MRI QUIZ REVIEW

What is a disadvantage of MRI scans?

The scan time.

What is a quench in the context of MRI?

A serious potential hazard to the electromagnet that can cause hazardous asphyxiation to the patient and workers.

Which patients should never undergo MRI exams?

Patients with surgical clips, implanted defibrillators, and/or pacemakers.

What must anyone do before entering the MRI room?

Be screened prior to entry.

How do open MRI units assist patients?

They help scan claustrophobic patients and are quite successful.

What are some common characteristics of MRI and CT?

3D Imaging, produces multiplanar images, and utilize computers.

What is a key benefit of MRI imaging for pregnant patients?

It is non-invasive and painless.

What technology does MRI use to create images?

Magnetism and radiofrequency waves.

When are MRI scans typically performed on post-traumatic brain injury patients?

24-72 hours after the injury.

How is Tesla related to Gauss in MRI measurements?

1 Tesla = 10,000 Gauss.

What is the most common contrast agent used in MRI scans?

Gadolinium.

What determines slice thickness in MRI imaging?

The gradient coils.

What are the two types of coils utilized in MRI?

RF coil and Surface coil.

What is the function of the RF coil in MRI?

It acts like a receiver for the signal.

How is a superconductive magnet cooled in MRI?

By Helium and nitrogen.

What is precession in the context of MRI?

It refers to the wobble of the magnetic moments.