ARMRIT COMPREHENSIVE EXAM UPDATED QUESTIONS AND SOLUTIONS GRADED A+

ARMRIT COMPREHENSIVE EXAM UPDATED QUESTIONS
AND SOLUTIONS GRADED A+
✔✔which of the following setting descriptions for the parameters TR and TE best
describes a proton density image?
A) short TR/ short TE
B) long TR/ long TE
C) short TR/ long TE
D) long TR/ short TE
E) long TR/ short TI - ✔✔long TR/short TE

✔✔the inversion time, in an inversion recovery pulse sequence, is the time interval
between the:
A) 90 and 180 pulses
B) 90 degree pulse and the echo signal
C) 180 degree pulse and the echo signal
D) 90 and 90 degree pulses
E) 180 and 90 degree pulses - ✔✔180 and 90 degree pulses

✔✔in general, parameter settings of TR and TE for attaining T1 and T2 images are as
follows:
A) T1; TR 1600-3000ms, TE 70-100ms / T2; TR 100-100ms, TE 20-30ms
B) T1; TR 100-1000ms, TE 70-100ms / T2; TR 1600-3000ms, TE 20-30ms
C) T1; TR 100-1000ms, TE 20-30ms / T2; TR 1600-3000ms, TE 70-100ms
D) T1; TR 1600-3000ms, TE 20-30ms / T2; TR 100-1000ms, TE 70-100ms - ✔✔T1; TR
100-1000ms, TE 20-30ms / T2; TR 1600-3000ms, TE 70-100ms

✔✔the pulse sequence that replaces the second RF pulse with a magnetic field gradient
to rephase the transverse vector and produce the echo signal is:
A) spin echo
B) gradient echo
C) spin spin
D) inversion recovery
E) saturation recovery - ✔✔Gradient echo

✔✔The artifact known as crosstalk can be corrected for by adjusting which parameter
A) FOV
B) TR
C) slice thickness
D) slice interval
E) NEX - ✔✔slice interval

✔✔in terms of time, the least expensive parameter to increase, of those that affect time,
when attempting to improve image quality is:
A) Matrix

,B) TR
C) NEX
D) # of slices
E) none - ✔✔TR

✔✔by increasing the parameter, matrix, the size of the pixel will:
A) decrease
B) increase
C) stay the same
D) vary - ✔✔decrease

✔✔increasing which parameter is considered the best technique for improving image
quality
A) Matrix
B) TR
C) NEX
D) # of slices
E) none - ✔✔NEX

✔✔of the following techniques, which one is applied to prevent crosstalk between multi-
slices with little to no interslice gap?
A) pre-saturation
B) off-center FOV
C) flow enhancement
D) interleaving
E) even echo rephasing - ✔✔interleaving

✔✔residual magnetic gradients that persist for a variable time duration after the pulse of
electricity from the gradient power supply is terminated are known as:
A) chemical shift
B) inhomogeneities
C) eddy currents
D) magnetic susceptibilities
E) T2* - ✔✔eddy currents

✔✔the slice selection gradient exposes the patients body to a series of increasing or
decreasing magnetic fields to select a slice. in what relation to the slice is this gradient
introduced
A) antiparallel
B) parallel
C) oblique
D) perpendicular
E) none - ✔✔perpendicular

, ✔✔which method of providing spatial localization is employed during a pulse sequence
when selecting only one slice at a time?
A) FID
B) FT
C) FFT
D) 2DFT
E) 3DFT - ✔✔2DFT

✔✔which method of providing spatial localization is employed during a pulse sequence
when selecting a volume of slices?
A) FID
B) FT
C) FFT
D) 2DFT
E) 3DFT - ✔✔3DFT

✔✔for MRI magnets, the specification for field homogeneity that is considered
acceptable is:
A) 5-10ppm
B) 10-15ppm
C) 20-30ppm
D) 40-50ppm - ✔✔20-30ppm

✔✔the primary factor of an inversion recovery pulse sequence is which of the following
parameters?
A) TR
B) TE
C) TI
D) FSE
E) MRA - ✔✔TI

✔✔of the different types of coils used in MRI, which type(s) are found only in the
housing of the main magnet?
A) surface coils
B) radio frequency coils
C) Heimholtz coils
D) shim/gradient coils
E) all - ✔✔shim/gradient coils

✔✔which of the following causes of artifacts on MR images is most commonly mistaken
for a pathological signal?
A) eddy currents
B) magnetic susceptibility
C) chemical shift
D) untuned RF coils