Magnetic Resonance Imaging

All electromagnetic radiation will cause ionization of matter.

false

MRI uses ionizing radiation to create diagnostic images.

false

Which particle of the atom is used to create the MRI image?

protons

Magnetic strength is measured in

tesla

What type of nonionizing radiation is used for MRI?

radiofrequency

The source of magnetic fields within the body that create an MR signal

is the spinning nucleus of an atom

Which of the following is not a characteristic of a superconducting magnet?

It uses liquid cryogens to control heat

Electrical current flows without resistance

The magnet can never be turned off

The field strengths can be measured in Tesla

The magnet can never be turned off

Claustrophobic patients will have no problem having an MRI performed.

false

Which of the following is not a contraindication for entering the MRI suite?

Infusion pump

Cardiac pacemaker

Aneurysm clips

Fiberglass cast on wrist

Fiberglass cast on wrist

An image acquisition that divides the body into front and back halves is called a(n) ____________ projection.

coronal

Under normal conditions, the MR magnetic field is always on.

true

When charged particles spin, they create a magnetic field.

true

When current flows through a wire, it creates a

magnetic field

This component of the MRI system is used to transmit and receive electromagnetic radiation from the patient (Remember, what EM radiation is used with MRI).

Radio Frequency Coils

The nuclei from _____________ atoms are used to create MRI images.

hydrogen

To produce magnetic field gradients in MRI, electromagnetic gradient coils are oriented in

three dimensions

During MRI imaging, gradient coils will control the plane of the body part being imaged.

true

Quenching the MRI magnet is performed routinely to promote proper equipment maintenance.

false

Which MRI safety zone is used for preparing and screening the patient?

zone 2

Contrast enhanced MRI images use ____________ as the contrast media of choice.

gadolinium