MRI

Change in the direction of axis of rotation is known as

• moment.

• precession.

• frequency.

• speed of rotation.

NMRI stands for

• non-magnetic resonance imaging

• nuclear magnetic resonance imaging

• non-magnetic radiation imaging

MRI scanners use _______________ and ____________ to generate images of the organs in the body.

• strong electric fields, gamma ray

• strong electric fields, radio frequency

• strong magnetic fields, radio frequency

• strong magnetic fields, gamma ray

The nuclei of certain atoms have a property called _________ that cause them to behave as ___________ in a magnetic field.

• quarks, tiny charge

• quarks, tiny magnet

• spin, tiny charge

• spin, tiny magnets

In MRI, it is usually the nuclei of _________ atoms that are studied.

• oxygen

• hydrogen

• phosphorus

• carbon

Most protons line up with their N poles facing the S pole of the external field (parallel), have a _________ energy state.

• high

• low

Radio waves have ________ frequency to the Larmor frequency.

• similar

• different

If a pulse of electromagnetic radiation of the same frequency as Larmor frequency is incident on precessing nuclei, the nuclei will __________.

• resonate

• vibrate

• at rest.

• spin

A short time after the incident pulse has ended, the nuclei will return to their equilibrium state, emitting _______ radiation.

• radio frequency

• microwave frequency

• X-ray

The short time between the end of the RF pulse and the re-emitting of the radiation is known as the ______________ time.

• relaxation

• rest

• precession

• Larmor