Differentiation of the infarct core from ischemic penumbra within the first 4.5 hours, using diffusion tensor imaging-derived metrics: A rat model

Duen Pang Kuo, Chia Feng Lu, Michelle Liou, Yung Chieh Chen, Hsiao Wen Chung, Cheng Yu Chen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Objective: To investigate whether the diffusion tensor imaging-derived metrics are capable of differentiating the ischemic penumbra (IP) from the infarct core (IC), and determining stroke onset within the first 4.5 hours. Materials and Methods: All procedures were approved by the local animal care committee. Eight of the eleven rats having permanent middle cerebral artery occlusion were included for analyses. Using a 7 tesla magnetic resonance system, the relative cerebral blood flow and apparent diffusion coefficient maps were generated to define IP and IC, half hour after surgery and then every hour, up to 6.5 hours. Relative fractional anisotropy, pure anisotropy (rq) and diffusion magnitude (rL) maps were obtained. One-way analysis of variance, receiver operating characteristic curve and nonlinear regression analyses were performed. Results: The evolutions of tensor metrics were different in ischemic regions (IC and IP) and topographic subtypes (cortical, subcortical gray matter, and white matter). The rL had a significant drop of 40% at 0.5 hour, and remained stagnant up to 6.5 hours. Significant differences (p < 0.05) in rL values were found between IP, IC, and normal tissue for all topographic subtypes. Optimal rL threshold in discriminating IP from IC was about -29%. The evolution of rq showed an exponential decrease in cortical IC, from -26.9% to -47.6%; an rq reduction smaller than 44.6% can be used to predict an acute stroke onset in less than 4.5 hours. Conclusion: Diffusion tensor metrics may potentially help discriminate IP from IC and determine the acute stroke age within the therapeutic time window.

Original languageEnglish
Pages (from-to)269-278
Number of pages10
JournalKorean Journal of Radiology
Volume18
Issue number2
DOIs
Publication statusPublished - Mar 1 2017

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Diffusion Tensor Imaging
Stroke
Anisotropy
Cerebrovascular Circulation
Animal Care Committees
Middle Cerebral Artery Infarction
ROC Curve
Analysis of Variance
Magnetic Resonance Spectroscopy
Regression Analysis
Therapeutics

Keywords

  • Diffusion magnitude
  • Diffusion tensor imaging
  • Infarct core
  • Ischemic penumbra
  • Pure anisotropy

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Differentiation of the infarct core from ischemic penumbra within the first 4.5 hours, using diffusion tensor imaging-derived metrics : A rat model. / Kuo, Duen Pang; Lu, Chia Feng; Liou, Michelle; Chen, Yung Chieh; Chung, Hsiao Wen; Chen, Cheng Yu.

In: Korean Journal of Radiology, Vol. 18, No. 2, 01.03.2017, p. 269-278.

Research output: Contribution to journalArticle

Kuo, Duen Pang ; Lu, Chia Feng ; Liou, Michelle ; Chen, Yung Chieh ; Chung, Hsiao Wen ; Chen, Cheng Yu. / Differentiation of the infarct core from ischemic penumbra within the first 4.5 hours, using diffusion tensor imaging-derived metrics : A rat model. In: Korean Journal of Radiology. 2017 ; Vol. 18, No. 2. pp. 269-278.
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