MRI - PRELIM L3

Question 1

The intrinsic angular momentum of
an atomic nucleus, much like how electrons have spin. The
concept comes from quantum mechanics and describes a
property of nucleons (protons and neutrons) inside the nucleus

Answer 1

Nuclear Spin

Question 2

Determines the energy levels of the nucleus in an external magnetic field, which can be detected and used to gather information about the environment around the nucleus.

Answer 2

Nuclear Spin

Question 3

TRUE OR FALSE

The value of the nuclear spin depends on the number
and types of nucleons in the nucleus

Answer 3

TRUE

Question 4

Nuclei with an even number of nucleons usually have ________ nuclear spin

Answer 4

Zero

Question 5

Nuclei with an odd number of nucleons often have ________ nuclear spin

Answer 5

Non-zero

Question 6

A fundamental law of physics states that a spinning, charged mass induces a magnetic field about itself.

Answer 6

Magnetic Moment

Question 7

The nucleus is a spinning, charged particle and
therefore has an associated magnetic field. This
field is given the special name of

Answer 7

Nuclear Magnetic Moment

Question 8

Ratio of the magnetic moment to the angular momentum of a particle; this is a constant for a given nucleus

Answer 8

Gyromagnetic Ratio

Question 9

Gyromagnetic Ratio is measured in _______

Answer 9

MHz / T

Question 10

The frequency of precession for nuclei with non-zero spin is _______ to the gyromagnetic ratio

Answer 10

Directly Proportional

Question 11

Mew (μ) corresponds to the _________

Answer 11

Magnetic Moment of a Particle

Question 12

The angular momentum or spin of the particle is represented by ____

Answer 12

J

Question 13

The Gyromagnetic Ratio for Hydrogen-1 is ______

Answer 13

42.6 MHz/T

Question 14

The Gyromagnetic Ratio for Fluorine is ______

Answer 14

40.1 MHz/T

Question 15

The Gyromagnetic Ratio for Phosphorus is ______

Answer 15

17.2 MHz/T

Question 16

The Gyromagnetic Ratio for Sodium is ______

Answer 16

11.3 MHz/T

Question 17

The Gyromagnetic Ratio for Carbon is ______

Answer 17

10.7 MHz/T

Question 18

The Gyromagnetic Ratio for Hydrogen-2 is ______

Answer 18

6.5 MHz/T

Question 19

The Gyromagnetic Ratio for Oxygen is ______

Answer 19

5.8 MHz/T

Question 20

The Gyromagnetic Ratio for Potassium is ______

Answer 20

2.0 MHz/T

Question 21

A single, isolated nucleus is never observed, just collections of
similar nuclei as an ______

Answer 21

Aggregate

Question 22

The Aggregate of Spins is sometimes called as _________ to emphasize the bulk of the signal-producing nuclear spins.

Answer 22

Ensemble of Spins

Question 23

Net Magnetization formula is written as:

Answer 23

M = Σμ

Question 24

The process by which atomic nuclei are exposed to a strong magnetic field and then to a pulse of radiofrequency energy.

Answer 24

Resonance

Question 25

The specific frequency at which this energy is absorbed by the nuclei is called the _________

Answer 25

Resonance Frequency

Question 26

The electromagnetic radiation produced by the oscillator is called a ________

Answer 26

Radiofrequency Emission

Question 27

An electromagnetic emission such as a radiofrequency (RF) is composed of an oscillating electric field positioned _______ to an oscillating magnetic field.

Answer 27

90 Degrees

Question 28

The formula for Larmor Frequency is written as _______

Answer 28

f = γB0

Question 29

Used by mathematicians to diagram phenomena in space(X, Y, and Z) drawn perpendicular to one another to describe a coordinate system.

Answer 29

Cartesian Coordinate System

Question 30

A quantity that has direction

Answer 30

Vector

Question 31

Which tissue has the highest Relative Spin Density and how many ?

Answer 31

Cerebrospinal Fluid = 100

Question 32

As a hydrogen nuclei relax, they emit radiofrequency signals at the same frequency they absorbed when they were flipped.

Answer 32

Signal Emission

Question 33

Represents a loss of net XY magnetization and the loss of phase coherence in a plane perpendicular to or transverse to M0

Answer 33

T2 Relaxation Time

Question 34

It is the amount of time for the transverse magnetization to reach equilibrium

Answer 34

T1 Relaxation Time

Question 35

It is reasonable to expect that one of the parameters that affects the amplitude of the magnetic resonance (MR signal) might be the _________ within the volume of the sample

Answer 35

Number of Hydrogen Nuclei