{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,21]],"date-time":"2025-10-21T14:57:19Z","timestamp":1761058639592},"reference-count":39,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2005,11,22]],"date-time":"2005-11-22T00:00:00Z","timestamp":1132617600000},"content-version":"vor","delay-in-days":4527,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Magnetic Resonance Imaging"],"published-print":{"date-parts":[[1993,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The velocity\u2010phase relationship intrinsic to phase\u2010contrast magnetic resonance (MR) angiography permits the quantitative and qualitative assessment of blood flow. The ability to measure velocity and vessel cross\u2010sectional area allows noninvasive assessment of volume flow rate (VFR) in the internal carotid artery (ICA). Phase\u2010contrast techniques also demonstrate flow direction. Using two\u2010dimensional cine phase\u2010contrast angiography, the authors evaluated VFR in the ICA and collateral flow about the circle of Willis in 15 patients with ischemic neurologic symptoms. The VFR in each carotid artery was correlated with the degree of stenosis and presence or absence of abnormal circle of Willis collateral flow. There was a correlation between a decrease in VFR and abnormal circle of Willis collateral flow. In addition, a correlation between severe stenosis and a decrease in VFR was found. In patients with ischemic neurologic symptoms without severe stenosis (&lt;70% diameter stenosis), no decrease in VFR was seen. It is hoped that flow quantification and directional flow imaging with phase\u2010contrast angiography will help further characterize carotid artery occlusive disease by enabling assessment of VFR changes associated with ischemic neurologic symptoms. This study also supports the hypothesis that two mechanisms\u2010hemodynamic and embolic\u2010play a role in ischemic neurologic symptoms.<\/jats:p>","DOI":"10.1002\/jmri.1880030409","type":"journal-article","created":{"date-parts":[[2007,3,6]],"date-time":"2007-03-06T02:37:48Z","timestamp":1173148668000},"page":"603-609","source":"Crossref","is-referenced-by-count":13,"title":["Correlation of cine MR velocity measurements in the internal carotid artery with collateral flow in the circle of willis: Preliminary study"],"prefix":"10.1002","volume":"3","author":[{"given":"Wayne L.","family":"Davis","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patrick A.","family":"Turski","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kristina 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