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Practice Set (2) - Basic Principles

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Diploma MR Quiz on Practice Set (2) - Basic Principles, created by S L on 09/01/2016.
S L
Quiz by S L, updated more than 1 year ago
S L
Created by S L over 9 years ago
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Question 1

Question
With the exception of hydrogen, all matter is composed of three components. They are
Answer
  • Electrons, Photons, Protons
  • Electrons, Neutrons, Photons
  • Protons, Neutrons, Photons
  • Neutrons, Electrons, Protons

Question 2

Question
The negatively charged component of an atom is called the
Answer
  • Electron
  • Proton
  • Negatron
  • Neutron

Question 3

Question
The positively charged component of an atom is called the
Answer
  • Electron
  • Proton
  • Positron
  • Neutron

Question 4

Question
The neutral component of an atom is called the
Answer
  • Electron
  • Proton
  • Neutron
  • Photon

Question 5

Question
The nucleus of the hydrogen atom is made up of one
Answer
  • Neutron
  • Electron
  • Photon
  • Proton

Question 6

Question
Materials reach their highest magnetic potential when their atoms are grouped in areas known as
Answer
  • Regions
  • Fields
  • Fringes
  • Domains

Question 7

Question
Material that is weakly attracted to a magnetic field is said to be
Answer
  • Electromagnetic
  • Paramagnetic
  • Ferromagnetic
  • Diamagnetic

Question 8

Question
Material that is strongly attracted to a magnetic field is said to be
Answer
  • Electromagnetic
  • Paramagnetic
  • Ferromagnetic
  • Diamagnetic

Question 9

Question
Material that is slightly repelled from a magnetic field is said to be
Answer
  • Resistive
  • Paramagnetic
  • Ferromagnetic
  • Diamagnetic

Question 10

Question
Three types offerromagnetic material are
Answer
  • Copper, Titanium, Aluminum
  • Iron, Cobalt, Nickel
  • Bronze, Niobium, Tin
  • None of the above

Question 11

Question
To exist, magnets must have two poles, therefore they are commonly called
Answer
  • Vectors
  • Dipoles
  • Axis
  • A and C

Question 12

Question
The lines that represent the field of a magnet are known as
Answer
  • Flux lines
  • Intensity lines
  • Induction lines
  • Faraday lines

Question 13

Question
The strength of a magnet is measured by its
Answer
  • Signal intensity
  • Induction ability
  • Flux density
  • None of the above

Question 14

Question
The strength of an MRI magnet is most commonly represented by a unit of measurement called
Answer
  • Amps
  • Kilogauss
  • Tesla
  • Ohms

Question 15

Question
10,000 gauss is equal to
Answer
  • 1.0 amp
  • 1.0 ohm
  • 1.0 tesla
  • 10 tesla

Question 16

Question
15,000 gauss is equal to
Answer
  • 1.5 amps
  • 1.5 ohms
  • 1.5 tesla
  • 15 tesla

Question 17

Question
The law that is used in MRI to describe how a magnetic field is induced by flowing current is known as
Answer
  • Damadian's Law
  • Murphy's Law
  • Newton's Law
  • Faraday's Law

Question 18

Question
Which of the following is an advantage of a permanent magnet MRI system?
Answer
  • Very heavy
  • Low operating costs
  • Fixed field strength

Question 19

Question
What type of molecule makes up 500/0 to 90% of a person's total body weight?
Answer
  • Fat
  • Oxygen
  • Water
  • Nitrogen

Question 20

Question
Clinical MRl is based on the generation of signal from the nucleus of which atom?
Answer
  • Helium
  • Nitrogen
  • Oxygen
  • Hydrogen

Question 21

Question
The nucleus of the hydrogen atom carries what type of charge?
Answer
  • Negative
  • Positive
  • Neutral

Question 22

Question
The spin of the proton of the hydrogen atom is known as
Answer
  • Nuclear spin
  • Axial momentum
  • Hydraulic spin
  • Angular momentum

Question 23

Question
Because the nucleus of the hydrogen atom acts much like a bar magnet it is said to have a
Answer
  • Magnetic ratio
  • Magnetic moment
  • Larmor ratio
  • Frequency ratio

Question 24

Question
Because the spinning nucleus of the hydrogen atom has both a North and South pole it is commonly called a
Answer
  • Electromagnet
  • Bar magnet
  • Dipole

Question 25

Question
When placed in an external magnetic field, hydrogen nuclei
Answer
  • Resonate
  • Become excited
  • Become aligned
  • Repel each other

Question 26

Question
After being placed in an external magnetic field, high energy hydrogen nuclei point in which direction?
Answer
  • Parallel
  • Anti-paired
  • Anti-parallel
  • Perpendicular

Question 27

Question
After being placed in an external magnetic field, low energy hydrogen nuclei point in which direction?
Answer
  • Parallel
  • Anti-paired
  • Anti-parallel
  • Perpendicular

Question 28

Question
When placed in an external magnetic field, the hydrogen nuclei that are of clinical interest are
Answer
  • Parallel paired
  • Anti-parallel paired
  • Parallel unpaired
  • Perpendicular paired

Question 29

Question
When a patient is placed in an external magnetic field, the number of unmatched hydrogen protons usually equals
Answer
  • One billion
  • One million
  • Few per million
  • Few per billion

Question 30

Question
The sum of all of the unmatched parallel protons in an external magnetic field makes up what is called the
Answer
  • External magnetization
  • Internal magnetization
  • Resonant magnetization
  • Net magnetic vector

Question 31

Question
The type of rotation that is displayed by hydrogen nuclei in an external magnetic field is known as
Answer
  • Magnetization
  • Relaxation
  • Precession
  • Resonance

Question 32

Question
Within a perfect magnetic field all protons rotate at
Answer
  • Different frequencies
  • The same frequency
  • Undetermined frequencies
  • None of the above

Question 33

Question
The speed at which protons rotate in an external magnetic field is known as
Answer
  • Precessional frequency
  • Hydromagnetic frequency
  • External magnetic frequency
  • None of the above

Question 34

Question
The ratio that describes the constant at which any magnetic nucleus will precess in a 1 tesla magnet is known as
Answer
  • Precessional ratio
  • Magnetogyric ratio
  • Gyromagnetic ratio
  • Both B and C

Question 35

Question
The precessional frequency of magnetic nuclei is determined by which of the following?
Answer
  • The strength of the external magnetic field
  • The magnetogyric frequency
  • The gyromagnetic ratio of the specific nuclei
  • Both A and C

Question 36

Question
The equation that is used to determine the precessional frequency of magnetic nuclei is known as
Answer
  • Faraday's equation
  • Fast Fourier transformations
  • Damadian's equation
  • Larmor equation

Question 37

Question
The stronger the magnetic field the ________ the precessional frequency
Answer
  • Stronger
  • Higher
  • Longer
  • Shorter

Question 38

Question
Which of the following is the equation that is used to determine precessional frequencies?
Answer
  • Wo=yBo
  • Bo=yWo
  • F= yBo
  • A and C

Question 39

Question
Alignment of the net magnetic vector in the direction of the external magnetic field is known as
Answer
  • Transverse magnetization
  • Longitudinal magnetization
  • Equilibrium
  • B and C

Question 40

Question
Magnetization in the XY plane is known as
Answer
  • Equilibrium
  • Longitudinal magnetization
  • Transverse magnetization
  • Spin-Lattice magnetization

Question 41

Question
When the proper radio frequency is applied, the precessing hydrogen nuclei begin to
Answer
  • Dephase
  • Rephase
  • Relax
  • Resonate

Question 42

Question
The RF pulse used to move nuclei into a higher energy state is at a frequency known as
Answer
  • Resonance frequency
  • Fourier frequency
  • Transverse frequency
  • None of the above

Question 43

Question
Hydrogen nuclei begin to precess in phase when which of the following occurs?
Answer
  • The proper RF is turned off
  • The patient is placed into the external magnet
  • The proper RF is turned on
  • None of the above

Question 44

Question
When the radio frequency is turned off, precessing nuclei begin to
Answer
  • Relax
  • Lose energy
  • Dephase
  • All of the above

Question 45

Question
Another name for transverse relaxation is
Answer
  • Spin-lattice relaxation
  • T1 relaxation
  • Spin-Spin relaxation
  • Longitudinal relaxation

Question 46

Question
Another name for Tl relaxation is
Answer
  • Dephasing
  • Longitudinal relaxation
  • Spin-Spin relaxation
  • Transverse relaxation

Question 47

Question
The return of longitudinal magnetization to equilibrium is known as
Answer
  • T1 relaxation
  • Spin-Lattice relaxation
  • Longitudinal relaxation
  • All of the above

Question 48

Question
Dephasing of the net vector in the transverse plane is known as
Answer
  • T1 relaxation
  • Spin-Lattice relaxation
  • Longitudinal relaxation
  • Spin-Spin relaxation

Question 49

Question
The time it takes for a tissue's bulk longitudinal magnetization to return to 63% of its original value is known as
Answer
  • T1 relaxation time
  • T2 relaxation time
  • T2* relaxation time
  • None of the Above

Question 50

Question
The time it takes for transverse magnetization to decay to 37% of its original value is known as
Answer
  • T1 relaxation time
  • T2 relaxation time
  • T2* relaxation time

Question 51

Question
Dephasing ofthe net vector in the transverse plane is caused by two factors, imperfections in the external magnetic field and
Answer
  • The application of the 180 degree RF pulse
  • The application of a 90 degree RF pulse
  • Interaction between surrounding nuclei
  • None of the above

Question 52

Question
Magnetization in the transverse plane can also be known as
Answer
  • Mz
  • Mxy
  • M0
  • Both B and C

Question 53

Question
Magnetization in the longitudinal plane can also be known as
Answer
  • Mz
  • Equilibrium
  • Mxy
  • A and B

Question 54

Question
MRI signals can only be detected in which ofthe following planes
Answer
  • Z plane
  • XY plane
  • Transverse plane
  • B and C

Question 55

Question
~~ The signal created after applying a 90 degree RF pulse is known as a
Answer
  • Gradient echo signal
  • Spin echo
  • Spin spin signal
  • Fill signal

Question 56

Question
The signal produced after the 180 degree RF pulse is applied is known as a
Answer
  • Gradient echo signal
  • Spin echo signal
  • Spin spin signal
  • Fill signal

Question 57

Question
A 180 degree RF pulse is used to ________ the dephasing net vector in the transverse plane
Answer
  • Magnetize
  • Decay
  • Delay
  • Refocus

Question 58

Question
The larger the net magnetic vector in the transverse plane the _______  the signal that is produced
Answer
  • Smaller
  • Stronger
  • Weaker
  • None of the above

Question 59

Question
The smaller the net magnetic vector in the transverse plane the signal that is produced
Answer
  • Larger
  • Stronger
  • Weaker
  • None of the above

Question 60

Question
The letters FID in an Fill signal stand for
Answer
  • Field image dimensions
  • Free induction decay
  • Field induction direction
  • Free image direction

Question 61

Question
The type of signal that is created after a gradient is used to refocus the dephasing net vector is known as
Answer
  • Spin echo signal
  • Gradient echo signal
  • Fill signal
  • None of the above

Question 62

Question
The time between two successive 90 degree RF pulses is known as
Answer
  • Echo time
  • Repetition time
  • Inversion time
  • Relaxation time

Question 63

Question
The time between the 90 degree RF pulse and the spin echo signal in a spin echo pulse sequence is known as
Answer
  • Echo time
  • Repetition time
  • Inversion time
  • Relaxation time

Question 64

Question
In an inversion recovery pulse sequence, the time between the 180 degree RF pulse and the 90 degree RF pulse is known as
Answer
  • Echo time
  • Repetition time
  • Inversion time
  • Relaxation time
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