MRI Frequency and Slice Select Gradient Quiz

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Questions and Answers

What is the main purpose of data acquisition in MRI?

To create gradient slopes

To generate the spatial encoding (correct)

To select the slices

To activate the transmit RF pulse

Which of the following effects can excessive use of gradients during MRI scanning lead to?

Vision of flashing lights

Transmit RF pulse activation

Involuntary muscle contractions (correct)

Peripheral Nerve stimulation

What determines the slice thickness in MRI imaging?

Width of the RF Transmit Bandwidth

Frequency of the RF excitation pulse

Slope of the slice selection gradient (correct)

Amplitude of the RF excitation pulse

What is the primary downside of sequential data acquisition in MRI?

Extended scan times Signup and view all the answers

Which factor affects achieving thicker slices in MRI imaging?

Wider Transmit Bandwidth Signup and view all the answers

In MRI, what does double angulation refer to?

Slice selection method Signup and view all the answers

How does two-dimensional (2D) data acquisition differ from sequential acquisition in MRI?

It acquires all data from each slice simultaneously Signup and view all the answers

What is the purpose of the RF Transmit Bandwidth in MRI?

To set the RF pulse frequency range Signup and view all the answers

How does a narrower Transmit Bandwidth affect slice thickness in MRI imaging?

Thinner slices are achieved Signup and view all the answers

What effect can be caused by excessive use of gradients during MRI scanning?

Cardiac arrhythmias Signup and view all the answers

What plays a significant role in spatially encoding slices in MRI imaging?

Gradient Activation Signup and view all the answers

In MRI, what role does the slope of the slice selection gradient play?

Determines slice thickness Signup and view all the answers

What is the purpose of the gradient used for slice selection in MRI imaging?

To select the slice orientation Signup and view all the answers

During MRI imaging, when is the slice selection gradient activated?

After the application of RF exaltation pulses Signup and view all the answers

How does a shallow slice select gradient affect the thickness of the slices in MRI imaging?

Thicker slices are achieved Signup and view all the answers

In MRI imaging, what is the role of the transmit RF pulse?

To excite the protons Signup and view all the answers

Which gradient function in MRI imaging is responsible for selecting the plane that will be imaged?

Slice selection gradient Signup and view all the answers

What happens to protons after the slice has been selected in MRI imaging?

They are all in a longitudinal plane Signup and view all the answers

Study Notes

Data Acquisition in MRI

The main purpose of data acquisition in MRI is to collect data that will be used to reconstruct images of the body.

Effects of Excessive Gradient Use

Excessive use of gradients during MRI scanning can lead to nerve stimulation, muscle contraction, and even cardiac arrhythmias.

Slice Thickness Determination

The slice thickness in MRI imaging is determined by the slope of the slice selection gradient.

Sequential Data Acquisition

The primary downside of sequential data acquisition in MRI is that it is time-consuming.

Achieving Thicker Slices

A shallow slice select gradient affects the thickness of the slices, allowing for thicker slices to be achieved.

Double Angulation

Double angulation in MRI refers to the rotation of the patient's body in two planes (axial and sagittal) to achieve the desired slice orientation.

2D Data Acquisition vs Sequential Acquisition

In MRI, two-dimensional (2D) data acquisition differs from sequential acquisition in that 2D acquisition involves collecting data from multiple slices simultaneously, whereas sequential acquisition collects data from one slice at a time.

RF Transmit Bandwidth

The purpose of the RF Transmit Bandwidth in MRI is to determine the frequency range of the RF pulse, which affects the slice thickness.
A narrower Transmit Bandwidth affects slice thickness by allowing for thinner slices to be achieved.

Gradient Use in MRI

Excessive use of gradients during MRI scanning can cause nerve stimulation, muscle contraction, and even cardiac arrhythmias.
The slope of the slice selection gradient plays a significant role in spatially encoding slices in MRI imaging.
The gradient used for slice selection in MRI imaging is responsible for selecting the plane that will be imaged.
The slice selection gradient is activated during MRI imaging when the RF pulse is applied.

Transmit RF Pulse

The role of the transmit RF pulse in MRI imaging is to excite the protons in the selected slice.

Gradient Functions

The gradient function responsible for selecting the plane that will be imaged in MRI imaging is the slice selection gradient.
After the slice has been selected, the protons will be spatially encoded and prepared for signal emission.

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Description

Test your knowledge on MRI frequency and slice select gradient parameters. Questions cover topics such as Bo values, RF frequencies, and how gradient slopes impact slice thickness in MRI imaging.