Measurement of T1 of the Ultrashort T2* Components in White Matter of the Brain at 3T

Jiang Du, Vipul Sheth, Qun He, Michael Carl, Jun Chen, Jody Corey-Bloom and Graeme M Bydder

PLOS ONE, 2014, vol. 9, issue 8, 1-8

Abstract: Recent research demonstrates that white matter of the brain contains not only long T2 components, but a minority of ultrashort T2* components. Adiabatic inversion recovery prepared dual echo ultrashort echo time (IR-dUTE) sequences can be used to selectively image the ultrashort T2* components in white matter of the brain using a clinical whole body scanner. The T2*s of the ultrashort T2* components can be quantified using mono-exponential decay fitting of the IR-dUTE signal at a series of different TEs. However, accurate T1 measurement of the ultrashort T2* components is technically challenging. Efficient suppression of the signal from the majority of long T2 components is essential for robust T1 measurement. In this paper we describe a novel approach to this problem based on the use of IR-dUTE data acquisitions with different TR and TI combinations to selectively detect the signal recovery of the ultrashort T2* components. Exponential recovery curve fitting provides efficient T1 estimation, with minimized contamination from the majority of long T2 components. A rubber phantom and a piece of bovine cortical bone were used for validation of this approach. Six healthy volunteers were studied. An averaged T2* of 0.32±0.09 ms, and a short mean T1 of 226±46 ms were demonstrated for the healthy volunteers at 3T.

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0103296

DOI: 10.1371/journal.pone.0103296

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