ARRT MRI LATEST UPDATED
2025/2026 EXAM REVIEW
COMPLETE EXAM WITH
QUESTIONS AND SURE VERIFIED
SOLUTIONS 100% (MOST
FREQUENTLY TESTED) GRADED AT
A+ SCORE !! SURE GUARANTEED
PASS!!
1. what is the most abundant element in the human body? -
ANSWER ✔ hydrogen
2. out of phase or incoherent - ANSWER ✔ magnetic moments of
hydrogen are at different places on the precessional path at a
moment in time
3. in phase or coherent - ANSWER ✔ magnetic moments of
hydrogen are at the same place on the precessional path at a
moment in time
,4. what two things do you need to get signal? - ANSWER ✔ 1)
coherent
2) transverse magnetization
5. phase refers to - ANSWER ✔ the position of a magnetic moment
of a spin on its precessional path at any moment in time
6. B1 field is used to deliver an RF pulse which does what 2 things -
ANSWER ✔ causes 1) transverse magnetization
and 2) phase precession
7. an RF excitation pulse causes - ANSWER ✔ resonance
8. nuclei that are available for MRI are those that exhibit a
_________ - ANSWER ✔ net spin
9. low energy = spin up = _______ - ANSWER ✔ parallel
10. high energy = spin down = __________ - ANSWER ✔
antiparallel
11. thermal equilibrium - ANSWER ✔ when the body is in the
magnetic field, spins are aligned, and nothing else has happened
,12. B0 - ANSWER ✔ refers to large magnetic field of the MRI
scanner
13. 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
14. the reason why SNR increases at higher field strengths is
because - ANSWER ✔ the NMV also increases in size the stronger
B0
15. 1 hertz = - ANSWER ✔ 1 cycle per second
16. larmour equation - ANSWER ✔ W0 = y x B0
17. 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
18. what is the precessional frequency for hydrogen at 1.5T? -
ANSWER ✔ 63.87 MHz
(42.58 MHz/T x 1.5T)
, 19. transverse magnetization occurs at __ degrees to B0 -
ANSWER ✔ 90
20. saturation occurs when - ANSWER ✔ spins are unable to
absorb more energy or to be stimulated and release more energy
21. what is a saturation pulse - ANSWER ✔ 180 degree RF
22. dephasing and relaxation happen at the same time but are -
ANSWER ✔ independent of eachother
23. relaxation - ANSWER ✔ the process in which hydrogen lose
energy (occurs after RF excitation pulse is switched off)
24. dephasing is caused by - ANSWER ✔ field inhomogeneities
in the B0 field and interactions between spins and tissue
25. 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
2025/2026 EXAM REVIEW
COMPLETE EXAM WITH
QUESTIONS AND SURE VERIFIED
SOLUTIONS 100% (MOST
FREQUENTLY TESTED) GRADED AT
A+ SCORE !! SURE GUARANTEED
PASS!!
1. what is the most abundant element in the human body? -
ANSWER ✔ hydrogen
2. out of phase or incoherent - ANSWER ✔ magnetic moments of
hydrogen are at different places on the precessional path at a
moment in time
3. in phase or coherent - ANSWER ✔ magnetic moments of
hydrogen are at the same place on the precessional path at a
moment in time
,4. what two things do you need to get signal? - ANSWER ✔ 1)
coherent
2) transverse magnetization
5. phase refers to - ANSWER ✔ the position of a magnetic moment
of a spin on its precessional path at any moment in time
6. B1 field is used to deliver an RF pulse which does what 2 things -
ANSWER ✔ causes 1) transverse magnetization
and 2) phase precession
7. an RF excitation pulse causes - ANSWER ✔ resonance
8. nuclei that are available for MRI are those that exhibit a
_________ - ANSWER ✔ net spin
9. low energy = spin up = _______ - ANSWER ✔ parallel
10. high energy = spin down = __________ - ANSWER ✔
antiparallel
11. thermal equilibrium - ANSWER ✔ when the body is in the
magnetic field, spins are aligned, and nothing else has happened
,12. B0 - ANSWER ✔ refers to large magnetic field of the MRI
scanner
13. 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
14. the reason why SNR increases at higher field strengths is
because - ANSWER ✔ the NMV also increases in size the stronger
B0
15. 1 hertz = - ANSWER ✔ 1 cycle per second
16. larmour equation - ANSWER ✔ W0 = y x B0
17. 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
18. what is the precessional frequency for hydrogen at 1.5T? -
ANSWER ✔ 63.87 MHz
(42.58 MHz/T x 1.5T)
, 19. transverse magnetization occurs at __ degrees to B0 -
ANSWER ✔ 90
20. saturation occurs when - ANSWER ✔ spins are unable to
absorb more energy or to be stimulated and release more energy
21. what is a saturation pulse - ANSWER ✔ 180 degree RF
22. dephasing and relaxation happen at the same time but are -
ANSWER ✔ independent of eachother
23. relaxation - ANSWER ✔ the process in which hydrogen lose
energy (occurs after RF excitation pulse is switched off)
24. dephasing is caused by - ANSWER ✔ field inhomogeneities
in the B0 field and interactions between spins and tissue
25. 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
