Daniel Lee Shefchik1, Andrew Scott Nencka1, Andrzej Jesmanowicz1, James S. Hyde1
The gradient-echo asymmetric spin-echo pulse sequence (GREASE) allows for the production of T2 and T2* maps. In order to obtain high resolution maps, while maintaining signal, the GREASE sequence was modified to accelerate the acquisition of the images three different ways. The modifications included partial k-space GREASE , generalized autocalibrating partially parallel acquisitions (GRAPPA) Grease , and partial k-space GRAPPA GREASE. The sequences are implemented and compared to the original GREASE sequence to determine the best technique to obtain quality T2 and T2* maps.