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Reversed half‐echo stack‐of‐stars TrueFISP (TrueSTAR)
Author(s) -
Bauman Grzegorz,
Bieri Oliver
Publication year - 2016
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.25880
Subject(s) - echo (communications protocol) , stack (abstract data type) , nuclear magnetic resonance , stars , physics , astrophysics , computer science , computer network , programming language
Purpose To introduce a reversed half‐echo readout scheme for artifact‐free two‐dimensional (2D) radial and three‐dimensional (3D) stack‐of‐stars TrueFISP imaging, termed TrueSTAR. Methods TrueSTAR imaging (echo time [TE]/repetition time [TR] = 0.94/1.62 ms for 2D, TE/TR = 0.85/1.21 ms for 3D) was evaluated in phantoms and for in vivo chest imaging at 1.5T and was compared with contemporary center‐out (TE/TR = 0.66/1.62 ms for 2D, TE/TR = 0.36/1.21 ms for 3D) and symmetric (TE/TR = 0.93/1.86 ms for 2D, TE/TR = 0.85/1.70 ms for 3D) radial acquisition schemes in terms of image quality and severity of artifacts. Results Images obtained using a center‐out sampling scheme were blurred as a result of trajectory inconsistencies in the k ‐space center, whereas in vivo acquisitions with symmetric sampling were prone to banding artifacts from the increased TR, compared with center‐out and TrueSTAR acquisitions. In contrast, TrueSTAR imaging inherits both benefits, namely, a short TR from the half‐echo readout, resulting in reduced banding artifacts, and a high trajectory fidelity in the k ‐space center from center‐in trajectories, yielding an improved signal homogeneity. In addition, near artifact‐free 3D TrueSTAR chest imaging (TE/TR = 0.88/1.27 ms) is demonstrated at 3T. Conclusion TrueSTAR makes use of a generic radial sampling scheme that mitigates residual MR system imperfections, offering artifact‐free chest imaging at 1.5T. Magn Reson Med 76:583–590, 2016. © 2015 Wiley Periodicals, Inc.