MRI Safety Flashcards
6 cards from real MRI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 MRI Safety flashcards as text
Which MRI screening form section is most critical for identifying implanted devices that may be MR Unsafe?
Answer: Implants and devices section
The implants and devices section identifies items such as pacemakers, cochlear implants, and aneurysm clips that may be MR Unsafe.
What is a 'quench' in MRI terminology?
Answer: A sudden loss of superconductivity causing helium boil-off
A quench occurs when the superconducting magnet loses its superconducting state, causing liquid helium to vaporize rapidly and potentially displacing oxygen in the room.
MR Conditional implants are safe to scan only when:
Answer: Specific conditions of field strength, SAR, and gradient limits are met
MR Conditional devices are safe only when the defined conditions of use (field strength, SAR, gradient dB/dt, scan duration) are strictly followed.
Which of the following is a documented risk of MRI during the first trimester of pregnancy?
Answer: All of the above except ionizing radiation
MRI does not use ionizing radiation, but first-trimester risks include acoustic noise and potential gadolinium retention; non-contrast scanning is preferred.
What minimum distance from the MRI magnet bore is generally recommended to keep unsecured ferromagnetic oxygen cylinders?
Answer: Distance depends on field strength and cylinder size
The safe exclusion zone for ferromagnetic oxygen cylinders depends on both the scanner's field strength and the cylinder size, so no single fixed distance applies universally.
Which labeling term indicates that an item has been tested and poses no known hazards in ALL MRI environments?
Answer: MR Safe
The ASTM 'MR Safe' label means the item poses no known hazards in all MRI environments and is made of non-conductive, non-magnetic, non-RF-reactive materials.