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FSP MRI in Practice Pract 05

  1. Spin-Lattice Relaxation
    T1
  2. time to get to a point where longitudinal magnetization has recovered to 63% of its final value in the tissue
    T1
  3. ↓TR - ↓TE
    T1
  4. TR primarily controls the contrast
    T1
  5. energy given to surrounding tissue (another lattice)- shows anatomy (bone)
    T1
  6. shows anatomy (bone)
    T1
  7. fluid is dark
    T1
  8. T1

    TR - TE - ?
    ↓TR (300-700 ms) ↓TE (10-30 ms)
  9. T1
    - terminology
    - TR - TE
    - what controls contrast
    - what happen to energy
    - shows
    - fluid
    • - Spin-Lattice Relaxation
    • - time to get to a point where longitudinal magnetization has recovered to 63% of its final value in the tissue
    • - ↓TR (300-700 ms) ↓TE (10-30 ms)
    • - TR primarily controls the contrast
    • - energy given to surrounding tissue (another lattice)- shows anatomy (bone)
    • - shows anatomy (bone)
    • - in T1 fluid is dark
  10. Spin-Spin Relaxation
    T2
  11. time to get to a point where transverse magnetization decay to 37% of its original value
    T2
  12. ↑TR - ↑TE
    T2
  13. TE primarily controls the contrast
    T2
  14. energy is exchanged to other spin of the same lattice
    T2
  15. shows pathology
    T2
  16. fluid is bright
    T2
  17. T2

    TR - Te - ?
  18. T2
    - terminology
    - TR - TE
    - what controls contrast
    - what happen to energy
    - shows
    - fluid
    • - Spin-Spin Relaxation
    • - time to get to a point where transverse magnetization decay to 37% of its original value
    • - ↑TR (2000 ms +) ↑TE (80 ms)
    • - TE primarily controls the contrast
    • - energy is exchanged to other spin of the same lattice
    • - shows pathology (fluid is bright)
  19. occurs due to inhomogeneous magnetic field
    PD
  20. occur before T1 and T2
    PD
  21. ↑TR - ↓TE
    PD
  22. PD

    TR - TE - ?
    ↑TR (2000 ms +) ↓TE (20 ms)
  23. PD
    • - occurs due to inhomogeneous magnetic field in different areas (lower/higher than center)
    • - occur before T1 and T2
    • - ↑TR (2000 ms +) ↓TE (20 ms)
    • - differences b/w the tissues are minimized
  24. Turbo Spin Echo
    FSE
  25. Fast Spin Echo
    FSE
  26. start w 90 followed by a train of 180
    • FSE
    • Fast or (Turbo) Spin Echo
  27. Turbo Factor or ETL
    # of 180 pulses after the 90 pulse in FSE
  28. # of 180 pulses after the 90 pulse in FSE
    Turbo Factor or ETL
  29. FSE
    • Fast or (Turbo) Spin Echo
    • - start w 90 followed by a train of 180
    • - number of 180 rephasing pulses corresponds to the echoes produced per TR
    • Turbo Factor or ETL - # of 180 pulses after the 90 pulse
  30. FSE T1 parameters
    • TR: 300-700 ms
    • Effective TE: MIN
    • Turbo Factor: 2-8
  31. FSE PD Parameters
    • TR: 3000-10000 ms (depending on slice number)
    • Effective TE: MIN
    • Turbo Factor: 2-8
  32. FSE T2 parameters
    • TR: 3000-10000 ms (depending on slice number)
    • Effective TE: 80-140
    • Turbo Factor: 12-30
  33. start w 180 followed by 90
    IR
  34. TI
    • in IR
    • TAU – Time to invert (delay between 180° and 90°)
  35. TAU
    • in IR
    • TI – Time to invert (delay between 180° and 90°)
  36. What sequence is used to produce heavily T1
    IR
  37. What sequence is used to demonstrate anatomy (contrast injection)
    IR
  38. In what sequence bone black - if white - pathology
    IR
  39. IR
    • Inversion Recovery
    • - start w 180 followed by 90
    • - TI – TAU – Time to invert (delay between 180° and 90°)
    • - TI controls contrast
    • - used to produce heavily T1, to demonstrate anatomy (contrast injection)
    • - Bone black - if white - pathology
  40. IR T1 parameters
    • TR - 3000+ ms
    • TE - 10-20 ms
    • TI - 400-800 ms
  41. IR PD parameters
    • TR - 3000+ ms
    • TE - 10-20 ms
    • TI - 1800 ms
  42. IR pathology parameters
    • TR - 3000+ ms
    • TE - 70 ms
    • TI - 400-800 ms
  43. In what sequence fat is nulled in T1
    STIR
  44. what sequence should NOT BE USED with contrast?
    STIR
  45. In what sequence lesion and tumors are seen more clearly?
    STIR
  46. STIR
    • Short TAU IR
    • - short TAU means no longitudinal magnetization corresponding to fat
    • - signal from fat is nulled in T1
    • - should NOT BE USED with contrast

    • Uses
    • - in musculoskeletal imaging
    • - lesion and tumors are seen more clearly
  47. STIR parameters
    • TR - 4000 ms
    • TE - 150-175 ms
    • TI - 50 ms
    • Turbo Factor - 16-20
  48. In what sequence signal from CSF is nulled in T2
    FLAIR
  49. what sequence is used to see meningitis
    FLAIR
  50. what sequence is used to see sub-arachnoid hemorrhage
    FLAIR
  51. what sequence is used to see MS
    FLAIR
  52. what sequence is used to see periventricular and cord lesions
    FLAIR
  53. FLAIR
    • Fluid Attenuated IR
    • - long TAU means no longitudinal magnetization corresponding to CSF
    • - signal from CSF is nulled in T2

    • Uses
    • - in brain and spine to see
    •    - periventricular and cord lesions
    •    - MS
    •    - sub-arachnoid hemorrhage
    •    - meningitis
  54. FLAIR parameters
    • TR - 6000 ms
    • TE - 1700-2200 ms
    • TI - 70 ms
    • Turbo Factor - 16-20
Author
flashsmilenet
ID
360369
Card Set
FSP MRI in Practice Pract 05
Description
FSP MRI in Practice Pract 01
Updated

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