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The experiment was repeated M = 100 number of times, wherein the strength of the pulse was incremented with each phase encoding step according to [g.sub.[alpha]] = [alpha] - M/2 - 1/2.
According to the inventors, the very small size of the resolvable spatial element in the hologram (approx 0.01[micro]) is one of the factors which makes the key very difficult to decipher, and is made more difficult by the amplitude phase encoding of the wave.
However, standard fast spin echo includes extra phase encoding gradients that follow each 180 [degrees] pulse.