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A pitfall associated with determination of transverse relaxation times of the 31P NMR signals of ATP using the Hahn spin-echo

✍ Scribed by Wulf-Ingo Jung; Klaus Straubinger; Michael Bunse; Stefan Widmaier; Fritz Schick; Klaus Küper; Günther Dietze; Prof.Dr Otto Lutz

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
391 KB
Volume
30
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

T~2~ measurements of ^31^P NMR signals of ATP using the Hahn 90°–180° spin‐echo sequence imply difficulties whenever the 180° pulse angle is not completely perfect. The reason for this finding is the crucial influence of the J ‐couplings of the ATP signals which result in intensity modulations and consequently in false T~2~ values even when the echo times are chosen to TE = n/J. Examinations on the calf muscles of healthy volunteers were performed to demonstrate this effect and its influence on in vivo T~2~ determinations. The T~2~ relaxation times evaluated with the Hahn spin‐echo in combination with a Helmholtz coil are far shorter than the true T~2~ values.

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