What is the unit of measurement for the strength of a magnetic field?

1 Tesla = ____ Gauss

What is the purpose of the magnetic field in MR imaging?

What is the purpose of the gradient coils within the MRI bore?

What is the purpose of the RF coils within the MRI bore?

Which kinds of metals are attracted to the magnetic field of the MRI magnet and why?

Examples of ferrous metals?

Examples of nonferrous metals?

Why are some patients allowed to keep their wedding bands on if they cannot be removed for the MRI exam?

Atomic Number

Mass number

Isotopes

Ions

Anion

Cation

Spin

Angular Momentum

Magnetic Moment

What is the most important MR active nuclei in the human body and why?

Spin-Up Nuclei
AKA parallel

Spin-Down Nuclei
AKA - antiparallel

Why is it true that in an external magnetic field, the number of Hydrogen protons will be equal as parallel and antiparallel?

Net Magnetization Vector (NMV)

Under a stronger magnetic field (3T), the NMV is _____ compared to a weaker magnetic field (1.5T).

Precession

Precessional Frequency

Which principle governs the precessional frequency of Hydrogen protons in a magnetic field?

Resonance

Excitation

For resonance to occur in Hydrogen protons, the RF pulses must be applied at the exact ______ ______ to cause the protons to tip on their axis.

Relaxation

Of these three phenomenon: excitation, resonance, relaxation; which one will produce a signal for the RF coils to detect?

T1 is ___ as long as T2

T1 relaxation times vary depending on:

T2 decay times vary depending on:

Why is the sum vector (NMV) so important?

What are the characteristics of a T1 image?

On a T1 weighted image, how does pathology usually appear?

On a T2 weighted image, what do the tissue characteristics usually appear as?

On a T2 weighted image, how does pathology usually appear?