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MRI Sequence Quiz

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Questions and Answers

What is one difference between a gradient echo and a spin echo sequence?

Gradient echo has lower signal-to-noise ratio than spin echo

Gradient echo has shorter echo time than spin echo (correct)

Gradient echo has higher signal-to-noise ratio than spin echo

Gradient echo has longer echo time than spin echo

Which characteristic differs between gradient echo and spin echo sequences?

Spin echo has higher T2* weighting than gradient echo

Gradient echo is more susceptible to chemical shift artifacts

Gradient echo has higher T1 weighting than spin echo

Spin echo is more susceptible to magnetic susceptibility artifacts (correct)

What distinguishes gradient echo from spin echo sequences?

Spin echo is more sensitive to gradient field inhomogeneities

Gradient echo is more sensitive to flow-related enhancement (correct)

Spin echo is more sensitive to T1 relaxation effects

Gradient echo is more sensitive to T2 relaxation effects

What is the main difference between T1 and T2 in MRI sequences?

T1 involves magnetization in the same direction as the static magnetic field, while T2 involves magnetization transverse to the static magnetic field Signup and view all the answers

What is the purpose of changing the repetition time (TR) in creating a T1-weighted image?

To allow magnetization to recover before measuring the MR signal Signup and view all the answers

What does a T1-weighted image weighting help in identifying?

Cerebral cortex and fatty tissue Signup and view all the answers

What is a multiparametric MRI?

A combination of two or more sequences, and/or including other specialized MRI configurations such as spectroscopy Signup and view all the answers

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

To allow tissues to return to their equilibrium state after excitation Signup and view all the answers

Study Notes

MRI Sequences

Gradient echo and spin echo sequences differ in the way they handle magnetic field inhomogeneities.
Gradient echo sequences are more sensitive to magnetic field inhomogeneities, whereas spin echo sequences are less sensitive.

T1 and T2 in MRI Sequences

The main difference between T1 and T2 is the relaxation time: T1 is the longitudinal relaxation time, whereas T2 is the transverse relaxation time.

Creating a T1-weighted Image

Changing the repetition time (TR) in creating a T1-weighted image affects the contrast between different tissues based on their T1 relaxation times.
A shorter TR helps in creating a T1-weighted image, which is useful for identifying fat and normal tissues.

T1-weighted Image

A T1-weighted image helps in identifying anatomy and morphology, particularly fat and normal tissues.

Multiparametric MRI

A multiparametric MRI uses multiple parameters such as T1, T2, and diffusion-weighted imaging to provide a more comprehensive understanding of the imaged tissue.

Spin Echo in MRI Sequences

The purpose of a spin echo in MRI sequences is to refocus the spin magnetization, which helps in reducing the effects of magnetic field inhomogeneities.

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Description

Test your knowledge of MRI sequences with this quiz! Discover the two key differences between gradient echo and spin echo sequences. Challenge yourself to identify the distinguishing characteristics of each sequence.