MRI Physics Final Exam Study
QUESTIONS/ANSWERS (VERIFIED AND WELL
DETAILED ANSWERS) LATEST UPDATE 2024/2025
Which of the following gradient oscillates between positive and negative amplitudes in
EPI? - ✔✔frequency encoding gradient
Which of the following statements are true? - ✔✔2. Noise depends on the build of
the patient and the area under examination and the inherent noise of the system.
3. Noise occurs at all frequencies and is random in time
What type of imaging uses the acronyms SENSE, GRAPPA, and iPAT? - ✔✔parallel
imaging
Which of the following factors determine the size of the voxel? - ✔✔the slice
thickness and the number of pixels
Echo planar imaging uses various schemes to fill the entire k-space or at least a large
portion of space in a single TR - ✔✔true
What effect does decreasing the receiver bandwidth have on SNR? - ✔✔increase it
The ratio of the amplitude of the signal received to the average amplitude of the noise is
called ____ - ✔✔SNR ratio
The difference in SNR between two adjacent tissues known as ___ - ✔✔CNR
,SNR is a type of sequence that begins with a 180 RF inversion pulse that is applied at the
specific precessional frequency of hydrogen in fat. - ✔✔True
Which of the following sequence does not use inversion recovery technique? - ✔✔1.
ABSIR
In a 2D imaging slice acquisition, scan time is given by which of the following equation? -
✔✔TR x number of phase steps x NEX
Changing the number of phase encoding steps will directly affect which of the
following? - ✔✔scan time
Due to its high susceptibility to paramagnetic substances, which of the following
sequence is particularly useful to image hemorrhage? - ✔✔gradient echo
Gradient echo sequences produce a better SNR than spin echo sequences. - ✔✔False
Which of the following type of sequence can deliver up to four contrasts in one
measurement in-phase, out-of-phase, water and fat images? - ✔✔Dixon
In an IR pulse sequence, the time between initializing the 180 pulse and the 90 pulse is
known as - ✔✔TI
void signal from fat - ✔✔STIR
recovery of longitudinal relaxation - ✔✔T1 relaxation
, affected by magnetic field inhomogeneities - ✔✔T2* decay
void signal from fluid - ✔✔FLAIR
loss of transverse magnetization - ✔✔T2 relaxation
In GRE, the spine are mainly rephrased by the ___ to produce the signal (echo) -
✔✔FEG
Echo train length is a parameter used in which of the following pulse sequence? -
✔✔fast spin echo
What mechanism rephrases the rephrasing hydrogen nuclei in a spin echo sequence? -
✔✔180 RF pulse
which of the following factor will increase spatial resolution? - ✔✔reducing slice
thickness
Which of the following statements is true about parallel imaging? - ✔✔reduce breath
hold-duration
Which of the following type of MRA uses a bipolar gradient to enhance vascular
structures? - ✔✔Phase contrast (PC) MRA
Which of the following will improve signal in entry slice phenomenon? - ✔✔Long TR
QUESTIONS/ANSWERS (VERIFIED AND WELL
DETAILED ANSWERS) LATEST UPDATE 2024/2025
Which of the following gradient oscillates between positive and negative amplitudes in
EPI? - ✔✔frequency encoding gradient
Which of the following statements are true? - ✔✔2. Noise depends on the build of
the patient and the area under examination and the inherent noise of the system.
3. Noise occurs at all frequencies and is random in time
What type of imaging uses the acronyms SENSE, GRAPPA, and iPAT? - ✔✔parallel
imaging
Which of the following factors determine the size of the voxel? - ✔✔the slice
thickness and the number of pixels
Echo planar imaging uses various schemes to fill the entire k-space or at least a large
portion of space in a single TR - ✔✔true
What effect does decreasing the receiver bandwidth have on SNR? - ✔✔increase it
The ratio of the amplitude of the signal received to the average amplitude of the noise is
called ____ - ✔✔SNR ratio
The difference in SNR between two adjacent tissues known as ___ - ✔✔CNR
,SNR is a type of sequence that begins with a 180 RF inversion pulse that is applied at the
specific precessional frequency of hydrogen in fat. - ✔✔True
Which of the following sequence does not use inversion recovery technique? - ✔✔1.
ABSIR
In a 2D imaging slice acquisition, scan time is given by which of the following equation? -
✔✔TR x number of phase steps x NEX
Changing the number of phase encoding steps will directly affect which of the
following? - ✔✔scan time
Due to its high susceptibility to paramagnetic substances, which of the following
sequence is particularly useful to image hemorrhage? - ✔✔gradient echo
Gradient echo sequences produce a better SNR than spin echo sequences. - ✔✔False
Which of the following type of sequence can deliver up to four contrasts in one
measurement in-phase, out-of-phase, water and fat images? - ✔✔Dixon
In an IR pulse sequence, the time between initializing the 180 pulse and the 90 pulse is
known as - ✔✔TI
void signal from fat - ✔✔STIR
recovery of longitudinal relaxation - ✔✔T1 relaxation
, affected by magnetic field inhomogeneities - ✔✔T2* decay
void signal from fluid - ✔✔FLAIR
loss of transverse magnetization - ✔✔T2 relaxation
In GRE, the spine are mainly rephrased by the ___ to produce the signal (echo) -
✔✔FEG
Echo train length is a parameter used in which of the following pulse sequence? -
✔✔fast spin echo
What mechanism rephrases the rephrasing hydrogen nuclei in a spin echo sequence? -
✔✔180 RF pulse
which of the following factor will increase spatial resolution? - ✔✔reducing slice
thickness
Which of the following statements is true about parallel imaging? - ✔✔reduce breath
hold-duration
Which of the following type of MRA uses a bipolar gradient to enhance vascular
structures? - ✔✔Phase contrast (PC) MRA
Which of the following will improve signal in entry slice phenomenon? - ✔✔Long TR
