4284714
Pregunta 1
Pregunta
With the exception of hydrogen, all matter is composed of three components.
They are
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Electrons, Photons, Protons
-
Electrons, Neutrons, Photons
-
Protons, Neutrons, Photons
-
Neutrons, Electrons, Protons
Pregunta 2
Pregunta
The negatively charged component of an atom is called the
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Electron
-
Proton
-
Negatron
-
Neutron
Pregunta 3
Pregunta
The positively charged component of an atom is called the
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Electron
-
Proton
-
Positron
-
Neutron
Pregunta 4
Pregunta
The neutral component of an atom is called the
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Electron
-
Proton
-
Neutron
-
Photon
Pregunta 5
Pregunta
The nucleus of the hydrogen atom is made up of one
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Neutron
-
Electron
-
Photon
-
Proton
Pregunta 6
Pregunta
Materials reach their highest magnetic potential when their atoms are grouped in areas known as
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Regions
-
Fields
-
Fringes
-
Domains
Pregunta 7
Pregunta
Material that is weakly attracted to a magnetic field is said to be
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Electromagnetic
-
Paramagnetic
-
Ferromagnetic
-
Diamagnetic
Pregunta 8
Pregunta
Material that is strongly attracted to a magnetic field is said to be
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Electromagnetic
-
Paramagnetic
-
Ferromagnetic
-
Diamagnetic
Pregunta 9
Pregunta
Material that is slightly repelled from a magnetic field is said to be
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Resistive
-
Paramagnetic
-
Ferromagnetic
-
Diamagnetic
Pregunta 10
Pregunta
Three types offerromagnetic material are
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Copper, Titanium, Aluminum
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Iron, Cobalt, Nickel
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Bronze, Niobium, Tin
-
None of the above
Pregunta 11
Pregunta
To exist, magnets must have two poles, therefore they are commonly called
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Vectors
-
Dipoles
-
Axis
-
A and C
Pregunta 12
Pregunta
The lines that represent the field of a magnet are known as
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Flux lines
-
Intensity lines
-
Induction lines
-
Faraday lines
Pregunta 13
Pregunta
The strength of a magnet is measured by its
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Signal intensity
-
Induction ability
-
Flux density
-
None of the above
Pregunta 14
Pregunta
The strength of an MRI magnet is most commonly represented by a unit of
measurement called
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Amps
-
Kilogauss
-
Tesla
-
Ohms
Pregunta 15
Pregunta
10,000 gauss is equal to
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1.0 amp
-
1.0 ohm
-
1.0 tesla
-
10 tesla
Pregunta 16
Pregunta
15,000 gauss is equal to
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1.5 amps
-
1.5 ohms
-
1.5 tesla
-
15 tesla
Pregunta 17
Pregunta
The law that is used in MRI to describe how a magnetic field is induced by
flowing current is known as
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Damadian's Law
-
Murphy's Law
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Newton's Law
-
Faraday's Law
Pregunta 18
Pregunta
Which of the following is an advantage of a permanent magnet MRI
system?
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Very heavy
-
Low operating costs
-
Fixed field strength
Pregunta 19
Pregunta
What type of molecule makes up 500/0 to 90% of a person's total body
weight?
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Fat
-
Oxygen
-
Water
-
Nitrogen
Pregunta 20
Pregunta
Clinical MRl is based on the generation of signal from the nucleus of which
atom?
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Helium
-
Nitrogen
-
Oxygen
-
Hydrogen
Pregunta 21
Pregunta
The nucleus of the hydrogen atom carries what type of charge?
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Negative
-
Positive
-
Neutral
Pregunta 22
Pregunta
The spin of the proton of the hydrogen atom is known as
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Nuclear spin
-
Axial momentum
-
Hydraulic spin
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Angular momentum
Pregunta 23
Pregunta
Because the nucleus of the hydrogen atom acts much like a bar magnet it is
said to have a
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Magnetic ratio
-
Magnetic moment
-
Larmor ratio
-
Frequency ratio
Pregunta 24
Pregunta
Because the spinning nucleus of the hydrogen atom has both a North and
South pole it is commonly called a
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Electromagnet
-
Bar magnet
-
Dipole
Pregunta 25
Pregunta
When placed in an external magnetic field, hydrogen nuclei
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Resonate
-
Become excited
-
Become aligned
-
Repel each other
Pregunta 26
Pregunta
After being placed in an external magnetic field, high energy hydrogen nuclei
point in which direction?
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Parallel
-
Anti-paired
-
Anti-parallel
-
Perpendicular
Pregunta 27
Pregunta
After being placed in an external magnetic field, low energy hydrogen nuclei
point in which direction?
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Parallel
-
Anti-paired
-
Anti-parallel
-
Perpendicular
Pregunta 28
Pregunta
When placed in an external magnetic field, the hydrogen nuclei that are of
clinical interest are
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Parallel paired
-
Anti-parallel paired
-
Parallel unpaired
-
Perpendicular paired
Pregunta 29
Pregunta
When a patient is placed in an external magnetic field, the number of
unmatched hydrogen protons usually equals
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One billion
-
One million
-
Few per million
-
Few per billion
Pregunta 30
Pregunta
The sum of all of the unmatched parallel protons in an external magnetic field
makes up what is called the
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External magnetization
-
Internal magnetization
-
Resonant magnetization
-
Net magnetic vector
Pregunta 31
Pregunta
The type of rotation that is displayed by hydrogen nuclei in an external
magnetic field is known as
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Magnetization
-
Relaxation
-
Precession
-
Resonance
Pregunta 32
Pregunta
Within a perfect magnetic field all protons rotate at
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Different frequencies
-
The same frequency
-
Undetermined frequencies
-
None of the above
Pregunta 33
Pregunta
The speed at which protons rotate in an external magnetic field is known as
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Precessional frequency
-
Hydromagnetic frequency
-
External magnetic frequency
-
None of the above
Pregunta 34
Pregunta
The ratio that describes the constant at which any magnetic nucleus will
precess in a 1 tesla magnet is known as
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Precessional ratio
-
Magnetogyric ratio
-
Gyromagnetic ratio
-
Both B and C
Pregunta 35
Pregunta
The precessional frequency of magnetic nuclei is determined by which of the
following?
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The strength of the external magnetic field
-
The magnetogyric frequency
-
The gyromagnetic ratio of the specific nuclei
-
Both A and C
Pregunta 36
Pregunta
The equation that is used to determine the precessional frequency of magnetic
nuclei is known as
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Faraday's equation
-
Fast Fourier transformations
-
Damadian's equation
-
Larmor equation
Pregunta 37
Pregunta
The stronger the magnetic field the ________ the precessional frequency
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Stronger
-
Higher
-
Longer
-
Shorter
Pregunta 38
Pregunta
Which of the following is the equation that is used to determine precessional
frequencies?
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Wo=yBo
-
Bo=yWo
-
F= yBo
-
A and C
Pregunta 39
Pregunta
Alignment of the net magnetic vector in the direction of the external
magnetic field is known as
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Transverse magnetization
-
Longitudinal magnetization
-
Equilibrium
-
B and C
Pregunta 40
Pregunta
Magnetization in the XY plane is known as
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Equilibrium
-
Longitudinal magnetization
-
Transverse magnetization
-
Spin-Lattice magnetization
Pregunta 41
Pregunta
When the proper radio frequency is applied, the precessing hydrogen nuclei
begin to
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Dephase
-
Rephase
-
Relax
-
Resonate
Pregunta 42
Pregunta
The RF pulse used to move nuclei into a higher energy state is at a frequency
known as
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Resonance frequency
-
Fourier frequency
-
Transverse frequency
-
None of the above
Pregunta 43
Pregunta
Hydrogen nuclei begin to precess in phase when which of the following
occurs?
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The proper RF is turned off
-
The patient is placed into the external magnet
-
The proper RF is turned on
-
None of the above
Pregunta 44
Pregunta
When the radio frequency is turned off, precessing nuclei begin to
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Relax
-
Lose energy
-
Dephase
-
All of the above
Pregunta 45
Pregunta
Another name for transverse relaxation is
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Spin-lattice relaxation
-
T1 relaxation
-
Spin-Spin relaxation
-
Longitudinal relaxation
Pregunta 46
Pregunta
Another name for Tl relaxation is
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Dephasing
-
Longitudinal relaxation
-
Spin-Spin relaxation
-
Transverse relaxation
Pregunta 47
Pregunta
The return of longitudinal magnetization to equilibrium is known as
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T1 relaxation
-
Spin-Lattice relaxation
-
Longitudinal relaxation
-
All of the above
Pregunta 48
Pregunta
Dephasing of the net vector in the transverse plane is known as
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T1 relaxation
-
Spin-Lattice relaxation
-
Longitudinal relaxation
-
Spin-Spin relaxation
Pregunta 49
Pregunta
The time it takes for a tissue's bulk longitudinal magnetization to return to
63% of its original value is known as
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T1 relaxation time
-
T2 relaxation time
-
T2* relaxation time
-
None of the Above
Pregunta 50
Pregunta
The time it takes for transverse magnetization to decay to 37% of its original
value is known as
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T1 relaxation time
-
T2 relaxation time
-
T2* relaxation time
Pregunta 51
Pregunta
Dephasing ofthe net vector in the transverse plane is caused by two factors, imperfections in the external magnetic field and
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The application of the 180 degree RF pulse
-
The application of a 90 degree RF pulse
-
Interaction between surrounding nuclei
-
None of the above
Pregunta 52
Pregunta
Magnetization in the transverse plane can also be known as
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Mz
-
Mxy
-
M0
-
Both B and C
Pregunta 53
Pregunta
Magnetization in the longitudinal plane can also be known as
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Mz
-
Equilibrium
-
Mxy
-
A and B
Pregunta 54
Pregunta
MRI signals can only be detected in which ofthe following planes
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Z plane
-
XY plane
-
Transverse plane
-
B and C
Pregunta 55
Pregunta
~~ The signal created after applying a 90 degree RF pulse is known as a
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Gradient echo signal
-
Spin echo
-
Spin spin signal
-
Fill signal
Pregunta 56
Pregunta
The signal produced after the 180 degree RF pulse is applied is known as a
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Gradient echo signal
-
Spin echo signal
-
Spin spin signal
-
Fill signal
Pregunta 57
Pregunta
A 180 degree RF pulse is used to ________ the dephasing net vector in the transverse plane
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Magnetize
-
Decay
-
Delay
-
Refocus
Pregunta 58
Pregunta
The larger the net magnetic vector in the transverse plane the _______  the signal that is produced
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Smaller
-
Stronger
-
Weaker
-
None of the above
Pregunta 59
Pregunta
The smaller the net magnetic vector in the transverse plane the signal that is produced
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Larger
-
Stronger
-
Weaker
-
None of the above
Pregunta 60
Pregunta
The letters FID in an Fill signal stand for
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Field image dimensions
-
Free induction decay
-
Field induction direction
-
Free image direction
Pregunta 61
Pregunta
The type of signal that is created after a gradient is used to refocus the dephasing net vector is known as
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-
Spin echo signal
-
Gradient echo signal
-
Fill signal
-
None of the above
Pregunta 62
Pregunta
The time between two successive 90 degree RF pulses is known as
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-
Echo time
-
Repetition time
-
Inversion time
-
Relaxation time
Pregunta 63
Pregunta
The time between the 90 degree RF pulse and the spin echo signal in a spin echo pulse sequence is known as
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-
Echo time
-
Repetition time
-
Inversion time
-
Relaxation time
Pregunta 64
Pregunta
In an inversion recovery pulse sequence, the time between the 180 degree RF pulse and the 90 degree RF pulse is known as
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Echo time
-
Repetition time
-
Inversion time
-
Relaxation time
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