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Figure 9. Diagram shows the pulsed gradient SE sequence used for diffusion MR imaging. Two diffusion-encoding gradient (Gdiff ) pulses are added to the standard SE MR imaging sequence to introduce a phase shift proportional to molecular displacement along the gradient direction. 
= duration of the diffusion-encoding gradient, 
= diffusion time interval, Gphase = phase-encoding gradient, Gread = readout gradient, Gslice = section-selective gradient, RF = radiofrequency pulse, t = acquisition time. The diffusion-encoding gradient often is symbolized by the vector q, which is equal to the product of 
• • Gdiff, where is the gyromagnetic ratio; thus, it represents the effective diffusion gradient.
