Podcast
Questions and Answers
What is one difference between a gradient echo and a spin echo sequence?
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?
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?
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?
What is the main difference between T1 and T2 in MRI sequences?
What is the purpose of changing the repetition time (TR) in creating a T1-weighted image?
What is the purpose of changing the repetition time (TR) in creating a T1-weighted image?
What does a T1-weighted image weighting help in identifying?
What does a T1-weighted image weighting help in identifying?
What is a multiparametric MRI?
What is a multiparametric MRI?
What is the purpose of a spin echo in MRI sequences?
What is the purpose of a spin echo in MRI sequences?
Flashcards
Gradient Echo vs. Spin Echo
Gradient Echo vs. Spin Echo
Gradient echo has a shorter echo time than spin echo and is more sensitive to flow, while spin echo is more susceptible to magnetic susceptibility artifacts.
T1 vs. T2 MRI
T1 vs. T2 MRI
T1 sequence measures magnetization parallel to the static magnetic field, while T2 measures magnetization perpendicular. T1 shows different tissues differently due to these differences.
Repetition Time (TR)
Repetition Time (TR)
TR in MRI is the time it takes for magnetization to recover before the next excitation pulse.
T1-weighted Image
T1-weighted Image
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Multiparametric MRI
Multiparametric MRI
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Spin Echo in MRI
Spin Echo in MRI
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Flow Artifacts
Flow Artifacts
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Magnetic Susceptibility Artifacts
Magnetic Susceptibility Artifacts
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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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