NMRI

The property of nuclei that allows them to have magnetism

• spin

• resonance

• charge

• mass

When an external magnetic field is applied the nuclei will align up imperfectly causing

• precession

• ascension

• precipitation

• radio frequency emission

The frequency of precession called the __________ frequency, which depends upon the nature of the nucleus and the strength of the magnetic field.

• Lamour

• Lemon

• Le Tour

• Lemur

When a short pulse of RF waves are applied at the

• same frequency of precession of the H nuclei, they will resonate

• same frequency of the H nuclei, they will resonate

• same frequency of precession of the magnetic field, they will resonate

• same frequency of the non-uniform magnetic field, they will resonate

When the RF pulse ends the nuclei will return to their equilibrium state after a short time, called the

• relaxation time

• reparation time

• retrieval time

• revolution time

Hydrogen is used for nuclear magnetic resonance imaging

• due to its abundance in living tissue

• due to its relative atomic mass number being low

A patient undergoing a scan is placed inside a

• a very large uniform magnetic field (about 1 T)

• a very large magnetic field (about 1 T)

• a very large non-uniform magnetic field (about 1 T)

• a uniform magnetic field (about 1 T)

In order to locate a particular position of hydrogen atoms within a patient

• a non-uniform magnetic field is also applied

• a uniform magnetic field is also applied

• a non-uniform electric field is also applied

• the RF pulse is turned on and off

The combined effect of the two magnetic fields

• creates a unique total magnetic field strength at each point in the patient

• creates a uniform total magnetic field strength at each point in the patient

The RF pulse is transmitted to the patient by means of

• electromagnetic coils

• circuits

• permanent magnets

• capacitors