T1 measurements incorporating flip angle calibration and correction in vivo.

T1 measurements incorporating flip angle calibration and correction in vivo. Research Abstract Details 

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T1 measurements incorporating flip angle calibration and correction in vivo. Abstract Text:

Jinghua Wang,Maolin Qiu,Hyeonjin Kim,R Todd Constable,

In this work, we propose a variable FA method that combines in vivo flip angle (FA) calibration and correction with a short TR variable FA approach for a fast and accurate T(1) mapping. The precision T(1)s measured across a uniform milk phantom is estimated to be 2.65% using the conventional (slow) inversion recovery (IR) method and 28.5% for the variable FA method without FA correction, and 2.2% when FA correction is included. These results demonstrate that the sensitivity of the variable FA method to RF nonuniformities can be dramatically reduced when these nonuniformities are directly measured and corrected. The acquisition time for this approach decreases to 10 min from 85 min for the conventional IR method. In addition, we report that the averaged T(1)s measured from five normal subjects are 900 +/- 3 ms, 1337 +/- 8 ms and 2180 +/- 25 ms in white matter (WM), gray matter (GM) and cerebral spinal fluid (CSF) using the variable flip angle method with FA correction at 3 T, respectively. These results are consistent with previously reported values obtained with much longer acquisition times. The method reduces the total scan time for whole brain T(1) mapping, including FA measurement and calibration, to approximately 6 min. The novelty of this method lies in the in vivo calibration and the correction of the FAs, thereby allowing a rapid and accurate T(1) mapping at high field for many applications.

T1 measurements incorporating flip angle calibration and correction in vivo. Publishing Authors By Initials

J Wang,M Qiu,H Kim,RT Constable,

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T1 measurements incorporating flip angle calibration and correction in vivo. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Journal of magnetic resonance (San Diego, Calif. :

VOLUME: 182

Page Numbers: 283-92

Journal Abbreviation: J. Magn. Reson.

ISSN: 1090-7807

DAY: 27

MONTH: 07

YEAR: 2006

T1 measurements incorporating flip angle calibration and correction in vivo. Information

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LANGUAGE: eng

NlmUniqueID: 9707935

T1 measurements incorporating flip angle calibration and correction in vivo. Keywords Mesh Terms:

KEYWORDS: Phantoms, Imaging

MESH TERMS: methods

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Grant and Affiliation Information for T1 measurements incorporating flip angle calibration and correction in vivo.

AFFILIATION: Department of Diagnostic Radiology, Yale University School Medical Center, The Anlyan Center, 330 Cedar Street, P.O. Box 208042, New Haven, CT 06520-8042, USA. Jinghua.wang@yale.edu

Country: United States

AGENCY: United States NINDS

GRANT: NS40497

ACRONYM: NS

MEDLINETA: J Magn Reson

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