A Pulsed field gradient is a short, timed pulse with spatial dependent field intensity. Any gradient is identified by four characteristics: axis, strength, shape and duration.

Pulsed field gradient (PFG) techniques are key to magnetic resonance imagingMagnetic resonance imaging (MRI), formerly referred to as magnetic resonance tomography (MRT) and, in scientific circles, nuclear magnetic resonance imaging (NMRI) or NMR zeugmatography imaging, is a non-invasive method used to render images of the inside of an object. It is primarily used in medical imaging to demonstrate pathological or other physiological alterations ...magnetic resonance imaging, spatially selective spectroscopyNo quick definition available.spatially selective spectroscopy and studies of diffusionDiffusion is the phenomenon of random motion causing a system to decay towards uniform conditions. For example, diffusion of particles causes a net movement of particles from areas of higher concentration to areas of lower concentration until equilibrium is reached. This is simply the statistical outcome of random motion: diffusion is a spontaneous process (more familiarly known as a "passive" form ...diffusion via NMR. PFG techniques are widely used as an alternative to phase cycling in modern NMR spectroscopy.