MRSO EXAM WITH VERIFIED QUESTIONS
AND ANSWERS
What needs to be documented in the pregnant patient's chart? (3) - ANSWER-1.
The information requested from the MR study cannot be acquired by non-
ionizing means (ultrasonography)
2. The date is needed to potentially affect the care of either the patient or the
fetus during the pregnancy
3. The referring physician feels it is not prudent to wait until the patient is no
longer pregnant to obtain this data.
ACR states informed consent in pregnant patients is / is not required -
ANSWER-is not required.
Gadolinium use with pregnant patients - ANSWER-Should not be routinely
used in pregnant patients
The decision to use gadolinium contrast in a pregnant patient must be made by -
ANSWER-Case-by-case decision made by level 2 MR
personnel-designated attending radiologist who will assess the risk-benefit ratio
for the particular patient and accompanied by a well-documented and thoughtful
risk-benefit analysis
Pregnant MRI staff - ANSWER-Permitted to work in and around the MR
environment throughout all stages of their pregnancy. May perform all job-
related duties
Requested not to remain with the scanner bore or Zone IV during active
scanning
,The use of ferromagnetic detection systems is
recommended as an adjunct to - ANSWER-thorough and conscientious
screening of persons and devices approaching Zone IV
Which pulse sequences cause greatest tissue heating? - ANSWER-Turbo Spin
Echo / Fast Spin Echo
Which pulse sequences cause greatest Peripheral Nerve Stimulation? -
ANSWER-EPI (Echo Planar Imaging), DTI (Diffusion Tensor Imaging)
Slew Rate= - ANSWER-Max Amplitude / Rise Time
Slew Rate is expressed in - ANSWER-T/m/sec (Tesla per metre per second)
Higher slew rates cause which biological effects? - ANSWER-Peripheral Nerve
Stimulation & Acoustic Noise
Gradient Fields are also known as - ANSWER-Time Varying Magnetic Fields
Big Gradients allow smaller.. - ANSWER-FOV, Shorter echo times, thinner
slices
How does field strength affect gradient fields? - ANSWER-Don't. - Independent
What is responsible for the noise in MRI? - ANSWER-Lorentz Forces in
gradients
Which has higher frequency? Gradient switching or RF? - ANSWER-RF
(Measured in MegaHertz)
, Parameters that affect Slew Rate - ANSWER-FOV
Rect FOV / Parallel Imaging
Slice Thickness
Echo Spacing / Receiver Bandwidth
Vendor Options for Acoustic Noise
Reduction
PNS - ANSWER-Greatest further from isocenter
Varies with patients
Normal Operating Mode: 80% of the
peripheral nerve stimulation mean
1st Level Controlled: 100% of the
peripheral nerve stimulation mean
FDA Limit: No Painful Stimulation
Nerve Stimulation threshold is smallest for what type of tissues? - ANSWER-
Peripheral nerves
Nerve stimulation threshold is greatest for what type of tissue? - ANSWER-
Cardiac
Hearing protection must be provided for - ANSWER-everyone in the scan room
during a scan
The FDA decible (db) limit for MRI is - ANSWER-99 db
The use of metal detectors in MRI is - ANSWER-discouraged
AND ANSWERS
What needs to be documented in the pregnant patient's chart? (3) - ANSWER-1.
The information requested from the MR study cannot be acquired by non-
ionizing means (ultrasonography)
2. The date is needed to potentially affect the care of either the patient or the
fetus during the pregnancy
3. The referring physician feels it is not prudent to wait until the patient is no
longer pregnant to obtain this data.
ACR states informed consent in pregnant patients is / is not required -
ANSWER-is not required.
Gadolinium use with pregnant patients - ANSWER-Should not be routinely
used in pregnant patients
The decision to use gadolinium contrast in a pregnant patient must be made by -
ANSWER-Case-by-case decision made by level 2 MR
personnel-designated attending radiologist who will assess the risk-benefit ratio
for the particular patient and accompanied by a well-documented and thoughtful
risk-benefit analysis
Pregnant MRI staff - ANSWER-Permitted to work in and around the MR
environment throughout all stages of their pregnancy. May perform all job-
related duties
Requested not to remain with the scanner bore or Zone IV during active
scanning
,The use of ferromagnetic detection systems is
recommended as an adjunct to - ANSWER-thorough and conscientious
screening of persons and devices approaching Zone IV
Which pulse sequences cause greatest tissue heating? - ANSWER-Turbo Spin
Echo / Fast Spin Echo
Which pulse sequences cause greatest Peripheral Nerve Stimulation? -
ANSWER-EPI (Echo Planar Imaging), DTI (Diffusion Tensor Imaging)
Slew Rate= - ANSWER-Max Amplitude / Rise Time
Slew Rate is expressed in - ANSWER-T/m/sec (Tesla per metre per second)
Higher slew rates cause which biological effects? - ANSWER-Peripheral Nerve
Stimulation & Acoustic Noise
Gradient Fields are also known as - ANSWER-Time Varying Magnetic Fields
Big Gradients allow smaller.. - ANSWER-FOV, Shorter echo times, thinner
slices
How does field strength affect gradient fields? - ANSWER-Don't. - Independent
What is responsible for the noise in MRI? - ANSWER-Lorentz Forces in
gradients
Which has higher frequency? Gradient switching or RF? - ANSWER-RF
(Measured in MegaHertz)
, Parameters that affect Slew Rate - ANSWER-FOV
Rect FOV / Parallel Imaging
Slice Thickness
Echo Spacing / Receiver Bandwidth
Vendor Options for Acoustic Noise
Reduction
PNS - ANSWER-Greatest further from isocenter
Varies with patients
Normal Operating Mode: 80% of the
peripheral nerve stimulation mean
1st Level Controlled: 100% of the
peripheral nerve stimulation mean
FDA Limit: No Painful Stimulation
Nerve Stimulation threshold is smallest for what type of tissues? - ANSWER-
Peripheral nerves
Nerve stimulation threshold is greatest for what type of tissue? - ANSWER-
Cardiac
Hearing protection must be provided for - ANSWER-everyone in the scan room
during a scan
The FDA decible (db) limit for MRI is - ANSWER-99 db
The use of metal detectors in MRI is - ANSWER-discouraged
