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Steady State Free Precession (SSFP) Transient Reduction

Steady State Free Precession (SSFP) Transient Reduction. MR Study Group 2/29/2008 Thomas Sushil John. Introduction. General SSFP Pulse Sequence. Introduction. Flip = 30 degrees, T1=870ms, T2=100ms. Introduction. Flip = 60 degrees, T1=870ms, T2=100ms. Introduction.

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Steady State Free Precession (SSFP) Transient Reduction

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  1. Steady State Free Precession (SSFP) Transient Reduction MR Study Group 2/29/2008 Thomas Sushil John

  2. Introduction General SSFP Pulse Sequence

  3. Introduction Flip = 30 degrees, T1=870ms, T2=100ms

  4. Introduction Flip = 60 degrees, T1=870ms, T2=100ms

  5. Introduction Flip = 60 degrees, T1=500ms, T2=200ms

  6. Introduction z y x

  7. Introduction x y x y

  8. Introduction z y y x

  9. Introduction z y x x

  10. Nishimura et. al., ISMRM 2000 T1 = 200 TR T2 = 40 TR Flip angle = 30 degrees a b c

  11. Nishimura et. al., ISMRM 2000 Deimling & Heid’s method - Introduce zeroes at i and -i a b c

  12. Nishimura et. al., ISMRM 2000 Nishimura & Vasanawala’s method - Introduce zeroes around the unit circle a b c

  13. Hargreaves et. al., MRM 2001 Qk = Mk - Mss

  14. Hargreaves et. al., MRM 2001 + : 0 Hz off-resonance x : 30 Hz off-resonance

  15. Hargreaves et. al., MRM 2001

  16. Hargreaves et. al., MRM 2001 Pulse Sequence for Magnitude scaling

  17. Hargreaves et. al., MRM 2001

  18. Hargreaves et. al., MRM 2001 SSFP Sequence: - 60 degrees flip angle - TR = 8 ms, TE = 4 ms - 12 s recovery between phase encodes

  19. Hargreaves et. al., MRM 2001

  20. Hargreaves et. al., MRM 2001

  21. Le Roux, JMR 2003 a b

  22. Le Roux, JMR 2003 Effective axis of rotation

  23. Le Roux, JMR 2003

  24. Le Roux, JMR 2003

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