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Rapid acquisition strategy for functional T1ρ mapping of the brain.

Abstract：

:Functional T1ρ mapping has been proposed as a method to assess pH and metabolism dynamics in the brain with high spatial and temporal resolution. The purpose of this work is to describe and evaluate a variant of the spin-locked echo-planar imaging sequence for functional T1ρ mapping at 3T. The proposed sequence rapidly acquires a time series of T1ρ maps with 4.0second temporal resolution and 10 slices of volumetric coverage. Simulation, phantom, and in vivo experiments are used to evaluate many aspects of the sequence and its implementation including fidelity of measured T1ρ dynamics, potential confounds to the T1ρ response, imaging parameter tradeoffs, time series analysis approaches, and differences compared to blood oxygen level dependent functional magnetic resonance imaging. It is shown that the high temporal resolution and volumetric coverage of the sequence are obtained with some expense including underestimation of the T1ρ response, sensitivity to T1 dynamics, and reduced signal-to-noise ratio. In vivo studies using a flashing checkerboard functional magnetic resonance imaging paradigm suggest differences between T1ρ and blood oxygen level dependent activation patterns. Possible sources of the functional T1ρ response and potential sequence improvements are discussed. The capability of T1ρ to map whole-brain pH and metabolism dynamics with high temporal and spatial resolution is potentially unique and warrants further investigation and development.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Johnson CP,Heo HY,Thedens DR,Wemmie JA,Magnotta VA

doi

10.1016/j.mri.2014.07.010

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

1067-77

issue

9

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(14)00213-6

journal_volume

32

pub_type

杂志文章

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