MRI MRI Safety 2

Question 1

Which MRI screening form section is most critical for identifying implanted devices that may be MR Unsafe?

Accepted Answer

Implants and devices section

Answer

The implants and devices section identifies items such as pacemakers, cochlear implants, and aneurysm clips that may be MR Unsafe.

Question 2

What is a 'quench' in MRI terminology?

Accepted Answer

A sudden loss of superconductivity causing helium boil-off

Answer

A quench occurs when the superconducting magnet loses its superconducting state, causing liquid helium to vaporize rapidly and potentially displacing oxygen in the room.

Question 3

MR Conditional implants are safe to scan only when:

Accepted Answer

Specific conditions of field strength, SAR, and gradient limits are met

Answer

MR Conditional devices are safe only when the defined conditions of use (field strength, SAR, gradient dB/dt, scan duration) are strictly followed.

Question 4

Which of the following is a documented risk of MRI during the first trimester of pregnancy?

Accepted Answer

All of the above except ionizing radiation

Answer

MRI does not use ionizing radiation, but first-trimester risks include acoustic noise and potential gadolinium retention; non-contrast scanning is preferred.

Question 5

What minimum distance from the MRI magnet bore is generally recommended to keep unsecured ferromagnetic oxygen cylinders?

Accepted Answer

Distance depends on field strength and cylinder size

Answer

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.

MRI - Magnetic Resonance Imaging Practice Test

MRI - Magnetic Resonance Imaging Practice Test

MRI MRI Safety 2