MRI Physics Final Exam 2024/2025 with 100% correct answers
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Course
MRI Physics F
Institution
MRI Physics F
As the B0 increases, SNR will correct answersIncrease
The scan time can be determined by correct answers1. NEX
2. Number of phase encoding
The precessional difference between hydrogen in fat and hydrogen in water in a 1.5 T magnet is correct answers224 Hz
A chemical shift phenomenon that ...
As the B0 increases, SNR will correct answersIncrease
The scan time can be determined by correct answers1. NEX
2. Number of phase encoding
The precessional difference between hydrogen in fat and hydrogen in water in a 1.5 T magnet is correct
answers224 Hz
A chemical shift phenomenon that is useful to void signal from fat is known as correct answersfat
saturation
What effect does increasing TE have on SNR? correct answersdecrease it
In a 1T magnet, fat and water will be "in phase" respectively at a TE of ____ msec. correct answers6.7
A broad receiver bandwidth will contain less noise than a narrow bandwidth. correct answersFalse
The precessional difference in ppm between hydrogen in fat and hydrogen in water is correct answers3.5
ppm
Which of the following pulse sequence does not use a 180 degree refocusing RF pulse? correct
answersgradient echo
Doubling the NEX will increase the SNR by what factor? correct answers1. 1.41
3. SQR Root of 2
Increasing the slice thickness from 5mm to 10 mm will decrease SNR correct answersfalse
, Increasing the TR will have what kind of affect on the image? correct answers1. 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%. correct answersFalse
Quadrature could provide a 41% increase in SNR over linear coils. correct answersTrue
Which of the following gradient oscillates between positive and negative amplitudes in EPI? correct
answersfrequency encoding gradient
Which of the following statements are true? correct answers2. 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? correct answersparallel imaging
Which of the following factors determine the size of the voxel? correct answersthe 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 correct answerstrue
What effect does decreasing the receiver bandwidth have on SNR? correct answersincrease it
The ratio of the amplitude of the signal received to the average amplitude of the noise is called ____
correct answersSNR ratio
The difference in SNR between two adjacent tissues known as ___ correct answersCNR
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