Biomedical imaging MRI

  1. Draw gradient echo pulse sequence. How is it weighted
    • T2* and T1
    • Image Upload 1
  2. Draw spin echo sequence
    Image Upload 2
  3. Draw inversion recovery sequence. What weighting is it
    • T1 weighted
    • Image Upload 3
  4. 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)
  5. 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)
  6. 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.
  7. What is formula for resolution in K-space MRI?
    FOV/Nx
  8. When do hydrogen nuclei have a spin?
    Always
  9. Why do hydrogen nuclei precess?
    Because they have mass and their spins interact with a strong B0 field.
  10. How do you get a maximum spin echo MRI signal?
    Short TE, Long TR
  11. Ho do you get a maximum T1 contrast signal?
    Short TE, short TR
  12. 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
Author
keesukim
ID
340207
Card Set
Biomedical imaging MRI
Description
MRI innit
Updated