MRSO practice exam work with
questions and answers 2024
MRSO practice exam work with
questions and answers
FDA - MRI Safety during pregnancy - FDA -
The safety of MR imaging during pregnancy
has not been proved.
ISMRM - MRI Safety during pregnancy - ISMRM-
"MR Imaging may be used in pregnant women if
other nonionizing forms of diagnostic imaging are
inadequate or if the examination provides
important information that would otherwise require
exposure to ionizing radiatio
ACR - MRI Safety during pregnancy - 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
What needs to be documented in the pregnant patient's chart? (3) - 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 - is not required.
Gadolinium use with pregnant patients - Should not be routinely used in pregnant
patients
The decision to use gadolinium contrast in a pregnant patient must be made by - 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 - 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 - thorough and conscientious screening of persons and
devices approaching Zone IV
The use of metal detectors in MRI is - discouraged
How do ferromagnetic detectors work? - Ferromagnetic detectors "monitor" the
surrounding magnetic fields. When something ferromagnetic moves it distorts the
surrounding
magnetic field, Ferromagnetic detectors sense
that change.
List 3 types of ferromagnetic detectors used in MRI - Single pillar (screener), hand held
(not for full body screening), doorway (less sensitive - best for large metallic objects)
Where should pillar ferromagnetic detectors be located? - In zone 2 - before zone 3.
How should MR staff dress? - Ferromagnetic free
What are some ways to ease anxiety / claustrophobia in patients? - Don't rush them,
allow them to ask questions.
Offer them a cloth to cover their eyes
Aromatherapy
Stay in contact with the patient until they tell you they're comfortable within the bore
What unit is used to measure static magnetic field strength INSIDE the magnet? - Tesla
What unit is used to measure static magnetic field strength OUTSIDE the magnet? -
Gauss
1 Tesla = ______________ Gauss - 1 Tesla = 1000 gauss
1 mT = _______________ Gauss - 1/1,000 T (or 10 (-3) T) = 10 G
5 G = ___ mT - 5 G = 0.5 mT
FDA Guidelines for exposure to magnetic field Adults and infants > 1 mo of age: - 8 T
FDA Guidelines for exposure to magnetic field for infants < 1 mo of age: - 4 T
What are the 3 Static Magnetic Field Forces? - Rotation
Translation
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