.
MRSO Exam Prep with Questions and Answers
ACR Guidelines for orbit screening: - ANSWER-"All patients who have a history of orbit
trauma by
a potential ferromagnetic foreign body for which
they sought medical attention are to have their
orbits cleared by either plain X-ray orbit films
(2 views) or by a radiologist's review and
assessment of contiguous cut prior CT or MR
images (obtained since the suspected traumatic
event) if available."
ACR Guidance on MR Safe Practice
Pg 6
."The results of such (portable metallic/partially metallic object) testing, as well as the date,
time, and name of the tester, and methodology used for that particular device,
should be documented in writing. If a device has not been tested, or if its MR compatibility or
safety status is unknown, it should not be permitted unrestricted access to Zone ____." -
ANSWER-documented in writing / 3
.1 mT = _______________ Gauss - ANSWER-1/1,000 T (or 10 (-3) T) = 10 G
.1 T/m = ______ g/cm - ANSWER-100 g/cm
,.1 Tesla = ______________ Gauss - ANSWER-1 Tesla = 1000 gauss
.100 W-min/kg (6000 J/kg) - ANSWER-SED limit for patients with thermal regulation
compromise - may suffer physiological stress or tissue damage. 25 min continuous scanning
at 4 W/kg (1st Level Controlled)
50 min continuous scanning at 2 W/kg (Normal Mode)
.240 W-min/kg (14440 J/kg)* - ANSWER-Research shows that this level will produce a
temperature rise to 430 C (1090 F) above which
patient with normal thermal regulation may
suffer tissue damage
1 Hr continuous scanning at 4 W/kg (1st Level Controlled)
2 Hr continuous scanning at 2 W/kg (Normal Mode)
.3 types of metals - ANSWER-Austinitic, Martenitic, Ferritic
.5 G = ___ mT - ANSWER-5 G = 0.5 mT
.A fixed difference in a magnetic field across space - ANSWER-Spatial Gradient
.ACR - MRI Safety during pregnancy - ANSWER-Can be accepted at any stage of pregnancy.
Level 2-designated attending radiologist to confer with ordering physician and determine that
the risk-vs-benefit ratio to the patient warrants the study
.ACR states informed consent in pregnant patients is / is not required - ANSWER-is not
required.
, .American Board of Magnetic Resonance Safety ABMRS provides MR Safety Credentialing for:
- ANSWER-MR Medical Director (MRMD)
MR Safety Officers (MRSO)
MR Safety Experts (MRSE)
.An item that poses no known hazards
resulting from exposure to any MR environment - ANSWER-MR Safe
.An item which poses unacceptable risks
to the patient, medical staff or other
persons within the MR environment - ANSWER-MR Unsafe
.An item with demonstrated safety
in the MR environment within defined conditions - ANSWER-MR Conditional
.Any area 5 gauss or higher is zone ________ and must have _________ access - ANSWER-4 -
restricted access
.Any metallic object will never be labeled as - ANSWER-MRI Safe
.B1 is - ANSWER-RF Power
.Big Gradients allow smaller.. - ANSWER-FOV, Shorter echo times, thinner slices
.Biologic effects of Static magnetic field: - ANSWER-Vertigo, Metallic taste,
Magnetophosphenes, Magnetohydromagnetic effect, EKG perturbances, nystagmus
.Bo - ANSWER-Static magnetic field direction
MRSO Exam Prep with Questions and Answers
ACR Guidelines for orbit screening: - ANSWER-"All patients who have a history of orbit
trauma by
a potential ferromagnetic foreign body for which
they sought medical attention are to have their
orbits cleared by either plain X-ray orbit films
(2 views) or by a radiologist's review and
assessment of contiguous cut prior CT or MR
images (obtained since the suspected traumatic
event) if available."
ACR Guidance on MR Safe Practice
Pg 6
."The results of such (portable metallic/partially metallic object) testing, as well as the date,
time, and name of the tester, and methodology used for that particular device,
should be documented in writing. If a device has not been tested, or if its MR compatibility or
safety status is unknown, it should not be permitted unrestricted access to Zone ____." -
ANSWER-documented in writing / 3
.1 mT = _______________ Gauss - ANSWER-1/1,000 T (or 10 (-3) T) = 10 G
.1 T/m = ______ g/cm - ANSWER-100 g/cm
,.1 Tesla = ______________ Gauss - ANSWER-1 Tesla = 1000 gauss
.100 W-min/kg (6000 J/kg) - ANSWER-SED limit for patients with thermal regulation
compromise - may suffer physiological stress or tissue damage. 25 min continuous scanning
at 4 W/kg (1st Level Controlled)
50 min continuous scanning at 2 W/kg (Normal Mode)
.240 W-min/kg (14440 J/kg)* - ANSWER-Research shows that this level will produce a
temperature rise to 430 C (1090 F) above which
patient with normal thermal regulation may
suffer tissue damage
1 Hr continuous scanning at 4 W/kg (1st Level Controlled)
2 Hr continuous scanning at 2 W/kg (Normal Mode)
.3 types of metals - ANSWER-Austinitic, Martenitic, Ferritic
.5 G = ___ mT - ANSWER-5 G = 0.5 mT
.A fixed difference in a magnetic field across space - ANSWER-Spatial Gradient
.ACR - MRI Safety during pregnancy - ANSWER-Can be accepted at any stage of pregnancy.
Level 2-designated attending radiologist to confer with ordering physician and determine that
the risk-vs-benefit ratio to the patient warrants the study
.ACR states informed consent in pregnant patients is / is not required - ANSWER-is not
required.
, .American Board of Magnetic Resonance Safety ABMRS provides MR Safety Credentialing for:
- ANSWER-MR Medical Director (MRMD)
MR Safety Officers (MRSO)
MR Safety Experts (MRSE)
.An item that poses no known hazards
resulting from exposure to any MR environment - ANSWER-MR Safe
.An item which poses unacceptable risks
to the patient, medical staff or other
persons within the MR environment - ANSWER-MR Unsafe
.An item with demonstrated safety
in the MR environment within defined conditions - ANSWER-MR Conditional
.Any area 5 gauss or higher is zone ________ and must have _________ access - ANSWER-4 -
restricted access
.Any metallic object will never be labeled as - ANSWER-MRI Safe
.B1 is - ANSWER-RF Power
.Big Gradients allow smaller.. - ANSWER-FOV, Shorter echo times, thinner slices
.Biologic effects of Static magnetic field: - ANSWER-Vertigo, Metallic taste,
Magnetophosphenes, Magnetohydromagnetic effect, EKG perturbances, nystagmus
.Bo - ANSWER-Static magnetic field direction
