Gradient coils

The essential extra prerequisite is gradient coils capable of very rapidly blipping the external magnetic field for echoplanar imaging. The gradients required are small compared with the external field (1 to 10 mT/m) but may need to be applied for less than 1 ms. The speed with which the gradient is switched on, the slew rate, is necessarily fast (up to 200 mT/m/s). Such rapidly changing gradients can cause eddy currents in the gradient coils, adversely affecting the homogeneity of the field. This problem is minimized by actively shielding the coils, which requires yet another set of coils.

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