Magnetic field gradient pulse used to create spatial variation of phase of transverse magnetization. For example, it may be applied prior to signal detection in the presence of a magnetic field gradient with opposite polarity (or of the same polarity if separated by a refocusing RF pulse) so that the resulting gradient echo signal will represent a more complete sampling of the Fourier transformation of the desired image.

See also Spoiler Gradient Pulse.

Use of multiple RF pulses with an inhomogeneous RF field to enable acquiring data from only selected regions within the field. This provides a 'one-dimensional' localization along isocontours of the B1 field.

(DRESS) Depth resolved surface spectroscopy is a localization method that employ gradients to select the region from which spectra are acquired.

Part of the receiver that demodulates the RF signal and converts it to a lower frequency signal. Most detectors are phase sensitive (e.g., quadrature detector / demodulator) and will also give phase information about the RF signal.

Chemical, usually phenidone, hydroquinone or metole, which reduces exposed silver ions to atomic silver.