ARRT MRI REGISTRY EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS LATEST VERSION 2026-2027
(VERIFIED ANSWERS) ALREADY GRADED A+
An RF pulse of what flip angle will maximize the component of the net magnetization projected
into the transverse plane?
a. 180
b. 120
c. 90
d. 45 - ANSWERS-c.
T1 relaxation refers to ____ relaxation.
a. spin-spin
b. longitudinal
c. phase
d. transverse - ANSWERS-b.
Which of the following statements is false?
a. T1 relaxation refers to longitudinal recovery of magnetization while T2 relaxation refers to the
transverse decay of magnetization
b. T1 relaxation and T2 relaxation occur simultaneously
,c. echoes collected in the transverse plane demonstrate only T2 relaxation differences
d. T2 relaxation occurs much more quickly than T1 relaxation - ANSWERS-c.
If the precessional frequency of the patient's protons is approximately 21 MHz, what magnetic
field strength is being experienced by the patients protons? - ANSWERS-Larmor frequency
equation
W0= B0 x Y
21= 42.6 x (X)
21/42.6 = .4929 (round) = 0.5T
Which of the following is the definition of T1 relaxation?
a. the time is takes the net longitudinal magnetization of protons to grow 63% of its final
amplitude
b. the time at which is takes the transverse magnetization has decayed 63% of its full value -
ANSWERS-a.
Based on the graph of longitudinal relaxation shown above, which of the following would have
the brightest signal intensity on T1 image?
a. bone marrow
b. intervertebral disk
c. CSF
d. muscle
,(post test 1; page 1) - ANSWERS-a.
Based on the graph of longitudinal relaxation shown above, which of the following would have
the shortest T1 relaxation time?
a. bone marrow
b. intervertebral disk
c. CSF
d. muscle
(post test 1; page 1) - ANSWERS-a.
The edema associated with pathology in the brain has a much longer T2 relaxation time than
surrounding normal brain tissue. On a T2 image, what does this result in?
a. isointense between edema and surrounding normal brain tissue
b. a low signal intensity in the area of edema
c. a signal void in the area of edema
d. a high signal intensity in the area of edema - ANSWERS-d.
Which of the following dephasing mechanisms affects the size of the resulting spin echo?
a. magnetic field inhomogenities
b. phase effects of chemical shift
c. magnetic susceptibility
d. spin-spin interactions - ANSWERS-d.
, After a 90 RF pulse, if three 180 RF pulses are applied to generate three echoes, which of the
following is responsible for the third echo being much smaller than the first echo?
a. magnetic field inhomogenities
b. phase effects of chemical shift
c. magnetic susceptibility
d. spin-spin interactions - ANSWERS-d.
The MR echo is NOT:
a. detected as magnetic changes that induce voltage into an RF coil
b. collected when the magnetization in the transverse plane has been rephased
c. a tiny signal containing contrast info. necessary for tissue differentiation
d. collected only one time for a given image - ANSWERS-d.
What is the time from the initial RF excitation pulse to the echo called?
a. TE
b. TI
c. TM
d. TR - ANSWERS-a.
The proton's ____ contributes to its magnetic properties.
1. spinning motion
DETAILED ANSWERS LATEST VERSION 2026-2027
(VERIFIED ANSWERS) ALREADY GRADED A+
An RF pulse of what flip angle will maximize the component of the net magnetization projected
into the transverse plane?
a. 180
b. 120
c. 90
d. 45 - ANSWERS-c.
T1 relaxation refers to ____ relaxation.
a. spin-spin
b. longitudinal
c. phase
d. transverse - ANSWERS-b.
Which of the following statements is false?
a. T1 relaxation refers to longitudinal recovery of magnetization while T2 relaxation refers to the
transverse decay of magnetization
b. T1 relaxation and T2 relaxation occur simultaneously
,c. echoes collected in the transverse plane demonstrate only T2 relaxation differences
d. T2 relaxation occurs much more quickly than T1 relaxation - ANSWERS-c.
If the precessional frequency of the patient's protons is approximately 21 MHz, what magnetic
field strength is being experienced by the patients protons? - ANSWERS-Larmor frequency
equation
W0= B0 x Y
21= 42.6 x (X)
21/42.6 = .4929 (round) = 0.5T
Which of the following is the definition of T1 relaxation?
a. the time is takes the net longitudinal magnetization of protons to grow 63% of its final
amplitude
b. the time at which is takes the transverse magnetization has decayed 63% of its full value -
ANSWERS-a.
Based on the graph of longitudinal relaxation shown above, which of the following would have
the brightest signal intensity on T1 image?
a. bone marrow
b. intervertebral disk
c. CSF
d. muscle
,(post test 1; page 1) - ANSWERS-a.
Based on the graph of longitudinal relaxation shown above, which of the following would have
the shortest T1 relaxation time?
a. bone marrow
b. intervertebral disk
c. CSF
d. muscle
(post test 1; page 1) - ANSWERS-a.
The edema associated with pathology in the brain has a much longer T2 relaxation time than
surrounding normal brain tissue. On a T2 image, what does this result in?
a. isointense between edema and surrounding normal brain tissue
b. a low signal intensity in the area of edema
c. a signal void in the area of edema
d. a high signal intensity in the area of edema - ANSWERS-d.
Which of the following dephasing mechanisms affects the size of the resulting spin echo?
a. magnetic field inhomogenities
b. phase effects of chemical shift
c. magnetic susceptibility
d. spin-spin interactions - ANSWERS-d.
, After a 90 RF pulse, if three 180 RF pulses are applied to generate three echoes, which of the
following is responsible for the third echo being much smaller than the first echo?
a. magnetic field inhomogenities
b. phase effects of chemical shift
c. magnetic susceptibility
d. spin-spin interactions - ANSWERS-d.
The MR echo is NOT:
a. detected as magnetic changes that induce voltage into an RF coil
b. collected when the magnetization in the transverse plane has been rephased
c. a tiny signal containing contrast info. necessary for tissue differentiation
d. collected only one time for a given image - ANSWERS-d.
What is the time from the initial RF excitation pulse to the echo called?
a. TE
b. TI
c. TM
d. TR - ANSWERS-a.
The proton's ____ contributes to its magnetic properties.
1. spinning motion
