✔An individual magnetic field produced by each hydrogen
proton.
✔✔Magnohydrodynamic Effect - ✔✔When a patient is exposed to a strong static
magnetic field, their blood becomes magnetized. This causes an elevated T wave in
their cardiac cycle.
✔✔Paramagnetic - ✔✔A weekly attractive force when placed in a static magnetic field.
✔✔Passive Shielding - ✔✔The use of magnetically conductive material in an MR unit to
reduce the fringe field.
, ✔✔Pauli Exclusion Principle - ✔✔The principle that describes the atom structure and
the types of magnetism.
Ferromagnetism, Superparamagnetic, Paramagnetic, Diamagnetism
✔✔Rotational Force - ✔✔A force which aligns objects affected by the static magnetic
field to its flux lines.
Torque
✔✔Spatial Gradient Magnetic - ✔✔The changing magnetic field strength demonstrated
at different distances from the MR unit.
✔✔Superparamagnetic - ✔✔A stronger attractive force than paramagnetic, but not as
strong as ferromagnetism when placed in a strong static magnetic field.
✔✔Teratogentic - ✔✔The potential effects of a static magnetic field on offspring of
individuals exposed to it.
✔✔Tesla - ✔✔The unit of measurement used to describe the static magnetic field.
1 Tesla - 10,000 Gauss
✔✔Translation Force - ✔✔The attractive force of an object as it translates through the
static gradient magnetic field.
Missle Effect
✔✔Vector - ✔✔The direction of the static magnetic field.
Superconducting Magnet - Horizontal
Permanent Magnet - Vertical
✔✔Vertical Static Magnetic Field - ✔✔A magnetic field vector that is vertical.
Seen with Permanent Magnets.
✔✔This gradient is responsible for axial imaging. - ✔✔Z Gradient
✔✔This gradient is responsible for sagittal imaging. - ✔✔X Gradient
✔✔This gradient is responsible for coronal imaging. - ✔✔Y Gradient
