- Fast spin-echo (FSE) sequences provide similar contrast weighting to SE sequences, but with reduced scan times.
- The echo train length (ETL) in FSE describes the number of echoes acquired after each excitation; each echo corresponds to a different phase-encoding view (or line in k-space).
- Echo planar imaging (EPI) acquires extremely fast images but at limited spatial resolution and contrast weighting; more sensitive to chemical shift artifacts.
- Short TI inversion recovery (STIR) sequences provide fat suppression by selection of a TI value that nulls the signal from fat; STIR is a useful substitute for fat-suppressed T2W SE or FSE sequences.
Monday, April 25, 2011
MRI take home point (8)
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