Pulse sequence
From ISMRMWiki
A pulse sequence is a temporal series of radiofrequency and gradient pulses that manipulate the magnetization of a set of spins, in order to obtain an image or a spectrum.
Depending on the presence of spatial encoding, pulse sequences are classified as imaging sequences or spectroscopy sequences (less commonly used is the conjunction of both: MRSI).
Imaging sequences
Imaging sequences use gradients in order to encode spatial information in the MRI signal, so that after appropriate numerical manipulation (typically involving a Fourier transform), a picture can be obtained. The timings and the order in which the various pulses are played in the sequence determines its contrast, enhancing a particular physical or physiological property of the sample or of the tissue.
