Active Shielding - answer✔✔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 - answer✔✔The unit used to describe the static magnetic field.
Deflection - answer✔✔The amount of attraction an object has to the static magnetic field.
Diamagnetism - answer✔✔A weakly repulsive force when placed in a strong static magnetic
field.
Faradays Law of Induction - answer✔✔This describes how electrical currents are produced in
the presence of alternating magnetic fields.
Ferromagnetism - answer✔✔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 - answer✔✔The gradient of magnetic densities that move from the north pole of the
static magnetic field to the south pole.
Fringe Field - answer✔✔The magnetic field that extends outside the MR unit.
Gauss - answer✔✔A magnetic field unit of measurement.
Horizontal Static Magnetic Field - answer✔✔A magnetic field vector that is horizontal.
Lenz's Force - answer✔✔The process of non-ferrous objects producing a magnetic field when
moved through a strong static magnetic field.
Magnetic Field Strength - answer✔✔The overall magnetic field strength of the MR unit.
Magnetic Moment - answer✔✔An individual magnetic field produced by each hydrogen proton.
Magnohydrodynamic Effect - answer✔✔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 - answer✔✔A weakly attractive force when placed in a static magnetic field.
Passive Shielding - answer✔✔The use of magnetically conductive materials in an MR unit to
reduce the fringe field.
Pauli Exclusion Principle - answer✔✔The principle that describes the atom structure and the
types of magnetism (ferromagnetism, paramagnetic, diamagnetism...).
Rotational Force - answer✔✔A force which aligns objects affected by the static magnetic field to
its flux lines.
Spatial Gradient Magnetic - answer✔✔The changing magnetic field strength demonstrated at
different distances from the MR unit.
Static Magnetic Field - answer✔✔The magnetic field that aligns hydrogen nuclei parallel or anti-
parallel.
Superparamagnetic - answer✔✔A stronger attractive force than superparamagnetic, but not as
strong as ferromagnetism when placed in a strong static magnetic field.
Teratogenic - answer✔✔The potential effects of a static magnetic field on the offspring of
individuals exposed to it.
Tesla - answer✔✔The unit of measurement used to describe the static magnetic field.
Translation Force - answer✔✔The attractive for of an object as it translates through the static
gradient magnetic field.
Vector - answer✔✔The direction of the static magnetic field.
Vertical Static Magnetic Field - answer✔✔A magnetic field vector that is vertical.
Axial Imaging - answer✔✔This is a set of imaging produced when the Z gradient is activated.
Coronal Imaging - answer✔✔This is a set of imaging produced when the Y gradient is activated.
Duty Cycle - answer✔✔The amount of time that the gradient coils can remain active.
Golay Coil - answer✔✔A pair of saddle electromagnetic coils located on the right and left, and
anterior and posterior of the patient, which produce strong magnetic fields from left to right, and
anterior to posterior.
Gradient Steepness - answer✔✔The slope or amplitude of the gradient activated.
Logical Gradient - answer✔✔Term used to describe the gradient activation in data acquisition.
This can be described as the slice selection gradient, phase encoding gradient, and frequency
encoding gradient.
Lorenz Force - answer✔✔The torque caused on the MR gantry as the gradient coils are
activated. This produces the noises heard in MRI.
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