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