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Quantification of Carotid Stenosis on CT Angiography

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Quantification of Carotid Stenosis on CT Angiography Quantification of Carotid Stenosis on CT ORIGINAL RESEARCH Angiography E.S. Bartlett PURPOSE: Carotid artery stenosis quantification uses percent diameter ratios from conventional an- T.D. Walters giography. Multidetector high-speed CT angiography (CTA) allows direct millimeter measurement of carotid stenosis. We hypothesize a linear relationship between millimeter stenosis measurements and S.P. Symons derived percent, alleviating cumbersome ratio calculations. A.J. Fox METHODS: Two neuroradiologists separately reviewed CTAs of 268 carotid arteries, blinded to other information. The narrowest portion of each carotid stenosis was measured in millimeters from axial source images. Distal internal carotid arteries (ICAs) were measured beyond the bulb, where walls are parallel. North American Symptomatic Carotid Endarterectomy Trial (NASCET)–style ratios were cal- culated for each ICA, except for suspected near-occlusions. Interobserver agreement was calculated for all measurements. Correlation coefficients were calculated comparing millimeter and derived percent stenosis, followed by regression analysis. Sensitivity and specificity values tested validity. RESULTS: Interobserver agreement correlations were excellent, from 0.78 to 0.89 (2-tailed P Յ .01). Excellent reader correlation permitted averaging of millimeter stenosis and distal ICA measurements, which were then used to calculate mean percent stenosis. Stenosis assessment was confidently performed from source images even with calcification. Regression analysis of mean percent as a function of mean millimeter stenosis shows a linear relationship, correlating 1.3 mm to 70% and 2.2 mm to 50% NASCET-style stenosis (Pearson’s correlation of Ϫ0.95; n ϭ 136). Direct millimeter measurement defining severe stenosis (70% or greater) has sensitivity of 88.2%, specificity of 92.4%, and negative predicted value of 98.2%. CONCLUSION: There is a linear relationship between millimeter carotid stenosis diameter and derived percent stenosis. This allows prediction of NASCET-type percent from millimeter stenosis. urrent high-speed, multidetector CTA techniques allow sion.4,5 Endarterectomy confers some benefit for those with for direct evaluation and measurement of carotid lumen symptomatic 50%–69% stenosis, moderately reducing the C BRAIN diameter and the surrounding soft tissues. We show advan- risk of ipsilateral stroke.4,6 tages of quantifying carotid stenosis by direct millimeter mea- Both trials imaged carotid arteries by using conventional surements instead of by cumbersome ratio calculations. In angiography, first with conventional radiographic film and addition, we add clinical meaning to these millimeter mea- later with digital subtraction angiography (DSA). Methods of surements by showing their relationship to the well-known deriving percent stenosis ratios were adopted because stan- ORIGINAL RESEARCH North American Symptomatic Carotid Endarterectomy Trial dardized stenosis measurements were not consistent with film, (NASCET)–style ratio calculations. This relationship has im- and were impossible with DSA, because of differing degrees of portant implications regarding guidelines for revasculariza- magnification between imaging planes, film camera minification, tion procedures, specifically that of carotid endarterectomy. and lack of millimeter calibration of DSA equipment.7 The two largest randomized trials of carotid endarterec- Current clinical practice in North America continues to 1 tomy in newly symptomatic carotid stenosis are NASCET rely upon the guidelines from NASCET; however, less-inva- 2 and the European Carotid Surgery Trial (ECST). Both sive carotid imaging techniques, such as Doppler sonography showed significant benefits from carotid endarterectomy for and MR angiography, are now favored, despite being indirect severe degrees of stenosis. The measurement techniques used and less accurate than DSA.8-16 Acceptance of these alternate to derive percent stenosis, however, initially differed between modalities to quantify carotid artery stenosis is based upon the trials, resulting in differing incidence of stroke and revas- trials with comparison to DSA by using variable methods of cularization benefit due to a very different definition of 70% percentage stenosis calculation.5 Nonetheless, clinical de- stenosis. Efforts to reconcile the methodologic differences be- mands and advances in technology, including advances in CT tween the 2 studies have been undertaken for years.3 The angiography, have made a remarkable impact upon clinical NASCET data, combined with a re-evaluation of ECST cases practice and stroke research methods.17 by using the NASCET-style stenosis methods, showed that ca- CT angiography has evolved along with the technologic rotid endarterectomy is highly beneficial in symptomatic pa- advances of CT hardware and software. Modern CT angiogra- tients with 70% or greater stenosis, but without near-occlu- phy, performed with multidetector high-speed CT hardware Received December 14, 2004; accepted after revision November 1. and evaluated with 3D reformatting software, accurately and 12-16,18,19 From the Department of Neuroradiology (E.S.B.), Northwestern University, Chicago, IL; reliably depicts carotid disease, and allows for direct Department of Medical Imaging (S.P.S., A.J.F.), Sunnybrook and Women’s College Health quantification of carotid stenosis in millimeters. Sciences Centre, and the Department of Medicine (T.D.W.), Hospital for Sick Children, We hypothesize that direct millimeter measurements of University of Toronto, Toronto, Ontario, Canada. carotid bulb stenosis and derived percent ratios are related in a Address correspondence to Allan J. Fox, MD, Sunnybrook and Women’s College Hospital, University of Toronto, 2075 Bayview Ave, Room AG31b, Toronto, Ontario M4N 3M5, linear fashion. This relationship is expected, because stenosis Canada. diameter is part of the calculation of the percent stenosis ratio. AJNR Am J Neuroradiol 27:13–19 ͉ Jan 2006 ͉ www.ajnr.org 13 Fig 1. CTA showing right severe carotid bulb stenosis with deep plaque ulceration. A, Axial source image. B, Sagittal reformat. C, 3D rendered image (large arrow, stenotic ICA; dashed arrow, bulb plaque ulcer; small arrow, proximal ECA). Regression analysis can predict percent stenosis from any 4.5 mL/s, with a 17-second delay or the use of Smart Prep at the given direct millimeter measurement of stenosis. pulmonary artery. The use of millimeter stenosis measurements would obvi- CT technologists performed all the postprocessing multiplanar ate cumbersome ratio calculations while continuing to pro- reformats (MPRs) at the CT operator’s console. Coronal and sagittal vide important implications regarding treatment guidelines as MPR images were created as 10.0 mm thick, spaced by 3 mm. Bilateral 1 published in NASCET. Such relationship to the accepted rotational MPRs were created at the carotid bifurcations with a thick- NASCET-style ratios is necessary if millimeter stenosis values ness of 7 mm and spacing by 3 mm. 3D rendered images were created are incorporated into a useful clinical algorithm to determine on a GE Advantage workstation. All images were viewed on AGFA eligibility for carotid revascularization as concluded in Impax 4.5 PACS workstations (Fig 1). NASCET and the meta-analysis with ECST.1,2,4 Evaluation of Cases Materials and Methods CTA axial source images provide the most reliable measurements for stenosis when comparing CTA with DSA.12-16,18,19 Millimeter mea- Inclusion Criteria and Imaging surements were obtained by using the submillimeter measurement and Examinations were retrospectively collected from a single institu- magnification tools on the PACS workstation. Special attention was di- tion from August 2003 through March 2004, by using an AGFA Im- rected to some of the more densely calcified plaques, with extra window- pax 4.5 (Mortsel, Belgium) PACS data base. Examinations from con- ing and verification of findings from endarterectomy. secutive patients with the history of known or suspected carotid artery stenotic disease were entered into the study. Examinations were not Measurement of carotid stenosis was at the narrowest portion of included if the purpose of imaging was due to trauma, dissection, the carotid bulb on the axial source data (Fig 2). MPRs identified the vascular anomaly/malformation, tumor evaluation, or primary eval- carotid orientation to ensure true cross-sectional measurements. In- uation of the posterior circulation. Examinations were excluded be- ternal carotid arteries (ICAs) identified as passing oblique to the axial cause of inadequate coverage and/or technical errors precluding full plane were measured perpendicular to their own oblique carotid axis evaluation of the cervical carotid arteries. The study was approved by as seen on MPRs. These measurements were verified with measures the Sunnybrook and Women’s College Health Sciences Centre’s Re- from reformats to ensure accuracy in obtaining the narrowest diam- search Ethics Board (project identification number 411–2004). In- eter in a true cross-sectional plane (Fig 3). formed consent was not required for inclusion into this retrospective The distal ICA was measured well beyond the bulb where the walls are study and its evaluation of records and images. parallel and no longer tapering from the carotid bulb as per 5,7,20,21 All CTA examinations were performed by using a GE Medical NASCET. Distal external carotid artery (ECA) diameter was mea- Systems (Waukesha, Wisc) Lightspeed Plus 4-section
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