Phase-encoding gradient

Figure 3 describes for nine magnetization vectors the effect of the appHcation of a phase-encoding gradient, G, and a frequency-encoding gradient, G. ... 

Referring to phase encoding gradient pulses according to Figure 2.9.4(b), the digital resolution and the velocity field of view are given by [28]... 

In this example, the gradient applied in the y-direction is referred to as the phase encoding gradient. Phase encoding refers to the action of an applied gradient that is responsible for moving the acquisition through the k-space raster. In this case, the... 

FIGURE 14.2 Pulse sequence for a two-dimensional NMR image in the xy plane, with slice selection along z. The value of the phase-encode gradient Gx is altered in successive repetitions, as indicated. The rf pulses are frequency selective and define the slice while gradient Gz is applied. Within one value of Gx there may be several repetitions with different values of frequency to obtain data from multiple slices. Data are acquired from the spin echo while the readout gradient Gy is applied. 

FIGURE 14.3 Pulse sequence for echo-planar imaging. Slice selection is carried out as in Fig. 14.2. The readout gradient Gy is rapidly switched in direction in synchrony with application of a pulsed phase-encode gradient G as indicated. Data are acquired while Gy is turned on but Gx is off. 

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