The spin echo pulse sequence is one of the most important pulse sequences in MRI. Fast spin echo imaging is routinely used due to its robustness to susceptibility variations and local field inhomogeneities, as well as for its ability to produce excellent T1, T2 and PD images. The aim of this lecture is to describe the basic physical principles governing spin echo imaging and to illustrate the effect of key imaging parameters, such as TE, TR and ETL (echo train length) on image contrast.
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