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? - 🧠ANSWER
✔✔hydrogen
nuclei that are available for MRI are those that exhibit a _________ -
🧠ANSWER ✔✔net spin
low energy = spin up = _______ - 🧠ANSWER ✔✔parallel
high energy = spin down = __________ - 🧠ANSWER ✔✔antiparallel
thermal equilibrium - 🧠ANSWER ✔✔when the body is in the magnetic field,
spins are aligned, and nothing else has happened
B0 - 🧠ANSWER ✔✔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 -
🧠ANSWER ✔✔greater
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,the reason why SNR increases at higher field strengths is because -
🧠ANSWER ✔✔the NMV also increases in size the stronger B0
1 hertz = - 🧠ANSWER ✔✔1 cycle per second
larmour equation - 🧠ANSWER ✔✔W0 = y x B0
what do the parts of the larmor equation mean? - 🧠ANSWER ✔✔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? - 🧠ANSWER
✔✔63.87 MHz
(42.58 MHz/T x 1.5T)
out of phase or incoherent - 🧠ANSWER ✔✔magnetic moments of
hydrogen are at different places on the precessional path at a moment in
time
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,in phase or coherent - 🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔1) coherent
2) transverse magnetization
phase refers to - 🧠ANSWER ✔✔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 -
🧠ANSWER ✔✔causes 1) transverse magnetization
and 2) phase precession
an RF excitation pulse causes - 🧠ANSWER ✔✔resonance
transverse magnetization occurs at __ degrees to B0 - 🧠ANSWER ✔✔90
saturation occurs when - 🧠ANSWER ✔✔spins are unable to absorb more
energy or to be stimulated and release more energy
what is a saturation pulse - 🧠ANSWER ✔✔180 degree RF
dephasing and relaxation happen at the same time but are - 🧠ANSWER
✔✔independent of eachother
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, relaxation - 🧠ANSWER ✔✔the process in which hydrogen lose energy
(occurs after RF excitation pulse is switched off)
dephasing is caused by - 🧠ANSWER ✔✔field inhomogeneities in the B0
field and interactions between spins and tissue
why is it called FID (free induction decay) - 🧠ANSWER ✔✔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 ______ - 🧠ANSWER ✔✔dephase and produce a FID
TR (repetition time) - 🧠ANSWER ✔✔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) - 🧠ANSWER ✔✔time from application of RF excitation
pulse to the peak of the signal induced in the receiver coil
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
4
PRIVACY STATEMENT. ALL RIGHTS RESERVED
COMPLETE EXAM QUESTIONS AND
VERIFIED ANSWERS| 100% ACCURATE
SOLUTIONS|ALREADY GRADED A+
what is the most abundant element in the human body? - 🧠ANSWER
✔✔hydrogen
nuclei that are available for MRI are those that exhibit a _________ -
🧠ANSWER ✔✔net spin
low energy = spin up = _______ - 🧠ANSWER ✔✔parallel
high energy = spin down = __________ - 🧠ANSWER ✔✔antiparallel
thermal equilibrium - 🧠ANSWER ✔✔when the body is in the magnetic field,
spins are aligned, and nothing else has happened
B0 - 🧠ANSWER ✔✔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 -
🧠ANSWER ✔✔greater
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,the reason why SNR increases at higher field strengths is because -
🧠ANSWER ✔✔the NMV also increases in size the stronger B0
1 hertz = - 🧠ANSWER ✔✔1 cycle per second
larmour equation - 🧠ANSWER ✔✔W0 = y x B0
what do the parts of the larmor equation mean? - 🧠ANSWER ✔✔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? - 🧠ANSWER
✔✔63.87 MHz
(42.58 MHz/T x 1.5T)
out of phase or incoherent - 🧠ANSWER ✔✔magnetic moments of
hydrogen are at different places on the precessional path at a moment in
time
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,in phase or coherent - 🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔1) coherent
2) transverse magnetization
phase refers to - 🧠ANSWER ✔✔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 -
🧠ANSWER ✔✔causes 1) transverse magnetization
and 2) phase precession
an RF excitation pulse causes - 🧠ANSWER ✔✔resonance
transverse magnetization occurs at __ degrees to B0 - 🧠ANSWER ✔✔90
saturation occurs when - 🧠ANSWER ✔✔spins are unable to absorb more
energy or to be stimulated and release more energy
what is a saturation pulse - 🧠ANSWER ✔✔180 degree RF
dephasing and relaxation happen at the same time but are - 🧠ANSWER
✔✔independent of eachother
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, relaxation - 🧠ANSWER ✔✔the process in which hydrogen lose energy
(occurs after RF excitation pulse is switched off)
dephasing is caused by - 🧠ANSWER ✔✔field inhomogeneities in the B0
field and interactions between spins and tissue
why is it called FID (free induction decay) - 🧠ANSWER ✔✔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 ______ - 🧠ANSWER ✔✔dephase and produce a FID
TR (repetition time) - 🧠ANSWER ✔✔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) - 🧠ANSWER ✔✔time from application of RF excitation
pulse to the peak of the signal induced in the receiver coil
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
4
PRIVACY STATEMENT. ALL RIGHTS RESERVED
