{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T12:05:44Z","timestamp":1792670744171,"version":"4.5.0"},"reference-count":51,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2014,8,28]],"date-time":"2014-08-28T00:00:00Z","timestamp":1409184000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Magnetic Resonance in Med"],"published-print":{"date-parts":[[2014,11]]},"abstract":"<jats:sec><jats:title>Purpose<\/jats:title><jats:p>We investigated whether oscillating gradient diffusion MRI (dMRI) can provide information on brain microstructural changes after formaldehyde fixation and after hypoxic\u2010ischemic (HI) injury beyond that provided by conventional dMRI.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Pulsed gradient spin echo (PGSE) and oscillating gradient spin echo (OGSE) dMRI of the adult mouse brain was performed in vivo (50\u2013200 Hz, b\u2009=\u2009600 mm<jats:sup>2<\/jats:sup>\/s), and a similar protocol was applied to neonatal mouse brains at 24 h after unilateral hypoxia\u2010ischemia. Animals were perfusion fixed with 4% paraformaldehyde for ex vivo dMRI and histology.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Apparent diffusion coefficients (ADCs) measured in the live adult mouse brain presented tissue\u2010dependent frequency\u2010dependence. In vivo OGSE\u2010ADC maps at high oscillating frequencies (&gt;100 Hz) showed clear contrast between the molecular layer and granule cell layer in the adult mouse cerebellum. Formaldehyde fixation significantly altered the temporal diffusion spectra in several brain regions. In neonatal mouse brains with HI injury, in vivo ADC measurements from edema regions showed diminished edema contrasts at 200 Hz compared with the PGSE results. Histology showed severe tissue swelling and necrosis in the edema regions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The results demonstrate the unique ability of OGSE\u2010dMRI in delineating tissue microstructures at different spatial scales. Magn Reson Med 72:1366\u20131374, 2014. \u00a9 2014 Wiley Periodicals, Inc.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mrm.25441","type":"journal-article","created":{"date-parts":[[2014,8,28]],"date-time":"2014-08-28T15:31:58Z","timestamp":1409239918000},"page":"1366-1374","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":73,"title":["Oscillating gradient diffusion MRI reveals unique microstructural information in normal and hypoxia\u2010ischemia injured mouse brains"],"prefix":"10.1002","volume":"72","author":[{"given":"Dan","family":"Wu","sequence":"first","affiliation":[{"name":"Department of Biomedical Engineering Johns Hopkins University School of Medicine Baltimore Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lee J.","family":"Martin","sequence":"additional","affiliation":[{"name":"Department of Neuroscience Johns Hopkins University School of Medicine Baltimore Maryland 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