Determination of optimal angles for variable nutation proton magnetic spin‐lattice,  T  1 , and spin‐spin,  T  2 , relaxation times measurement | Zendy

Deoni Sean C.L. | Zendy; Peters Terry M. | Zendy; Rutt Brian K. | Zendy

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Determination of optimal angles for variable nutation proton magnetic spin‐lattice, T 1 , and spin‐spin, T 2 , relaxation times measurement

Author(s) -

Deoni Sean C.L.,

Peters Terry M.,

Rutt Brian K.

Publication year - 2004

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.10661

Subject(s) - nutation , steady state free precession imaging , physics , nuclear magnetic resonance , spin (aerodynamics) , precession , weighting , relaxation (psychology) , range (aeronautics) , computational physics , condensed matter physics , materials science , magnetic resonance imaging , quantum mechanics , thermodynamics , composite material , medicine , psychology , social psychology , acoustics , radiology

T 1 and T 2 can be rapidly determined with a combination of multiangle spoiled gradient recalled echo (SPGR) and steady‐state free precession (SSFP) imaging. Previously, we demonstrated a simple method for determining the set of SPGR and SSFP angles that provided greater T 1 and T 2 precision than a set of uniformly spaced angles. In this article a more rigorous approach for determining angles is described. Weighted least‐squares is also introduced for T 1 and T 2 estimation and a novel weighting function described. This new approach, suited for imaging applications where large T 1 and T 2 ranges are anticipated, provides high and uniform precision over a wide range of T 1 and T 2 values. Magn Reson Med 51:194–199, 2004. © 2003 Wiley‐Liss, Inc.

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