In:
Magnetic Resonance in Medicine, Wiley, Vol. 64, No. 5 ( 2010-11), p. 1440-1445
Abstract:
Measuring T 2 at 7.0 T is not trivial due to RF inhomogeneity effects, however, gradient echo sampling of a spin echo is insensitive to RF pulse errors, does not suffer from significant distortions, and allows T ′ 2 and T 2 to be estimated simultaneously. Gradient echo sampling of a spin echo results are relatively sensitive to noise and therefore fitting methods and timing parameters were optimized: a weighted linear fit reduced the errors in T 2 compared to a nonlinear fit, the optimum spin echo time was approximately equal to the expected T 2 and decreasing the number of gradient echoes minimized the error of the estimated T 2 . T 2 , T ′ 2 , and T * 2 decreased with field strength in frontal gray matter, occipital gray matter, and white matter, with T 2 having a linear dependence (frontal gray matter: 87, 76, 47 ms, occipital gray matter: 80, 68, 46 ms and white matter: 80, 71, 47 ms at 1.5, 3.0 and 7.0 T, respectively). Magn Reson Med, 2010. © 2010 Wiley‐Liss, Inc.
Type of Medium:
Online Resource
ISSN:
0740-3194
,
1522-2594
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
1493786-4
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