ARRT MRI REGISTRY EXAM
Complete Questions and Correct Answers
(2024/2025) FINAL EXAM
Already Graded
Which of the following parameter adjustments will LENGTHEN scan time in an
MR pulse sequence?
I. Decrease TR
II. Increase TR
III. Increase ETL
IV. Decrease ETL
V. Decrease NEX
VI. Increase NEX
VII. Enable Half-fourier
VIII. Increase parallel imaging factor
IX. Decrease parallel imaging factor
X. Enable anti-aliasing - ANSWER ✔ II, IV, VI and IX
Which of the following parameter adjustments help to improve SNR in an MR
image?
I. Increase TR
II.Reduce Phase Matrix
III. Reduce Pixel Size
IV. Increase FOV
V. Reduce rBW
VI. Increase rBW
VII. Increase NSA
VIII. Decrease NSA
IX. Increase ETL
X. Decrease ETL - ANSWER ✔ I, II, IV, V, VII and X
In a fast spin echo sequence with a 25 cm FOV, 224 x 320 matrix, TR 2500, 100
TE, 3mm slice thickness, 12 ETL and 4 NEX, the scan time would be:
A. 2 minutes 6 seconds
B. 3 minutes 7 seconds
C. 3 minutes 11 seconds
D. 4 minutes 27 seconds
,E. 4 minutes 44 seconds - ANSWER ✔ 3 minutes 7 seconds
The phase encoding step is performed:
A. During frequency encoding
B. In place of frequency encoding
C. Prior to frequency encoding
D. Following frequency encoding - ANSWER ✔ Prior to frequency encoding
Permanent magnets with a vertical magnetic field use surface coils that are:
A. Phased array
B. Linear
C. Quadrature
D. Solenoids - ANSWER ✔ Solenoids
Gradient echo sequences can yield either T1 or T2* characteristics, with
influences caused by all of the following EXCEPT:
A. Chemical shift
B. Inhomogeneity
C. Susceptibility
D. Inversion time - ANSWER ✔ Inversion time
In what orientation would a tear of the collateral ligaments of the knee be best
visualized?
A. Sagittal
B. Axial
C. Transverse
D. Coronal
E. None of the above - ANSWER ✔ Coronal
RF energy used in MRI is classified as:
A. Low energy, nonionizing radiation
B. Low energy, ionizing radiation
C. High energy, nonionizing radiation
D. High energy, ionizing radiation - ANSWER ✔ Low energy, nonionizing
radiation
On T1 weighted images of the spine, the CSF (cerebrospinal fluid) appears:
A. Isointense to the spinal cord
B. Hypointense to the spinal cord
,C. Hyperintense to the spinal cord
D. None of the above - ANSWER ✔ Hypointense to the spinal cord
Single order gradient moment nulling does not compensate for:
A. Constant velocity flow
B. Accelerated flow
C. Reverse flow
D. B and C - ANSWER ✔ B and C
The gradient rise time is defined as the:
A. Time it takes longitudinal magnetization to regrow
B. Time between TI and initial RF pulse
C. Speed rate of ascent or descent of a gradient from zero to its maximum
amplitude
D. Time it takes for the gradient to reach its full amplitude - ANSWER ✔ Time it
takes for the gradient to reach its full amplitude
In an MRA sequence, the removal of signal from vessels is accomplished by:
A. Spectral presaturation
B. Spatial presaturation
C. Gradient moment nulling
D. B and C
E. None of the above - ANSWER ✔ Spatial presaturation
CSF suppression is performed with which type of technique?
A. FLAIR
B. STIR
C. SPGR
D. FISP - ANSWER ✔ FLAIR
Magnetic field inhomogeneity is expressed in:
A. Watts per kilogram
B. Gauss per centimeter
C. Parts per million
D. Tesla per meter - ANSWER ✔ Parts per million
During dynamic enhanced imaging for vasculature or visceral structures, contrast
is administered and k-space is filled with __________ to ensure that the contrast
enhancement is well visualized.
, A. Centric
B. Linear
C. Reverse centric
D. Reverse linear - ANSWER ✔ Centric
To produce a high quality reformatted image, the:
A. Acquisition voxel should be anisotropic
B. Acquisition voxel should be isotropic
C. NEX >4 should be utilized
D. Acquisition voxel should be rectangular - ANSWER ✔ Acquisition voxel
should be isotropic
When imaging a hemorrhagic infarct in the brain, which pulse sequence would
demonstrate the magnetic susceptibility effects better?
A. Spin echo
B. Fast spin echo
C. Inversion recovery
D. Gradient echo
E. Multi echo spin echo
F. FLAIR - ANSWER ✔ Gradient echo
Due to the lack of 180° RF refocusing pulse, the gradient echo sequence is more
susceptible to magnetic field inhomogeneities, such as hemosiderin from blood
products. The hemosiderin is highly magnetic because it is principally iron.
Which of the following sequences is the most insensitive to magnetic field
inhomogeneity?
A. RF spoiled gradient echo
B. Spin echo
C. Steady state rephased gradient echo
D. Echo planar - ANSWER ✔ Spin echo
The MRI system component that provides the ability to perform spatial encoding
is the:
A. Shim system
B. Main magnet
C. Gradient system
D. Radiofrequency system - ANSWER ✔ Gradient system
Complete Questions and Correct Answers
(2024/2025) FINAL EXAM
Already Graded
Which of the following parameter adjustments will LENGTHEN scan time in an
MR pulse sequence?
I. Decrease TR
II. Increase TR
III. Increase ETL
IV. Decrease ETL
V. Decrease NEX
VI. Increase NEX
VII. Enable Half-fourier
VIII. Increase parallel imaging factor
IX. Decrease parallel imaging factor
X. Enable anti-aliasing - ANSWER ✔ II, IV, VI and IX
Which of the following parameter adjustments help to improve SNR in an MR
image?
I. Increase TR
II.Reduce Phase Matrix
III. Reduce Pixel Size
IV. Increase FOV
V. Reduce rBW
VI. Increase rBW
VII. Increase NSA
VIII. Decrease NSA
IX. Increase ETL
X. Decrease ETL - ANSWER ✔ I, II, IV, V, VII and X
In a fast spin echo sequence with a 25 cm FOV, 224 x 320 matrix, TR 2500, 100
TE, 3mm slice thickness, 12 ETL and 4 NEX, the scan time would be:
A. 2 minutes 6 seconds
B. 3 minutes 7 seconds
C. 3 minutes 11 seconds
D. 4 minutes 27 seconds
,E. 4 minutes 44 seconds - ANSWER ✔ 3 minutes 7 seconds
The phase encoding step is performed:
A. During frequency encoding
B. In place of frequency encoding
C. Prior to frequency encoding
D. Following frequency encoding - ANSWER ✔ Prior to frequency encoding
Permanent magnets with a vertical magnetic field use surface coils that are:
A. Phased array
B. Linear
C. Quadrature
D. Solenoids - ANSWER ✔ Solenoids
Gradient echo sequences can yield either T1 or T2* characteristics, with
influences caused by all of the following EXCEPT:
A. Chemical shift
B. Inhomogeneity
C. Susceptibility
D. Inversion time - ANSWER ✔ Inversion time
In what orientation would a tear of the collateral ligaments of the knee be best
visualized?
A. Sagittal
B. Axial
C. Transverse
D. Coronal
E. None of the above - ANSWER ✔ Coronal
RF energy used in MRI is classified as:
A. Low energy, nonionizing radiation
B. Low energy, ionizing radiation
C. High energy, nonionizing radiation
D. High energy, ionizing radiation - ANSWER ✔ Low energy, nonionizing
radiation
On T1 weighted images of the spine, the CSF (cerebrospinal fluid) appears:
A. Isointense to the spinal cord
B. Hypointense to the spinal cord
,C. Hyperintense to the spinal cord
D. None of the above - ANSWER ✔ Hypointense to the spinal cord
Single order gradient moment nulling does not compensate for:
A. Constant velocity flow
B. Accelerated flow
C. Reverse flow
D. B and C - ANSWER ✔ B and C
The gradient rise time is defined as the:
A. Time it takes longitudinal magnetization to regrow
B. Time between TI and initial RF pulse
C. Speed rate of ascent or descent of a gradient from zero to its maximum
amplitude
D. Time it takes for the gradient to reach its full amplitude - ANSWER ✔ Time it
takes for the gradient to reach its full amplitude
In an MRA sequence, the removal of signal from vessels is accomplished by:
A. Spectral presaturation
B. Spatial presaturation
C. Gradient moment nulling
D. B and C
E. None of the above - ANSWER ✔ Spatial presaturation
CSF suppression is performed with which type of technique?
A. FLAIR
B. STIR
C. SPGR
D. FISP - ANSWER ✔ FLAIR
Magnetic field inhomogeneity is expressed in:
A. Watts per kilogram
B. Gauss per centimeter
C. Parts per million
D. Tesla per meter - ANSWER ✔ Parts per million
During dynamic enhanced imaging for vasculature or visceral structures, contrast
is administered and k-space is filled with __________ to ensure that the contrast
enhancement is well visualized.
, A. Centric
B. Linear
C. Reverse centric
D. Reverse linear - ANSWER ✔ Centric
To produce a high quality reformatted image, the:
A. Acquisition voxel should be anisotropic
B. Acquisition voxel should be isotropic
C. NEX >4 should be utilized
D. Acquisition voxel should be rectangular - ANSWER ✔ Acquisition voxel
should be isotropic
When imaging a hemorrhagic infarct in the brain, which pulse sequence would
demonstrate the magnetic susceptibility effects better?
A. Spin echo
B. Fast spin echo
C. Inversion recovery
D. Gradient echo
E. Multi echo spin echo
F. FLAIR - ANSWER ✔ Gradient echo
Due to the lack of 180° RF refocusing pulse, the gradient echo sequence is more
susceptible to magnetic field inhomogeneities, such as hemosiderin from blood
products. The hemosiderin is highly magnetic because it is principally iron.
Which of the following sequences is the most insensitive to magnetic field
inhomogeneity?
A. RF spoiled gradient echo
B. Spin echo
C. Steady state rephased gradient echo
D. Echo planar - ANSWER ✔ Spin echo
The MRI system component that provides the ability to perform spatial encoding
is the:
A. Shim system
B. Main magnet
C. Gradient system
D. Radiofrequency system - ANSWER ✔ Gradient system
