A General Framework for Automated Accurate Calculation of b-Matrix (Auto-b) in Diffusion MRI Pulse Sequences

Figure 4

Illustration of a conventional SE imaging sequence (a) and a simulation protocol (b). In the simulation protocol, the variables i, t_i, G_i, and δ_i denote the type, start time, amplitude, and duration of the ith gradient pulse, respectively. The trapezoidal ramps have a uniform time of 200 μs. G_rdp represents the read-dephasing gradient; G_dr, G_dp, and G_ds represent diffusion-sensitizing gradients in the read, phase, and slice directions, respectively; G_cr, G_cp, and G_cs represent crusher gradients in the read, phase, and slice directions, respectively.

(a)

(b)