Changing the strength of the magnetic field of a magnet. See Ramp Time.

A signal to noise improvement method that is accomplished by taking the average of several FID's made under similar conditions to suppress the effects of random variations or random artifacts.

Noise whose amplitude follows some probability distribution and is uncorrelated.

(RAM-FAST) A fast gradient echo pulse sequence using a magnetization preparation pulse.

See Ultrafast Gradient Echo Sequence.

(RARE) If the image lines from multiple echoes are used for the same image, this results in the RARE pulse sequence. The sequence is similar to fast spin echo.

See Fast Spin Echo.