In MRI, what is the purpose of using gradient magnetic fields during imaging?

To create spatial encoding of the MR signal

To enhance contrast in T1-weighted images

To refocus the MR signal after excitation

The time between the RF excitation pulse and the peak of the MR signal

The time between successive RF pulses in a spin echo sequence

The time constant for spins to recover longitudinal magnetization

How does increasing the bandwidth of the RF pulse affect the MRI signal?

Decreases signal-to-noise ratio (SNR)

Enhances contrast in T2-weighted images

In MRI, what does the term "flip angle" refer to?

The angle between the main magnetic field and the RF pulse

The angle between the main magnetic field and the imaging gradient

What effect does decreasing the echo time (TE) have on T2-weighted imaging in MRI?

Increases signal-to-noise ratio (SNR)

Reduces susceptibility artifacts

What is the purpose of applying a spoiler gradient in MRI sequences?

To dephase remaining transverse magnetization

What is the principle behind diffusion-weighted imaging (DWI) in MRI?

It detects the movement of water molecules

It measures the flow of blood in vessels

It reduces susceptibility artifacts

How does increasing the field of view (FOV) affect spatial resolution in MRI?

Does not affect spatial resolution

What is the primary advantage of using parallel imaging techniques in MRI?

Increased signal-to-noise ratio (SNR)

Reduced susceptibility artifacts

Which MRI sequence is particularly useful for imaging dynamic processes such as perfusion in brain imaging?

Dynamic contrast-enhanced imaging

How does increasing the echo train length (ETL) affect image contrast in MRI?

Reduces susceptibility artifacts

What is the primary function of the pre-polarization pulse in MRI sequences?

To align the spins with the main magnetic field

To reduce susceptibility artifacts

What is the purpose of using a refocusing pulse in spin echo MRI sequences?

To dephase the transverse magnetization

To reverse phase-encoding gradient

How does increasing the receiver bandwidth affect MRI image quality?

Improves signal-to-noise ratio (SNR)

Reduces susceptibility artifacts

What is the main advantage of using a 3 Tesla MRI scanner over a 1.5 Tesla scanner?

Higher signal-to-noise ratio (SNR)

Reduced susceptibility artifacts

What is the purpose of using a spoiler gradient at the end of an MRI sequence?

To dephase residual transverse magnetization

How does increasing the bandwidth of the RF pulse affect the slice profile in MRI?

Does not affect the slice profile

What is the main purpose of using an inversion pulse in inversion recovery (IR) sequences?

To null the longitudinal magnetization

To suppress signal from flowing blood

What does the term "k-space" refer to in MRI imaging?

The frequency domain representation of the MR signal

The physical space occupied by the MRI scanner

The spatial encoding of MRI slices

The temporal resolution of MRI sequences

What effect does increasing the flip angle have on T1-weighted imaging in MRI?

Reduces susceptibility artifacts

In MRI, what is the function of the receiver coil?

To receive the MR signal from the patient

To create the main magnetic field

MRI Quiz

Quiz

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Specialty

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University

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Practice Problem

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Medium

Wilton Muriithi

Used 5+ times

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78 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the term "spin-lattice relaxation time" (T1) represent in MRI?

The time constant for spins to lose coherence due to magnetic field inhomogeneities

The time constant for spins to regain longitudinal magnetization

The time constant for spins to achieve transverse magnetization

The time constant for spins to lose coherence due to spin-spin interactions

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a characteristic property of T2 relaxation time in MRI?

It is shorter than T2 relaxation time

It is influenced by magnetic field inhomogeneities

It represents the time constant for spins to return to equilibrium

It is not affected by the presence of paramagnetic substances

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In MRI, what is the role of the radiofrequency (RF) coil during imaging?

It creates the main magnetic field

It receives the MR signal from the patient

It amplifies the MR signal before detection

It enhances spatial resolution of the images

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which MRI sequence is typically used for imaging T2-weighted images?

Gradient echo (GRE)

Inversion recovery (IR)

Spin echo (SE)

Echo-planar imaging (EPI)

5.

OPEN ENDED QUESTION

3 mins • 1 pt

What is the purpose of applying a slice-selective RF pulse in MRI?

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6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

To excite spins within a specific slice

To refocus spins after dephasing

To dephase spins for T2-weighted imaging

To reduce T1 relaxation times

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following imaging artifacts is caused by magnetic field inhomogeneities in MRI?

Chemical shift artifact

Aliasing artifact

Zipper artifact

Flow artifact

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MRI Quiz

78 questions

What does the term "spin-lattice relaxation time" (T1) represent in MRI?

Which of the following is a characteristic property of T2 relaxation time in MRI?

In MRI, what is the role of the radiofrequency (RF) coil during imaging?

Which MRI sequence is typically used for imaging T2-weighted images?

What is the purpose of applying a slice-selective RF pulse in MRI?

To excite spins within a specific slice

Which of the following imaging artifacts is caused by magnetic field inhomogeneities in MRI?

What physical parameter is primarily responsible for the difference in signal intensity between fat and water in MRI?

In MRI, what is the purpose of using gradient magnetic fields during imaging?

What does the term "echo time" (TE) refer to in MRI sequences?

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