Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.

<h4>Purpose</h4>To evaluate how often delayed images, obtained during neurovascular CTA, provide unique information relative to early phase imaging alone.<h4>Materials and methods</h4>Informed consent was waived by the institutional review body for this study. Neurovascular C...

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Autores principales:	Debbie L Bennett, Leena M Hamberg, Bing Wang, Joshua A Hirsch, R Gilberto González, George J Hunter
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e3570ab902964626bfd8fb7df31dd964
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spelling	oai:doaj.org-article:e3570ab902964626bfd8fb7df31dd9642021-11-18T08:16:50ZDiagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.1932-620310.1371/journal.pone.0099020https://doaj.org/article/e3570ab902964626bfd8fb7df31dd9642014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24905932/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Purpose</h4>To evaluate how often delayed images, obtained during neurovascular CTA, provide unique information relative to early phase imaging alone.<h4>Materials and methods</h4>Informed consent was waived by the institutional review body for this study. Neurovascular CTAs from January through June 2009 were searched to identify those with delayed phase imaging. Reports were reviewed to identify cases where delayed images provided potentially unique information. The studies with potentially unique information were re-interpreted to determine if the information was indeed unique.<h4>Results</h4>645 CTAs with delayed phase imaging were identified. There were 324 men and 310 women (median age 67 years; range 20-96 years). 59 studies (59/645: 9.1%) had findings on the delayed images. There were 13 cases with hemorrhage, with 4 showing progression on delayed views. Of the remaining 46 cases, 28 had occlusion of a vessel that did not reconstitute on the delayed images, 6 had occlusion of a vessel that did reconstitute on the delayed images, 7 had a string sign which was unchanged on the delayed views and 5 had no abnormal findings. Thus in 10 cases the findings were unique to the delayed images (10/645: 1.55%). Four showed active bleeding, three showed proximal occlusion with distal internal carotid filling from ophthalmic collaterals, two showed pial vessels filling distal to proximal MCA occlusion, and one showed retrograde vertebral artery filling due to subclavian steal. 95% confidence limits of the expected incidence of unique information from the delayed phase images are 0.6%-2.5%.<h4>Conclusion</h4>Obtaining delayed phase imaging for neurovascular CTA should be an active decision and not the default protocol. This avoids imaging with little, if any value. If delayed images had not been obtained in our cohort, no detriment in patient management would have occurred.Debbie L BennettLeena M HambergBing WangJoshua A HirschR Gilberto GonzálezGeorge J HunterPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 6, p e99020 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Debbie L Bennett Leena M Hamberg Bing Wang Joshua A Hirsch R Gilberto González George J Hunter Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.
description	<h4>Purpose</h4>To evaluate how often delayed images, obtained during neurovascular CTA, provide unique information relative to early phase imaging alone.<h4>Materials and methods</h4>Informed consent was waived by the institutional review body for this study. Neurovascular CTAs from January through June 2009 were searched to identify those with delayed phase imaging. Reports were reviewed to identify cases where delayed images provided potentially unique information. The studies with potentially unique information were re-interpreted to determine if the information was indeed unique.<h4>Results</h4>645 CTAs with delayed phase imaging were identified. There were 324 men and 310 women (median age 67 years; range 20-96 years). 59 studies (59/645: 9.1%) had findings on the delayed images. There were 13 cases with hemorrhage, with 4 showing progression on delayed views. Of the remaining 46 cases, 28 had occlusion of a vessel that did not reconstitute on the delayed images, 6 had occlusion of a vessel that did reconstitute on the delayed images, 7 had a string sign which was unchanged on the delayed views and 5 had no abnormal findings. Thus in 10 cases the findings were unique to the delayed images (10/645: 1.55%). Four showed active bleeding, three showed proximal occlusion with distal internal carotid filling from ophthalmic collaterals, two showed pial vessels filling distal to proximal MCA occlusion, and one showed retrograde vertebral artery filling due to subclavian steal. 95% confidence limits of the expected incidence of unique information from the delayed phase images are 0.6%-2.5%.<h4>Conclusion</h4>Obtaining delayed phase imaging for neurovascular CTA should be an active decision and not the default protocol. This avoids imaging with little, if any value. If delayed images had not been obtained in our cohort, no detriment in patient management would have occurred.
format	article
author	Debbie L Bennett Leena M Hamberg Bing Wang Joshua A Hirsch R Gilberto González George J Hunter
author_facet	Debbie L Bennett Leena M Hamberg Bing Wang Joshua A Hirsch R Gilberto González George J Hunter
author_sort	Debbie L Bennett
title	Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.
title_short	Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.
title_full	Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.
title_fullStr	Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.
title_full_unstemmed	Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.
title_sort	diagnostic yield of delayed phase imaging in ct angiography of the head and neck: a retrospective study.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/e3570ab902964626bfd8fb7df31dd964
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Diagnostic yield of delayed phase imaging in CT angiography of the head and neck: a retrospective study.

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