Physics Basic Test: MCQ Quiz!
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Questions and Answers
- 1.
Each manufacturer uses different acronyms to distinguish between individual pulse sequences. A fast spin-echo on a Siemens scanner is called:
- A.
IR
- B.
FLAIR
- C.
STIR
- D.
TSE
Correct Answer
D. TSEExplanation
The question states that each manufacturer uses different acronyms to distinguish between pulse sequences. It specifically mentions a Siemens scanner, and asks for the acronym used for a fast spin-echo sequence on this scanner. Among the given options, TSE is the only one that matches the description of a fast spin-echo sequence. Therefore, TSE is the correct answer.Rate this question:
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- 2.
If you increased the ETL, you would increase the number of slices per TR.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Increasing the ETL (Echo Train Length) in MRI imaging does not directly increase the number of slices per TR (Repetition Time). The number of slices per TR is determined by the slice thickness and the TR itself. The ETL refers to the number of echoes acquired during each TR and is related to the image contrast and signal-to-noise ratio. Increasing the ETL may improve image quality but it does not affect the number of slices acquired per TR. Therefore, the statement is false.Rate this question:
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- 3.
A series of excitation pulses and gradient pulses used to disturb and/or manipulate the NMV orientation, is the definition of what, in regards to MRI?
- A.
Phase encoding
- B.
Pulse Sequence
- C.
ETL
- D.
Frequency encoding
Correct Answer
B. Pulse SequenceExplanation
A pulse sequence in MRI refers to a specific combination and timing of excitation and gradient pulses that are used to disturb and manipulate the nuclear magnetic vector (NMV) orientation. This sequence determines the contrast, resolution, and other imaging characteristics of the MRI scan. It includes the excitation pulse that tips the NMV into the transverse plane, gradient pulses that encode spatial information, and other pulses for signal acquisition and manipulation. The pulse sequence is a crucial component of MRI imaging and different sequences are used for different types of imaging and clinical applications.Rate this question:
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- 4.
If echoes are sampled at 60, 80, and 100 msec, the echo spacing is?
- A.
20ms
- B.
15ms
- C.
30ms
- D.
10ms
- E.
40ms
Correct Answer
A. 20msExplanation
The echo spacing can be determined by finding the time difference between consecutive echo samples. In this case, the time differences between the samples are 20ms (80-60) and 20ms (100-80). Since the time differences are consistent, the echo spacing is 20ms.Rate this question:
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- 5.
When inversion recovery is used to produce predominantly heavily T1 weighted images at low field, the TE controls the amount of T2 decay, so it is usually kept short to minimize T2 effects.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Inversion recovery is a technique used to produce heavily T1 weighted images at low field. In this technique, the TE (echo time) parameter controls the amount of T2 decay. To minimize T2 effects and enhance T1 weighting, the TE is usually kept short. Therefore, the statement "When inversion recovery is used to produce predominantly heavily T1 weighted images at low field, the TE controls the amount of T2 decay, so it is usually kept short to minimize T2 effects" is true.Rate this question:
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- 6.
In an FSE sequence, if you have the following parameters, how fast will your scan time be? 4000ms TR, 1 NSA, 256x256 matrix, 16 ETL
- A.
2 minutes
- B.
1.07 minutes
- C.
1.07 seconds
- D.
50 seconds
- E.
2.14 minutes
Correct Answer
B. 1.07 minutesExplanation
The scan time can be calculated by multiplying the TR (4000ms) by the number of averages (1 NSA) and the number of echoes (16 ETL). The product is then divided by 60 to convert it to minutes. Therefore, the scan time is 1.07 minutes.Rate this question:
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- 7.
Inversion time is the time between the inversion RF Pulse and the 180o rephasing pulse?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the inversion time is the time between the inversion RF pulse and the imaging sequence, not the 180o rephasing pulse. The 180o rephasing pulse is used to restore the magnetization to its original longitudinal direction before the imaging sequence begins. Therefore, the inversion time does not include the time between the inversion RF pulse and the 180o rephasing pulse.Rate this question:
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- 8.
The STIR time for fat is approximately how much?
- A.
1000-1200ms
- B.
100-175ms
- C.
1700-2200ms
- D.
500-700ms
Correct Answer
B. 100-175msExplanation
The STIR time for fat refers to the time it takes for fat to recover its magnetization after being saturated. In this case, the correct answer is 100-175ms, which means that it takes approximately 100 to 175 milliseconds for fat to recover its magnetization.Rate this question:
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- 9.
The advantage of using Driven Equilibrium is _________________.
- A.
Increased T1 weighting on long TR sequences.
- B.
Increased scan times.
- C.
Increased image resolution.
- D.
Increase in signal intensity in fluid-based structures
Correct Answer
D. Increase in signal intensity in fluid-based structuresExplanation
Driven Equilibrium is a technique used in MRI imaging to increase the signal intensity in fluid-based structures. By using a combination of RF pulses and gradients, the technique manipulates the magnetization of the fluid molecules, resulting in a higher signal intensity. This allows for better visualization and characterization of fluid-filled structures in the body, such as blood vessels or cerebrospinal fluid. The advantage of using Driven Equilibrium is therefore an increase in signal intensity in fluid-based structures.Rate this question:
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- 10.
As ETL increases, scan time is increased.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement suggests that as ETL (Extract, Transform, Load) increases, the scan time also increases. However, the correct answer is False. This means that there is no direct relationship between ETL and scan time. Increasing the ETL process does not necessarily result in an increase in scan time. Other factors such as data volume, complexity of transformations, and hardware capabilities can also impact scan time.Rate this question:
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- 11.
A technique used in Fast Spin Echo in which a reverse flip angle is applied at the end of the echo train in order to push any transverse magnetization back into the longitudinal plane is known as _______________.
- A.
Gradient Echo
- B.
Driven Equilibrium
- C.
Half Fast Spin Echo
- D.
Inversion Recovery
Correct Answer
B. Driven EquilibriumExplanation
Driven Equilibrium is a technique used in Fast Spin Echo where a reverse flip angle is applied at the end of the echo train. This reverse flip angle helps to push any remaining transverse magnetization back into the longitudinal plane. By doing so, it helps to reduce the residual transverse magnetization and improve the contrast in the resulting image.Rate this question:
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- 12.
In regards to the effective TE in Fast Spin Echo imaging, the echo data at the time of the effective TE is stored wherein k-space?
- A.
In the center
- B.
In numerical order from top to bottom.
- C.
Randomly
- D.
Around the outer edges.
Correct Answer
A. In the centerExplanation
In Fast Spin Echo imaging, the echo data at the time of the effective TE is stored in the center of k-space. This is because the center of k-space contains low spatial frequencies, which are important for image contrast and resolution. Storing the echo data in the center allows for better image quality and reduces artifacts.Rate this question:
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- 13.
How many lines of K space are acquired for an SS-FSE sequence?
- A.
Quarter
- B.
Half
- C.
Third
- D.
All
Correct Answer
B. HalfExplanation
For an SS-FSE sequence, half of the K space lines are acquired. This means that only half of the spatial frequency information is collected during the acquisition. The SS-FSE sequence is a fast spin echo sequence that uses a reduced number of echoes to speed up the imaging process. By acquiring only half of the K space lines, the sequence can be completed faster while still providing sufficient image quality.Rate this question:
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- 14.
An MRI sequence that utlizes multiple 180 degree refocusing pulses is known as a/an ____________.
- A.
Spin Echo
- B.
Inversion Recovery
- C.
Fast (Turbo) Spin Echo
- D.
Gradient Echo
Correct Answer
C. Fast (Turbo) Spin EchoExplanation
A Fast (Turbo) Spin Echo MRI sequence utilizes multiple 180-degree refocusing pulses. This sequence is designed to reduce the scanning time by acquiring multiple echoes in a single repetition time (TR). It is called "fast" because it allows for faster imaging compared to traditional spin echo sequences. The term "turbo" refers to the use of an echo train, where multiple echoes are acquired in rapid succession, further reducing the scan time. Therefore, the correct answer is Fast (Turbo) Spin Echo.Rate this question:
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- 15.
Spin echo pulse sequences are all of the following except:
- A.
SE
- B.
IR
- C.
EPI
- D.
FSE
Correct Answer
C. EPIExplanation
Spin echo pulse sequences are a type of magnetic resonance imaging (MRI) technique that involves the use of a 180-degree radiofrequency pulse to reverse the dephasing of spins in the tissue. This results in the generation of a spin echo signal, which is then used to create the MRI image. EPI (Echo Planar Imaging) is a different type of pulse sequence that is not a spin echo sequence. EPI uses a train of RF pulses and rapidly varying gradients to acquire multiple echoes in a single excitation, allowing for fast imaging. Therefore, EPI is not a spin echo pulse sequence.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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May 09, 2017Quiz Created by
Breanna
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