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Draw gradient echo pulse sequence. How is it weighted
- T2* and T1
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Draw inversion recovery sequence. What weighting is it
- T1 weighted
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What is T1's name, what is it due to and is it dependent on B0?
- T1 is Longitudinal spin-lattice. (associated with Mz relaxation)
- Its is due to exchange of energy between spins and lattice
- It is ∝ B01/3 (long for fluids)
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What is T2's name, what is it due to and is it dependent on B0?
- T2 is called transverse spin spin (causes spin spin relaxation)
- It is due to ONLY spin dephasing and spin spin interactions
- It is not dependent on B0 (long for fluids)
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What is T2*'s name, what is it due to and is it dependent on B0?
- T2* is just T2*
- It is due to both spin dephasing from spin spin interactions as well as B0 non-uniformity.
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What is formula for resolution in K-space MRI?
FOV/Nx
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When do hydrogen nuclei have a spin?
Always
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Why do hydrogen nuclei precess?
Because they have mass and their spins interact with a strong B0 field.
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How do you get a maximum spin echo MRI signal?
Short TE, Long TR
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Ho do you get a maximum T1 contrast signal?
Short TE, short TR
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WHen we increase the strength of the magnetic field B0, does the strength of the spin echo sequence increase decrease or stay the same?
Stay the same
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