ARRT MRI exam review 2026 COMPLETE EXAM
QUESTIONS AND VERIFIED ANSWERS| 100%
ACCURATE SOLUTIONS|ALREADY GRADED A+
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Terms in this set (325)
what is the most abundant element hydrogen
in the human body?
nuclei that are available for MRI are net spin
those that exhibit a _________
low energy = spin up = _______ parallel
high energy = spin down = __________ antiparallel
thermal equilibrium when the body is in the magnetic field, spins are
aligned, and nothing else has happened
B0 refers to large magnetic field of the MRI scanner
at thermal equilibrium there are a greater
________ portion of spins with their
magnetic moments aligned in the
same direction as B0 than against it
the reason why SNR increases at the NMV also increases in size the stronger B0
higher field strengths is because
, 1 hertz = 1 cycle per second
larmour equation W0 = y x B0
what do the parts of the larmor W0 = Larmour frequency (precessional
equation mean? frequency)
y = gyromagnetic ratio (42.58 MHz/T for
hydrogen)
B0 = Field strength
what is the precessional frequency 63.87 MHz
for hydrogen at 1.5T? (42.58 MHz/T x 1.5T)
out of phase or incoherent magnetic moments of hydrogen are at different
places on the precessional path at a moment in
time
in phase or coherent 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 1) coherent
signal? 2) transverse magnetization
phase refers to 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 causes 1) transverse magnetization
pulse which does what 2 things and 2) phase precession
an RF excitation pulse causes resonance
QUESTIONS AND VERIFIED ANSWERS| 100%
ACCURATE SOLUTIONS|ALREADY GRADED A+
Save
Terms in this set (325)
what is the most abundant element hydrogen
in the human body?
nuclei that are available for MRI are net spin
those that exhibit a _________
low energy = spin up = _______ parallel
high energy = spin down = __________ antiparallel
thermal equilibrium when the body is in the magnetic field, spins are
aligned, and nothing else has happened
B0 refers to large magnetic field of the MRI scanner
at thermal equilibrium there are a greater
________ portion of spins with their
magnetic moments aligned in the
same direction as B0 than against it
the reason why SNR increases at the NMV also increases in size the stronger B0
higher field strengths is because
, 1 hertz = 1 cycle per second
larmour equation W0 = y x B0
what do the parts of the larmor W0 = Larmour frequency (precessional
equation mean? frequency)
y = gyromagnetic ratio (42.58 MHz/T for
hydrogen)
B0 = Field strength
what is the precessional frequency 63.87 MHz
for hydrogen at 1.5T? (42.58 MHz/T x 1.5T)
out of phase or incoherent magnetic moments of hydrogen are at different
places on the precessional path at a moment in
time
in phase or coherent 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 1) coherent
signal? 2) transverse magnetization
phase refers to 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 causes 1) transverse magnetization
pulse which does what 2 things and 2) phase precession
an RF excitation pulse causes resonance
