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Questions and Answers
Which effect does the spin echo recover dephasing due to?
Which effect does the spin echo recover dephasing due to?
What happens to the protons after a 90° RF pulse?
What happens to the protons after a 90° RF pulse?
What effect does the 180° RF pulse have on the spins?
What effect does the 180° RF pulse have on the spins?
What is the purpose of the spin echo?
What is the purpose of the spin echo?
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What effect does the spin echo have on the spins?
What effect does the spin echo have on the spins?
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Which effect does the spin echo recover dephasing due to?
Which effect does the spin echo recover dephasing due to?
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What causes the protons to dephase in the transverse plane after a 90° RF pulse?
What causes the protons to dephase in the transverse plane after a 90° RF pulse?
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What happens to the spins after a certain amount of time and a 180° RF pulse is applied?
What happens to the spins after a certain amount of time and a 180° RF pulse is applied?
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What is the purpose of the spin echo?
What is the purpose of the spin echo?
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What effect does a 180° RF pulse have on the spins?
What effect does a 180° RF pulse have on the spins?
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Study Notes
Magnetic Resonance Imaging (MRI)
- A spin echo recovers dephasing due to magnetic field inhomogeneities and spin-spin interactions.
Proton Behavior after RF Pulses
- After a 90° RF pulse, protons are aligned in the transverse plane, causing them to precess at the Larmor frequency.
- A 180° RF pulse reverses the direction of the spins, causing them to rephase.
Purpose and Effect of Spin Echo
- The purpose of the spin echo is to refocus the magnetization of protons, allowing for the creation of an MR signal.
- The spin echo has a rephasing effect on the spins, allowing them to re-align in the transverse plane.
Dephasing of Protons
- Protons dephase in the transverse plane after a 90° RF pulse due to differences in their Larmor frequencies caused by magnetic field inhomogeneities.
- A 180° RF pulse can rephase the protons, allowing them to realign in the transverse plane after a certain amount of time.
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Description
Test your knowledge on the spin echo technique with this quiz. Learn about its role in recovering dephasing and its limitations.
