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Improved spectral selectivity and reduced susceptibility in SSFP using a near zero TE undersampled three‐dimensional PR sequence
Author(s) -
Lu Aiming,
Barger Andrew V.,
Grist Thomas M.,
Block Walter F.
Publication year - 2004
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.10435
Subject(s) - steady state free precession imaging , nuclear magnetic resonance , isotropy , resolution (logic) , materials science , sequence (biology) , pulse sequence , fast spin echo , biomedical engineering , physics , magnetic resonance imaging , computer science , chemistry , optics , radiology , artificial intelligence , medicine , biochemistry
Purpose To improve the performance of fat/water separation and reduce the sensitivity to susceptibility variation in balanced SSFP sequences. Materials and Methods Decreasing the repetition time (TR) reduces susceptibility artifacts in SSFP imaging. A shorter TR may also improve the spectral selectivity obtained when linearly combining data acquired using different radiofrequency phase cycling schedules. The desired short TR is achieved by using an angularly undersampled three‐dimensional radial acquisition sequence that achieves a near zero echo time (TE) and also a short TR. Results Images from human volunteers demonstrate broad coverage of the cervical spine and knee with isotropic resolution. Excellent fat/water separation is achieved in these studies. Conclusion The short TR capability of the proposed sequence greatly improves the fat suppression in SSFP imaging. High‐resolution volumetric T2‐like contrast imaged with reduced susceptibility artifacts can be obtained from a single acquisition using this technique. J. Magn. Reson. Imaging 2004;19:117–123. © 2003 Wiley‐Liss, Inc.