MRI MRI Safety

Question 1

Which MRI zone is defined as the area containing the MRI scanner itself where the static magnetic field is always present?

Accepted Answer

Zone IV

Answer

Zone I

Answer

Zone II

Answer

Zone III

Question 2

A patient reports having a cardiac pacemaker. What is the standard MRI safety classification for most older pacemakers?

Accepted Answer

MR Unsafe

Answer

MR Safe

Answer

MR Conditional

Answer

MR Compatible

Question 3

What is the main biological risk associated with rapidly switching gradient magnetic fields during an MRI scan?

Accepted Answer

Peripheral nerve stimulation

Answer

Radiofrequency burns

Answer

Acoustic damage

Answer

Hypothermia

Question 4

Which SAR limit (Specific Absorption Rate) is the FDA guideline for whole-body RF energy deposition in a 15-minute period for non-controlled conditions?

Accepted Answer

4 W/kg

Answer

1.5 W/kg

Answer

2 W/kg

Answer

3 W/kg

Question 5

A patient with a metallic foreign body in the eye should be evaluated with which imaging modality BEFORE entering the MRI suite?

Accepted Answer

CT scan

Answer

Ultrasound

Answer

Bone scan

Answer

PET scan

Question 6

What term describes an object becoming a high-speed projectile when brought near a strong MRI magnetic field?

Accepted Answer

Missile effect

Answer

Quenching effect

Answer

Gradient artifact

Answer

Susceptibility effect