Listen to this lecture on https://youtu.be/uCsu49ABeeQ -SSFP Magnetic Resonance Angiography

1. Steady
State Free
Precession
Based MRA
Rahman Ud Din
Lecturer Medical Imaging NWIHS

2. Learning Outcomes
 Residual Magnetization
 What is a SSFP?
 How SSFP can be produced?
 SSFP Based MRA
 Limitations

3. Residual Magnetization

4. SSFP-Based MRA
 Steady-state free precession(SSFP) is a type
of gradient echo MRI pulse sequence in which
a steady, residual transverse magnetization
(Mxy) is maintained between successive cycles
 The sequence is noted for its superiority in
dynamic/cine assessment of cardiac function

5.  The transverse magnetization dies out in the
middle between the RF pulses.
 If the pulses are applied sufficiently rapidly (i.e.
TR<<T2), however,
 the tails of the "FIDs" and "Echoes" will merge,
so that a continuous signal of varying
amplitude is produced.
 This is known as a steady-state free
precession (SSFP).

6. SSFP-Based MRA…
 Veins, other fluid and fat are also bright on this
seq
 Subtraction is required
 Arterial spin labeling (ASL) or inversion
recovery pulses are used
 e.g. Time SLIP, NATIVE TrueFISP, IFIR
 Used in renal and abdominal arteries

7. SSFP-Based MRA
 Balanced SSFP seq; are GRE steady
state seq;
 High SNR and motion insensitivity due
to balanced gradients in all three
directions
 They are also called TruFISP(s),
FIESTA(GE) and balanced-TFE
(Philips)
 Giving the blood very high signal
without dependence on inflow

8. Limitations;
 Relatively complex imaging and
 Susceptibility to field inhomogenities

9. SSFP-Based
Cine Imaging

10. SSFP-Based MRA