{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T00:34:34Z","timestamp":1777509274031,"version":"3.51.4"},"reference-count":21,"publisher":"SAGE Publications","issue":"12","license":[{"start":{"date-parts":[[2024,11,5]],"date-time":"2024-11-05T00:00:00Z","timestamp":1730764800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Acta Radiol"],"published-print":{"date-parts":[[2024,12]]},"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Double-concentration magnetic resonance imaging (MRI) contrast agents are frequently used in contrast-enhanced MR angiography (CE-MRA) of the head and neck. To avoid mistiming the peak concentration of intraluminal contrast (due to shorter duration of peak), a second acquisition is sometimes performed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To evaluate additional information from the second acquisition of CE-MRA and compare the collateral scoring to the hypoperfusion index obtained on MR perfusion, and to investigate presence of pseudo-occlusion using the second phase of CE-MRA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Material and Methods<\/jats:title>\n                    <jats:p>A retrospective study was conducted. CE-MRA of the brain\/neck, dynamic susceptibility contrast (DSC) MR perfusion scan (in majority) and subsequent digital subtraction angiography (DSA) were evaluated in patients with previous acute internal carotid artery (ICA)\/middle cerebral artery (MCA) occlusion. Evaluation of CE-MRA\/MR perfusion and DSA was performed by three experienced neuroradiologists and one neurointerventionist, respectively.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The site of ICA occlusion was seen to be distal to the site noted on early arterial phase (pseudo-occlusion of ICA) in 28.5% of patients. A significant negative correlation was seen between a higher HIR and collateral score.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Evaluation of second phase CE-MRA can provide valuable information that may be otherwise lost if only the early arterial phase is evaluated.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/02841851241290728","type":"journal-article","created":{"date-parts":[[2024,11,6]],"date-time":"2024-11-06T01:50:56Z","timestamp":1730857856000},"page":"1540-1547","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Can the second phase of contrast-enhanced MRA of the neck provide additional information in the acute stroke setting?"],"prefix":"10.1177","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5327-2398","authenticated-orcid":false,"given":"P","family":"Shah","sequence":"first","affiliation":[{"name":"Department of Radiology, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"H","family":"Kale","sequence":"additional","affiliation":[{"name":"Department of Radiology, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M","family":"Shrivastava","sequence":"additional","affiliation":[{"name":"Department of Radiology, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D","family":"Sanghvi","sequence":"additional","affiliation":[{"name":"Department of Radiology, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M","family":"Munshi","sequence":"additional","affiliation":[{"name":"Department of Radiology, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"G","family":"Sangani","sequence":"additional","affiliation":[{"name":"Department of Radiology, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7976-2782","authenticated-orcid":false,"given":"K","family":"Mundada","sequence":"additional","affiliation":[{"name":"Department of Radiology, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, 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