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Erratum to Helms, Dathe, and Dechent. Quantitative FLASH MRI at 3 tesla using a rational approximation of the ernst equation. Magn Reson Med 2008;59:667–672.

✍ Scribed by Gunther Helms; Henning Dathe; Peter Dechent

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 29 KB
Volume: 63
Category: Article
ISSN: 0740-3194
DOI: 10.1002/mrm.22293

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✦ Synopsis

Due to an unauthorized modification of the proofs, Eq. 9b has been incorrectly rendered in the published issue. The equation states the signal amplitude, A app in arbitrary units, as calculated from two FLASH signals S 1 and S 2 measured at flip angles a 1 and a 2 , respectively, in units of radians. The correct equation reads

This can be easily verified by comparison to Eq. 9a. Both equations must have the identical numerators since they are derived from Eqs. 5a,b.

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✍ Gunther Helms; Henning Dathe; Peter Dechent 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 456 KB

## Abstract From the half‐angle substitution of trigonometric terms in the Ernst equation, rational approximations of the flip angle dependence of the FLASH signal can be derived. Even the rational function of the lowest order was in good agreement with the experiment for flip angles up to 20°. Thr