E

Echo —> Spin echo.

Echo planar imaging - a technique of planar imaging in which a complete planar image is obtained from one selective excitation pulse. The FID is observed while periodically switching a field gradient to generate a train of gradient echoes. The Fourier transform of the resulting echo train can be used to produce an image of the excited plane.

Echo train - a sequence of two or more echoes generated by the application of RF pulses or gradients.

Eddy currents - electric currents induced in a conductor by a changing magnetic field or by motion of the conductor through a magnetic field. One of the sources of concern about potential hazard to subjects in very high magnetic fields or rapidly varying gradient or main magnetic fields. Can be a practical problem in the cryostat of superconducting magnets, in particular for localized spectroscopy. Can be reduced by the use of shielded gradients.

Electron spin resonance —> Magnetic resonance.

EPI —> Echo planar imaging.

ESR —> Magnetic resonance.

Even echo rephasing - even echoes in an echo train of spin echoes are compensated for the effects of flow.

Excitation - putting energy into the spin system; if a net transverse magnetization is produced, an NMR signal can be observed.

Excitation pulse - pulse used to excite the spin system.

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