| Harris, Ashley D., Govindaraj, Mirthula and Frayne, Richard 2008. Minimum detectable difference of MR diffusion maps in acute ischemic stroke. Journal of Magnetic Resonance Imaging 27 (3) , pp. 629-633. 10.1002/jmri.21166 |
Abstract
To determine the minimum detectable difference (MDD) and investigate variability of region-of-interest (ROI) analysis of apparent diffusion coefficient (ADC) and fractional anisotropy (FA) in acute ischemic stroke. Materials and Methods Ten patients with acute stroke (<24 hours) and moderate-to-large infarcts were imaged using a fast diffusion tensor technique. Four observers repeated three trials, during which each of two ROI types (free-hand polygon and ellipse) were drawn in white and gray matter (WM and GM) on FA and ADC maps. Analysis-of-variance techniques examined tissue and ROI type effects as well as inter- and intraobserver variability. F-tests examined the variability differences between ROI types. Results The MDD for ADC was 0.160 × 10−3 mm2 s−1 in WM and 0.212 × 10−3 mm2 s−1 in GM. The FA MDD was 0.19 in WM and 0.10 in GM. Tissue but not ROI type affected the mean values for both ADC and FA maps. Intraobserver reliability was substantial, while interobserver reliability was poor-to-moderate. No variability differences were found by ROI types. Conclusion The MDD for WM and GM in normal and ischemic tissue were calculated. Inter- and intraobserver variability and tissue type affect ROI analysis of ADC and FA maps.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Psychology |
| Subjects: | B Philosophy. Psychology. Religion > BF Psychology R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry |
| Uncontrolled Keywords: | minimum detectable difference; variability; apparent diffusion coefficient; fractional anisotropy; ischemic stroke; diffusion-tensor imaging |
| Publisher: | John Wiley & Sons |
| ISSN: | 1053-1807 |
| Last Modified: | 10 Oct 2017 14:25 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/31315 |
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