The MRI Suite 3

Is the MRI magnet ever turned off?

No. The MRI magnet is always on unless it has been ramped down or quenched.

Where is the magnetic field strength the greatest in an MRI?

It is strongest near the bore (center) of the magnet.

What is the fringe magnetic field?

The fringe field is the magnetic field that extends outside the main magnet and surrounds it.

Why are non-MRI-safe objects not allowed within the fringe field?

Because they can be pulled toward the magnet and become dangerous projectiles.

What are the five main types of MRI injuries?

1. Burns due to electrical leads or skin-to-skin contact (most common) 2. Projectile injuries 3. Malfunction of electronic medical devices 4. Torqueing or movement of metallic objects or implants 5. Cryogen gas hazards from superconducting systems.

How can MRI injuries be prevented?

By proper patient and employee screening before entering the MRI suite.

Why must screening forms be completed for all patients entering the MRI suite?

To identify any metallic objects, implants, or devices that could pose a safety risk in the magnetic field.

What happens if a non-MRI-safe ferromagnetic object enters the MRI suite?

It can become a projectile and may cause severe or fatal injury.

Who must be screened before entering the MRI suite?

All individuals including patients, healthcare workers, and maintenance staff.

What kind of equipment should be used in the MRI suite?

Specialized non-ferrous (non-metallic) MRI-safe equipment such as wheelchairs, IV poles, and stretchers.

What is the 5-gauss line in MRI safety?

The boundary beyond which the magnetic field strength exceeds 5 gauss; no non-MRI-safe objects should cross this line.

List examples of objects that should never be brought within the 5-gauss line.

Oxygen bottles, patient beds or carts, IV poles, hair clips, stethoscopes, and monitoring equipment.

What should you do if you are unsure whether an object is MRI safe?

Do not take it into the MRI suite.

What determines how strongly a metallic object is pulled toward the MRI magnet?

The larger the object and the closer it is to the magnet, the greater the magnetic force.

Why must the MRI suite be secured and posted with warning signs?

To limit access, prevent accidental entry, and warn of the magnetic hazards present in the MRI environment.

What type of signage should be posted around the MRI suite?

Warning signs that clearly indicate a strong magnetic field and the dangers of entering without authorization or screening.