. ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED
MRI Physics Final Exam Questions With
Correct Answers 100% Verified
As the B0 increases, SNR will - Answer✔Increase
The scan time can be determined by - Answer✔1. NEX
2. Number of phase encoding
The precessional difference between hydrogen in fat and hydrogen in water in a 1.5 T magnet is -
Answer✔224 Hz
A chemical shift phenomenon that is useful to void signal from fat is known as - Answer✔fat
saturation
What effect does increasing TE have on SNR? - Answer✔decrease it
In a 1T magnet, fat and water will be "in phase" respectively at a TE of ____ msec. -
Answer✔6.7
A broad receiver bandwidth will contain less noise than a narrow bandwidth. - Answer✔False
The precessional difference in ppm between hydrogen in fat and hydrogen in water is -
Answer✔3.5 ppm
Which of the following pulse sequence does not use a 180 degree refocusing RF pulse? -
Answer✔gradient echo
Doubling the NEX will increase the SNR by what factor? - Answer✔1. 1.41
3. SQR Root of 2
Increasing the slice thickness from 5mm to 10 mm will decrease SNR - Answer✔false
Increasing the TR will have what kind of affect on the image? - Answer✔1. decrease T1-
weighting contrast
3. Increase SNR
If NEX is doubled, scan time will be cut in half and the SNR will decrease by 41%. -
Answer✔False
Quadrature could provide a 41% increase in SNR over linear coils. - Answer✔True
1|Page
, . ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED
Which of the following gradient oscillates between positive and negative amplitudes in EPI? -
Answer✔frequency encoding gradient
Which of the following statements are true? - Answer✔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? - Answer✔parallel
imaging
Which of the following factors determine the size of the voxel? - Answer✔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 - Answer✔true
What effect does decreasing the receiver bandwidth have on SNR? - Answer✔increase it
The ratio of the amplitude of the signal received to the average amplitude of the noise is called
____ - Answer✔SNR ratio
The difference in SNR between two adjacent tissues known as ___ - Answer✔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. - Answer✔True
Which of the following sequence does not use inversion recovery technique? - Answer✔1.
ABSIR
In a 2D imaging slice acquisition, scan time is given by which of the following equation? -
Answer✔TR x number of phase steps x NEX
Changing the number of phase encoding steps will directly affect which of the following? -
Answer✔scan time
Due to its high susceptibility to paramagnetic substances, which of the following sequence is
particularly useful to image hemorrhage? - Answer✔gradient echo
Gradient echo sequences produce a better SNR than spin echo sequences. - Answer✔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? - Answer✔Dixon
In an IR pulse sequence, the time between initializing the 180 pulse and the 90 pulse is known as
- Answer✔TI
void signal from fat - Answer✔STIR
recovery of longitudinal relaxation - Answer✔T1 relaxation
2|Page
MRI Physics Final Exam Questions With
Correct Answers 100% Verified
As the B0 increases, SNR will - Answer✔Increase
The scan time can be determined by - Answer✔1. NEX
2. Number of phase encoding
The precessional difference between hydrogen in fat and hydrogen in water in a 1.5 T magnet is -
Answer✔224 Hz
A chemical shift phenomenon that is useful to void signal from fat is known as - Answer✔fat
saturation
What effect does increasing TE have on SNR? - Answer✔decrease it
In a 1T magnet, fat and water will be "in phase" respectively at a TE of ____ msec. -
Answer✔6.7
A broad receiver bandwidth will contain less noise than a narrow bandwidth. - Answer✔False
The precessional difference in ppm between hydrogen in fat and hydrogen in water is -
Answer✔3.5 ppm
Which of the following pulse sequence does not use a 180 degree refocusing RF pulse? -
Answer✔gradient echo
Doubling the NEX will increase the SNR by what factor? - Answer✔1. 1.41
3. SQR Root of 2
Increasing the slice thickness from 5mm to 10 mm will decrease SNR - Answer✔false
Increasing the TR will have what kind of affect on the image? - Answer✔1. decrease T1-
weighting contrast
3. Increase SNR
If NEX is doubled, scan time will be cut in half and the SNR will decrease by 41%. -
Answer✔False
Quadrature could provide a 41% increase in SNR over linear coils. - Answer✔True
1|Page
, . ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED
Which of the following gradient oscillates between positive and negative amplitudes in EPI? -
Answer✔frequency encoding gradient
Which of the following statements are true? - Answer✔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? - Answer✔parallel
imaging
Which of the following factors determine the size of the voxel? - Answer✔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 - Answer✔true
What effect does decreasing the receiver bandwidth have on SNR? - Answer✔increase it
The ratio of the amplitude of the signal received to the average amplitude of the noise is called
____ - Answer✔SNR ratio
The difference in SNR between two adjacent tissues known as ___ - Answer✔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. - Answer✔True
Which of the following sequence does not use inversion recovery technique? - Answer✔1.
ABSIR
In a 2D imaging slice acquisition, scan time is given by which of the following equation? -
Answer✔TR x number of phase steps x NEX
Changing the number of phase encoding steps will directly affect which of the following? -
Answer✔scan time
Due to its high susceptibility to paramagnetic substances, which of the following sequence is
particularly useful to image hemorrhage? - Answer✔gradient echo
Gradient echo sequences produce a better SNR than spin echo sequences. - Answer✔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? - Answer✔Dixon
In an IR pulse sequence, the time between initializing the 180 pulse and the 90 pulse is known as
- Answer✔TI
void signal from fat - Answer✔STIR
recovery of longitudinal relaxation - Answer✔T1 relaxation
2|Page
