ARRT MRI EXAM REVIEW 2025 COMPLETE EXAM
QUESTIONS AND VERIFIED ANSWERS| 100% ACCURATE
SOLUTIONS|ALREADY GRADED A+
What is the most abundant element in the human body? - (ANSWERS)hydrogen #$%^&
Nuclei that are available for mri are those that exhibit a _________ - (ANSWERS)net spin
Low energy = spin up = _______ - (ANSWERS)parallel
High energy = spin down = __________ - (ANSWERS)antiparallel
Thermal equilibrium - (ANSWERS)when the body is in the magnetic field, spins are aligned,
and nothing else has happened
B0 - (ANSWERS)refers to large magnetic field of the mri scanner
At thermal equilibrium there are a ________ portion of spins with their magnetic moments
aligned in the same direction as b0 than against it - (ANSWERS)greater
The reason why snr increases at higher field strengths is because - (ANSWERS)the nmv also
increases in size the stronger b0
1 hertz = - (ANSWERS)1 cycle per second
Larmour equation - (ANSWERS)w0 = y x b0
What do the parts of the larmor equation mean? - (ANSWERS)w0 = larmour frequency
(precessional frequency)
Y = gyromagnetic ratio (42.58 mhz/t for hydrogen)
B0 = field strength
What is the precessional frequency for hydrogen at 1.5t? - (ANSWERS)63.87 mhz
(42.58 mhz/t x 1.5t)
Out of phase or incoherent - (ANSWERS)magnetic moments of hydrogen are at different
places on the precessional path at a moment in time
In phase or coherent - (ANSWERS)magnetic moments of hydrogen are at the same place on
the precessional path at a moment in time
What two things do you need to get signal? - (ANSWERS)1) coherent
2) transverse magnetization
, ARRT MRI EXAM REVIEW 2025 COMPLETE EXAM
QUESTIONS AND VERIFIED ANSWERS| 100% ACCURATE
SOLUTIONS|ALREADY GRADED A+
#$%^&
Phase refers to - (ANSWERS)the position of a magnetic moment of a spin on its precessional
path at any moment in time
B1 field is used to deliver an rf pulse which does what 2 things - (ANSWERS)causes 1)
transverse magnetization
And 2) phase precession
An rf excitation pulse causes - (ANSWERS)resonance
Transverse magnetization occurs at __ degrees to b0 - (ANSWERS)90
Saturation occurs when - (ANSWERS)spins are unable to absorb more energy or to be
stimulated and release more energy
What is a saturation pulse - (ANSWERS)180 degree rf
Dephasing and relaxation happen at the same time but are - (ANSWERS)independent of
eachother
Relaxation - (ANSWERS)the process in which hydrogen lose energy (occurs after rf
excitation pulse is switched off)
Dephasing is caused by - (ANSWERS)field inhomogeneities in the b0 field and interactions
between spins and tissue
Why is it called fid (free induction decay) - (ANSWERS)spins freely precess influenced only
by b0, signal decays with time, and magnetic moments of the spins induce a current in
receiver coil
When rf excitation pulse is removed, the mag moments of all spins ____ and ______ -
(ANSWERS)dephase and produce a fid
Tr (repetition time) - (ANSWERS)time from application of one rf excitation pulse to the
application of the next one
Determines how much longitudinal relaxation occurs (t1 weighting)
Te (echo time) - (ANSWERS)time from application of rf excitation pulse to the peak of the
signal induced in the receiver coil
, ARRT MRI EXAM REVIEW 2025 COMPLETE EXAM
QUESTIONS AND VERIFIED ANSWERS| 100% ACCURATE
SOLUTIONS|ALREADY GRADED A+
Determines how much decay of transverse magnetization occurs (t2 weighting) #$%^&
Tr controls - (ANSWERS)how much t1 relaxation occurs, recovery of longitudinal
magnetization
Te controls - (ANSWERS)how much t2 decay occurs, decaying signal of transverse
magnetization
Give examples of intrinsic contrast parameters (things that cannot be changed because
they are inherent to body's tissues) - (ANSWERS)- t1 recovery time
T2 decay time
Proton density
Flow
Apparent diffusion coefficient
Give examples of extrinsic contrast parameters (those that can be changed because they
are under our control) - (ANSWERS)- tr
Te
Flip angle
Ti
Turbo factor (etl)
B value
Describe the process of relaxation - (ANSWERS)- b1 field is turned off
Hydrogen nuclei return to their low-energy state
Magnetic moments dephase
Nmv returns to b0
Relaxation therefore results in the _______ longitudinal magnetization and the _____ of
transverse magnetization - (ANSWERS)recovery and decay
Which is faster decay or recovery? - (ANSWERS)decay
T1 recovery takes ______ longer than t2 decay - (ANSWERS)5-10 times longer
T1 relaxation is also known as - (ANSWERS)spin lattice energy transfer
T1 recovery - (ANSWERS)is the time it takes for 63% of longitudinal magnetization to recover
(intrinsic)
QUESTIONS AND VERIFIED ANSWERS| 100% ACCURATE
SOLUTIONS|ALREADY GRADED A+
What is the most abundant element in the human body? - (ANSWERS)hydrogen #$%^&
Nuclei that are available for mri are those that exhibit a _________ - (ANSWERS)net spin
Low energy = spin up = _______ - (ANSWERS)parallel
High energy = spin down = __________ - (ANSWERS)antiparallel
Thermal equilibrium - (ANSWERS)when the body is in the magnetic field, spins are aligned,
and nothing else has happened
B0 - (ANSWERS)refers to large magnetic field of the mri scanner
At thermal equilibrium there are a ________ portion of spins with their magnetic moments
aligned in the same direction as b0 than against it - (ANSWERS)greater
The reason why snr increases at higher field strengths is because - (ANSWERS)the nmv also
increases in size the stronger b0
1 hertz = - (ANSWERS)1 cycle per second
Larmour equation - (ANSWERS)w0 = y x b0
What do the parts of the larmor equation mean? - (ANSWERS)w0 = larmour frequency
(precessional frequency)
Y = gyromagnetic ratio (42.58 mhz/t for hydrogen)
B0 = field strength
What is the precessional frequency for hydrogen at 1.5t? - (ANSWERS)63.87 mhz
(42.58 mhz/t x 1.5t)
Out of phase or incoherent - (ANSWERS)magnetic moments of hydrogen are at different
places on the precessional path at a moment in time
In phase or coherent - (ANSWERS)magnetic moments of hydrogen are at the same place on
the precessional path at a moment in time
What two things do you need to get signal? - (ANSWERS)1) coherent
2) transverse magnetization
, ARRT MRI EXAM REVIEW 2025 COMPLETE EXAM
QUESTIONS AND VERIFIED ANSWERS| 100% ACCURATE
SOLUTIONS|ALREADY GRADED A+
#$%^&
Phase refers to - (ANSWERS)the position of a magnetic moment of a spin on its precessional
path at any moment in time
B1 field is used to deliver an rf pulse which does what 2 things - (ANSWERS)causes 1)
transverse magnetization
And 2) phase precession
An rf excitation pulse causes - (ANSWERS)resonance
Transverse magnetization occurs at __ degrees to b0 - (ANSWERS)90
Saturation occurs when - (ANSWERS)spins are unable to absorb more energy or to be
stimulated and release more energy
What is a saturation pulse - (ANSWERS)180 degree rf
Dephasing and relaxation happen at the same time but are - (ANSWERS)independent of
eachother
Relaxation - (ANSWERS)the process in which hydrogen lose energy (occurs after rf
excitation pulse is switched off)
Dephasing is caused by - (ANSWERS)field inhomogeneities in the b0 field and interactions
between spins and tissue
Why is it called fid (free induction decay) - (ANSWERS)spins freely precess influenced only
by b0, signal decays with time, and magnetic moments of the spins induce a current in
receiver coil
When rf excitation pulse is removed, the mag moments of all spins ____ and ______ -
(ANSWERS)dephase and produce a fid
Tr (repetition time) - (ANSWERS)time from application of one rf excitation pulse to the
application of the next one
Determines how much longitudinal relaxation occurs (t1 weighting)
Te (echo time) - (ANSWERS)time from application of rf excitation pulse to the peak of the
signal induced in the receiver coil
, ARRT MRI EXAM REVIEW 2025 COMPLETE EXAM
QUESTIONS AND VERIFIED ANSWERS| 100% ACCURATE
SOLUTIONS|ALREADY GRADED A+
Determines how much decay of transverse magnetization occurs (t2 weighting) #$%^&
Tr controls - (ANSWERS)how much t1 relaxation occurs, recovery of longitudinal
magnetization
Te controls - (ANSWERS)how much t2 decay occurs, decaying signal of transverse
magnetization
Give examples of intrinsic contrast parameters (things that cannot be changed because
they are inherent to body's tissues) - (ANSWERS)- t1 recovery time
T2 decay time
Proton density
Flow
Apparent diffusion coefficient
Give examples of extrinsic contrast parameters (those that can be changed because they
are under our control) - (ANSWERS)- tr
Te
Flip angle
Ti
Turbo factor (etl)
B value
Describe the process of relaxation - (ANSWERS)- b1 field is turned off
Hydrogen nuclei return to their low-energy state
Magnetic moments dephase
Nmv returns to b0
Relaxation therefore results in the _______ longitudinal magnetization and the _____ of
transverse magnetization - (ANSWERS)recovery and decay
Which is faster decay or recovery? - (ANSWERS)decay
T1 recovery takes ______ longer than t2 decay - (ANSWERS)5-10 times longer
T1 relaxation is also known as - (ANSWERS)spin lattice energy transfer
T1 recovery - (ANSWERS)is the time it takes for 63% of longitudinal magnetization to recover
(intrinsic)
