1|Page
ASMIRT- MRI ACCREDITATION EXAM TEST BANK LATEST 2026-2027 ACTUAL
EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
What are the key advantages of 3D TOFs? - ANSWER-• greater
SNR due to the excitation of a thick slab rather than a thin slice.
• This will allow better resolution through thinner slices, larger
matrices and smaller FOV's.
• less intra voxel dephasing will occur due to the reduced voxel
size.
• selecting a slab rather than a thin slice is less demanding on the
gradient system - this will allow shorter TE times which will also
reduce intra voxel dephasing.
Which examinations are 3D TOFs best used for? - ANSWER-3D
TOF MRA is ideally suited to anatomy such as the Circle of Willis
where high detail is required over a limited area.
Mild sensory effects due to static magnetic fields include: -
ANSWER-• Vertigo
• Nausea
• Taste Sensations
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Sensory effects of the static magnetic field increase or decrease
with field strength? - ANSWER-Sensory effects are related to the
strength of the magnetic field with few symptoms at 1.5T and
more appearing approaching a 4T field strength
Explain what t-wave artefact is and why it occurs - ANSWER-Any
charged particle moving through a 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 field pose in terms of implants
and objects? - ANSWER-Static Fields also pose hazards through
the displacement of ferro-magnetic implants and objects. The
static field imparts both a translation (attractive force) and a
torque (twisting force). The strong nature of the Static Field also
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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 to reduce the risks of the static
magnetic field impacting on implants and objects? - ANSWER-•
Ferromagnetic objects may become airborne - 40 km/hr terminal
velocity possible at 1.5T
• Test any metal objects with a hand held magnet 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.
What effect do gradient magnetic fields have on patient safety? -
ANSWER-Faraday's Law dictates that changing magnetic fields
will generate a voltage and a current in a conductor. The
switching of the gradients induces electrical currents in conductive
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tissues. Voltage generation will occur during the rise and fall times
- ie. while the field is changing. The largest voltages will be
generated at the periphery where the gradient amplitudes are
highest. The most common result of these voltages is Peripheral
Nerve Stimulation (PNS). Other side-effects are listed below;
• magnetophosphenes - electromagnetically induced flashes of
light
• seizures
• tissue heating
• peripheral nerve stimulation
• muscle contractions
• cardiac arrhythmias
• some degree of patient heating has been shown to be a result of
Gradient Magnetic effects. However, this has been shown to be
so low as to be negligible
What strategies can be employed to keep gradient effects to a
minimum? - ANSWER-In order to keep these effects to a
minimum the following is recommended.
ASMIRT- MRI ACCREDITATION EXAM TEST BANK LATEST 2026-2027 ACTUAL
EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
What are the key advantages of 3D TOFs? - ANSWER-• greater
SNR due to the excitation of a thick slab rather than a thin slice.
• This will allow better resolution through thinner slices, larger
matrices and smaller FOV's.
• less intra voxel dephasing will occur due to the reduced voxel
size.
• selecting a slab rather than a thin slice is less demanding on the
gradient system - this will allow shorter TE times which will also
reduce intra voxel dephasing.
Which examinations are 3D TOFs best used for? - ANSWER-3D
TOF MRA is ideally suited to anatomy such as the Circle of Willis
where high detail is required over a limited area.
Mild sensory effects due to static magnetic fields include: -
ANSWER-• Vertigo
• Nausea
• Taste Sensations
,2|Page
Sensory effects of the static magnetic field increase or decrease
with field strength? - ANSWER-Sensory effects are related to the
strength of the magnetic field with few symptoms at 1.5T and
more appearing approaching a 4T field strength
Explain what t-wave artefact is and why it occurs - ANSWER-Any
charged particle moving through a 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 field pose in terms of implants
and objects? - ANSWER-Static Fields also pose hazards through
the displacement of ferro-magnetic implants and objects. The
static field imparts both a translation (attractive force) and a
torque (twisting force). The strong nature of the Static Field also
,3|Page
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 to reduce the risks of the static
magnetic field impacting on implants and objects? - ANSWER-•
Ferromagnetic objects may become airborne - 40 km/hr terminal
velocity possible at 1.5T
• Test any metal objects with a hand held magnet 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.
What effect do gradient magnetic fields have on patient safety? -
ANSWER-Faraday's Law dictates that changing magnetic fields
will generate a voltage and a current in a conductor. The
switching of the gradients induces electrical currents in conductive
, 4|Page
tissues. Voltage generation will occur during the rise and fall times
- ie. while the field is changing. The largest voltages will be
generated at the periphery where the gradient amplitudes are
highest. The most common result of these voltages is Peripheral
Nerve Stimulation (PNS). Other side-effects are listed below;
• magnetophosphenes - electromagnetically induced flashes of
light
• seizures
• tissue heating
• peripheral nerve stimulation
• muscle contractions
• cardiac arrhythmias
• some degree of patient heating has been shown to be a result of
Gradient Magnetic effects. However, this has been shown to be
so low as to be negligible
What strategies can be employed to keep gradient effects to a
minimum? - ANSWER-In order to keep these effects to a
minimum the following is recommended.
