MRI - Spin echo and gradient echo
4 important questions on MRI - Spin echo and gradient echo
After how much time do you place the 180 degree RF pulse?
What happens when you add a pulse long enough that is will cause a 180 degree pulse? (3)
- The nuclei become in a higher energy state (anti paralel)
- You can compensate for field inhomogeneities.
- The order of spins with higher and lower frequencies is reversed
What is the difference between a gradient echo and a spin echo?(5)
- The gradient echo uses a dephasing and readout gradient to get all the nulei in phase again
- The spin echo uses a 180 degree pulse
- You can echo faster with a gradient echo.
- The repetition time is much shorter in gradient echo
- High quality pictures in gradient echo
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What happens with gradient echo?
- Dephasing gradient; allow some spins to spin faster and some slower
- Gradient at the opposite direction; twice the amount of time: so now it is the other way around, some spins go slower and some faster.
- You echo at the time of the second opposite gradient
- Your signal is similar to your free induction decay.
The question on the page originate from the summary of the following study material:
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