ASMIRT – MRI Accreditation Exam | Complete
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Terms in this set (263)
Mild sensory effects due to static • Vertigo
magnetic fields include: • Nausea
• Taste Sensations
,Sensory effects of the static Sensory effects are related to the strength of
magnetic field increase or the magnetic field with few symptoms at 1.5T
decrease with field strength? and more appearing approaching a 4T field
strength
Explain what t-wave artefact is and Any charged particle moving through a
why it occurs magnetic field will have a current induced via
this interaction. As blood, a conductive fluid
flows through a magnetic field it induces an
electrical biopotential. This electrical
biopotential can be seen on the ECG waveform
of patients in MRI. It is demonstrated by an
increase in the T-wave amplitude on ECG. This
change in T-wave amplitude is directly
proportional to the strength of the Static Filed. It
is important that MR radiographers are aware of
this as elevated T-waves are also associated with
ischemia and myocardial infarction.
,What risks does the static magnetic Static Fields also pose hazards through the
field pose in terms of implants and displacement of ferro-magnetic implants and
objects? objects. The static field imparts both a
translation (attractive force) and a torque
(twisting force). The strong nature of the Static
Field also has the potential to disrupt the
function of Cardiac Pacemakers. Anyone
entering beyond the 5G line should be
screened for contraindications to strong
Magnetic Fields. Also be aware of what is being
taken over the 5G line.
, What strategies can be employed • Ferromagnetic objects may become airborne -
to reduce the risks of the static 40 km/hr terminal velocity possible at 1.5T
magnetic field impacting on • Test any metal objects with a hand held magnet
implants and objects? before allowing them to enter the room.
• Keep the general public behind the 5G line. •
Possible contra-indications include pacemakers,
aneurysm clips, intra-vascular coils and stents,
heart valves, penile implants, cochlear implants,
ocular implants (Fatio eyelid springs), neuro
stimulators, bone growth stimulators, drug
infusion pumps.
Verified Test Bank (Latest 2026 Update) 100%
Verified Questions & Answers | Grade A
Save
Terms in this set (263)
Mild sensory effects due to static • Vertigo
magnetic fields include: • Nausea
• Taste Sensations
,Sensory effects of the static Sensory effects are related to the strength of
magnetic field increase or the magnetic field with few symptoms at 1.5T
decrease with field strength? and more appearing approaching a 4T field
strength
Explain what t-wave artefact is and Any charged particle moving through a
why it occurs magnetic field will have a current induced via
this interaction. As blood, a conductive fluid
flows through a magnetic field it induces an
electrical biopotential. This electrical
biopotential can be seen on the ECG waveform
of patients in MRI. It is demonstrated by an
increase in the T-wave amplitude on ECG. This
change in T-wave amplitude is directly
proportional to the strength of the Static Filed. It
is important that MR radiographers are aware of
this as elevated T-waves are also associated with
ischemia and myocardial infarction.
,What risks does the static magnetic Static Fields also pose hazards through the
field pose in terms of implants and displacement of ferro-magnetic implants and
objects? objects. The static field imparts both a
translation (attractive force) and a torque
(twisting force). The strong nature of the Static
Field also has the potential to disrupt the
function of Cardiac Pacemakers. Anyone
entering beyond the 5G line should be
screened for contraindications to strong
Magnetic Fields. Also be aware of what is being
taken over the 5G line.
, What strategies can be employed • Ferromagnetic objects may become airborne -
to reduce the risks of the static 40 km/hr terminal velocity possible at 1.5T
magnetic field impacting on • Test any metal objects with a hand held magnet
implants and objects? before allowing them to enter the room.
• Keep the general public behind the 5G line. •
Possible contra-indications include pacemakers,
aneurysm clips, intra-vascular coils and stents,
heart valves, penile implants, cochlear implants,
ocular implants (Fatio eyelid springs), neuro
stimulators, bone growth stimulators, drug
infusion pumps.
