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MRSO Terms Sheet Test Study Questions and 100% Correct Verified Answers
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MRSO Terms Sheet Test Study Questions and 100% Correct Verified Answers
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MRSO Terms Sheet Test StudyQuestions and 100% Correct Verified
Answers
Electromagnetic Spectrum - Answer The spectrum of frequencies that identify the
amount and form of energy found at specific frequencies.
Faraday's Law of Induction - Answer This describe how electrical currents are produced
in the presence of alternating magnetic fields.
Far Field - Answer The area in our gantry furthest from the RF transmitter.
First Controlled Mode - Answer This is a mode where the maximum regulated limit
of SAR is allowed during acquisition. This is limited to 4W/kg for the whole body.
Flip Angle - Answer A variable RF pulse that will tilt hydrogen away from the
longitudinal axis less than 90 degrees.
Frequency - Answer The rate that something is repeated over a period of time.
Hertz - Answer The amount of waveforms in a second.
,Larmor Equation - Answer The equation used to identify the center frequency at a specific
static magnetic field strength. Precessional frequency=gyromagnetic ratio * B0
Longitudinal Recovery - Answer The period of time after an excitation pulse
where magnetism returns to equilibrium magnetism.
Loop Burns - Answer This is a type of burning where electrical current is induced in a
patient and forced through a small contact area causing a burn.
Near Field - Answer The area in our gantry which is closest to the RF transmitter.
Non-ionization - Answer A form of energy that does not cause biological damage
to tissues.
Normal Mode - Answer This is a standard mode of operation where SAR for the whole
body is kept to 2 W/kg.
Parallel Imaging - Answer This is a technique where 2 or more coils can be used
in tandem to collect multiple lines of K space at the same time.
Radio waves - Answer The range of frequencies that are used in MRI to produce
resonance.
Receive Only Coil - Answer A receiver coil that only detects signal emitted from
the patient.
Reflective Burns - Answer This is a burning where RF is reflected back to the
patient producing burning.
, Resonance - Answer The transverse of energy from one thing to another by means
of two or more things oscillating at the same frequency.
Resonant Burns - Answer This is a type of burn where resonance is produced in an
implant or in equipment on a patient, which will produce induction. The e-fields
produced will cause burning.
Proximity Burns - Answer This is a type of burning where tissues in the near field
get burned.
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.
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