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Influence of fluid-attenuated inversion-recovery on stroke apparent diffusion coefficient measurements and its clinical application.

Abstract：

BACKGROUND AND PURPOSE:The application of a fluid-attenuated inversion-recovery pulse with a conventional diffusion-weighted MRI sequence (FLAIR DWI) decreases the partial volume effects from cerebrospinal fluid on apparent diffusion coefficient (ADC) measurements. For this reason, FLAIR DWI may be more useful in the evaluation of ischemic stroke, but few studies have looked at the effect of FLAIR on ADC measurements in this setting. This study quantitatively compares FLAIR DWI and conventional DWI in ischemic stroke of varying ages to assess the potential advantages of this technique. METHODS:We respectively analyzed 139 DWI studies in patients with ischemic stroke with and without FLAIR at varying time points ranging from hyperacute to chronic. ADC values were measured in each lesion, as well as in the contralateral normal side. Comparisons were made between the ADC values obtained from the DWI sequences with and without FLAIR for both the lesion and the normal contralateral side. RESULTS:The ADC measurements within the ischemic lesion were very similar on FLAIR DWI and conventional DWI for lesions less than 14 days old (p>0.05), but were significantly decreased on FLAIR DWI for lesions between 15 and 30 days old and in lesions >31 days old (chronic stage) (p<0.01). The contralateral ADC values were all significantly decreased on the FLAIR DWI sequence compared with conventional DWI (p<0.01). CONCLUSIONS:The application of an inversion pulse does not significantly affect the ADC values for early stage ischemic stroke (less than 14 days from symptom onset), but results in a more accurate relative ADC measurement by reducing the cerebrospinal fluid partial volume effects of the normal contralateral side. In addition, combined with the conventional DWI, FLAIR DWI may be helpful in determining the age of ischemic lesions.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Ni JM,Mogensen MA,Chen ZA,Shuang C,Shen TZ,Huang G

doi

10.1016/j.ejrad.2009.11.029

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

e76-81

issue

2

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(09)00660-3

journal_volume

75

pub_type

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