Fig. 1
Pulse sequence diagram and k-space trajectory design. a Pulse sequence diagram for the spiral real-time balanced steady state free precession (bSSFP) technique. TE = 0.67 ms, TR = 3.34 ms. The refocusing nulls the zeroth moments of the gradient waveform only, b k-space trajectory, showing 9 consecutive TRs. The angle increment between successive spoke numbers is constant with an angle of \( {360}^o/\left(6+\frac{\left(1+\sqrt{5}\right)}{2}\right) \) ≈ 47.26o