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MR Imaging: Influence of Imaging Technique and Postprocessing on Measurement of Internal Carotid Artery Stenosis

MR Imaging: Influence of Imaging Technique and Postprocessing on Measurement of Internal Carotid... This Article Figures Only Full Text Full Text (PDF) All Versions of this Article: ajnr.A1179v1 29/9/1736 most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Runck, F. Articles by Lell, M.M. Search for Related Content PubMed PubMed Citation Articles by Runck, F. Articles by Lell, M.M. Hotlight (NEW!) What's Hotlight? American Journal of Neuroradiology 29:1736-1742, October 2008 © 2008 American Society of Neuroradiology HEAD & NECK MR Imaging: Influence of Imaging Technique and Postprocessing on Measurement of Internal Carotid Artery Stenosis F. Runck a ,c , R.P. Steiner b , W.A. Bautz c and M.M. Lell c a Department of Radiology and Neuroradiology, Klinikum Augsburg, Augsburg, Germany b Department of Sports and Rehabilitation Medicine, University of Ulm, Ulm, Germany c Institute of Radiology, University Erlangen-Nuremberg, Erlangen, Germany Please address correspondence to Frank Runck, MD, Klinikum Augsburg/Department of Radiology and Neuroradiology, Stenglinstr 2, 86156 Augsburg, Germany; e-mail: frank.runck@klinikum-augsburg.de BACKGROUND AND PURPOSE: MR angiography (MRA) is increasingly used as an alternative to digital subtraction angiography (DSA) to evaluate internal carotid artery (ICA) stenosis. Because MRA is not standardized in data acquisition and postprocessing, we sought to evaluate the effects of different acquisition techniques (time-of-flight MRA TOF-MRA) and contrast-enhanced MRA CE-MRA) and postprocessing methods (maximum intensity projection MIP, multiplanar reformation MPR, and volume-rendering on stenosis grading. MATERIALS AND METHODS: Fifty patients (33 men, 17 women) with symptomatic ICA stenosis were examined at 1.5T. Two imaging techniques and 3 postprocessing methods resulted in 6 image datasets per patient. Two readers independently evaluated ICA stenosis according to the North American Symptomatic Carotid Endarterectomy Trial criteria. Interobserver variability was calculated with the Pearson correlation coefficient and simultaneous confidence intervals (CI). The relationship of the values of ICA stenosis between the techniques was assessed by means of simultaneous 95% Tukey CI. RESULTS: Interobserver agreement was high. Higher concordance was found for postprocessing techniques with TOF- than with CE-MRA; the mean difference between TOF-MPR and TOF-MIP was 0.4% (95% CI, –2.9%–3.8%). Stenosis values for CE-MPR differed significantly from those of CE volume-rendering (7.2%; 95% CI, 3.9%–10.6%). CONCLUSION: Stenosis grading was found to be independent of the postprocessing technique except for comparison of CE-MPR with CE volume-rendering, with the volume-rendering technique resulting in higher stenosis values. MPR seems to be best-suited for measurement of ICA stenosis. Parameter setting is critical with volume-rendering, in which stenosis values were consistently higher compared with the other methods. This article has been cited by other articles: L.S. Babiarz, J.M. Romero, E.K. Murphy, B. Brobeck, P.W. Schaefer, R.G. Gonzalez, and M.H. Lev Contrast-Enhanced MR Angiography Is Not More Accurate Than Unenhanced 2D Time-of-Flight MR Angiography for Determining >=70% Internal Carotid Artery Stenosis AJNR Am. J. Neuroradiol., April 1, 2009; 30(4): 761 - 768. Abstract Full Text PDF Home Subscribe Author Instructions Submit Online Search the AJNR Archives Feedback Help Copyright © 2010 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png American Journal of Neuroradiology American Journal of Neuroradiology

MR Imaging: Influence of Imaging Technique and Postprocessing on Measurement of Internal Carotid Artery Stenosis

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References (42)

Publisher
American Journal of Neuroradiology
Copyright
Copyright © 2010 by the American Society of Neuroradiology.
ISSN
0195-6108
eISSN
1936-959X
DOI
10.3174/ajnr.A1179
Publisher site
See Article on Publisher Site

Abstract

This Article Figures Only Full Text Full Text (PDF) All Versions of this Article: ajnr.A1179v1 29/9/1736 most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Runck, F. Articles by Lell, M.M. Search for Related Content PubMed PubMed Citation Articles by Runck, F. Articles by Lell, M.M. Hotlight (NEW!) What's Hotlight? American Journal of Neuroradiology 29:1736-1742, October 2008 © 2008 American Society of Neuroradiology HEAD & NECK MR Imaging: Influence of Imaging Technique and Postprocessing on Measurement of Internal Carotid Artery Stenosis F. Runck a ,c , R.P. Steiner b , W.A. Bautz c and M.M. Lell c a Department of Radiology and Neuroradiology, Klinikum Augsburg, Augsburg, Germany b Department of Sports and Rehabilitation Medicine, University of Ulm, Ulm, Germany c Institute of Radiology, University Erlangen-Nuremberg, Erlangen, Germany Please address correspondence to Frank Runck, MD, Klinikum Augsburg/Department of Radiology and Neuroradiology, Stenglinstr 2, 86156 Augsburg, Germany; e-mail: frank.runck@klinikum-augsburg.de BACKGROUND AND PURPOSE: MR angiography (MRA) is increasingly used as an alternative to digital subtraction angiography (DSA) to evaluate internal carotid artery (ICA) stenosis. Because MRA is not standardized in data acquisition and postprocessing, we sought to evaluate the effects of different acquisition techniques (time-of-flight MRA TOF-MRA) and contrast-enhanced MRA CE-MRA) and postprocessing methods (maximum intensity projection MIP, multiplanar reformation MPR, and volume-rendering on stenosis grading. MATERIALS AND METHODS: Fifty patients (33 men, 17 women) with symptomatic ICA stenosis were examined at 1.5T. Two imaging techniques and 3 postprocessing methods resulted in 6 image datasets per patient. Two readers independently evaluated ICA stenosis according to the North American Symptomatic Carotid Endarterectomy Trial criteria. Interobserver variability was calculated with the Pearson correlation coefficient and simultaneous confidence intervals (CI). The relationship of the values of ICA stenosis between the techniques was assessed by means of simultaneous 95% Tukey CI. RESULTS: Interobserver agreement was high. Higher concordance was found for postprocessing techniques with TOF- than with CE-MRA; the mean difference between TOF-MPR and TOF-MIP was 0.4% (95% CI, –2.9%–3.8%). Stenosis values for CE-MPR differed significantly from those of CE volume-rendering (7.2%; 95% CI, 3.9%–10.6%). CONCLUSION: Stenosis grading was found to be independent of the postprocessing technique except for comparison of CE-MPR with CE volume-rendering, with the volume-rendering technique resulting in higher stenosis values. MPR seems to be best-suited for measurement of ICA stenosis. Parameter setting is critical with volume-rendering, in which stenosis values were consistently higher compared with the other methods. This article has been cited by other articles: L.S. Babiarz, J.M. Romero, E.K. Murphy, B. Brobeck, P.W. Schaefer, R.G. Gonzalez, and M.H. Lev Contrast-Enhanced MR Angiography Is Not More Accurate Than Unenhanced 2D Time-of-Flight MR Angiography for Determining >=70% Internal Carotid Artery Stenosis AJNR Am. J. Neuroradiol., April 1, 2009; 30(4): 761 - 768. Abstract Full Text PDF Home Subscribe Author Instructions Submit Online Search the AJNR Archives Feedback Help Copyright © 2010 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X

Journal

American Journal of NeuroradiologyAmerican Journal of Neuroradiology

Published: Oct 1, 2008

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