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Reproducibility Analysis of a New Objective Method for Measuring Arteriovenous Malformation Nidus Size at Angiography

Reproducibility Analysis of a New Objective Method for Measuring Arteriovenous Malformation Nidus... This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted 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 Imbesi, S. G. Articles by Kerber, C. W. Search for Related Content PubMed PubMed Citation Articles by Imbesi, S. G. Articles by Kerber, C. W. Hotlight (NEW!) What's Hotlight? American Journal of Neuroradiology 23:412-415, March 2002 © 2002 American Society of Neuroradiology INTERVENTIONAL Reproducibility Analysis of a New Objective Method for Measuring Arteriovenous Malformation Nidus Size at Angiography Steven G. Imbesi a , Kimberly Knox a and Charles W. Kerber a a From the Department of Radiology (S.G.I., K.K., C.W.K.) and Neurosurgery (C.W.K.), University of California, San Diego Medical Center Address reprint requests to Steven G. Imbesi, Assistant Professor of Radiology, University of California, San Diego Medical Center, 200 West Arbor Drive, MC #8756, San Diego, CA 92103-8756 BACKGROUND AND PURPOSE: Currently, no specific method exists to measure arteriovenous malformation (AVM) nidus size, a requirement in assessing the success of treatment. Additionally, the commonly used evaluation provides only a linear one-dimensional measurement of this three-dimensional entity. The purpose of this study was to devise an improved method for measuring AVM nidus size, an irregularly shaped radiologic entity, that provides objective and reproducible results. METHODS: The procedure involved digitizing angiograms obtained before and after treatment, making the gray scale uniform, printing images on standard bond paper, delineating the nidus area, measuring the nidus area with a polar planimeter, and finally, correcting for geometric magnification. Three observers made the measurements. The corrected nidus areas were tabulated, and the mean, standard deviation, interobserver variability, and confidence intervals (CIs) were calculated. RESULTS: On both anteroposterior and lateral views, the Kendall coefficient of concordance (a measure of interobserver variability) was equal to 0.97, signifying excellent agreement. Additionally, these values were within the 95% CIs; this result showed that they were unlikely the result of chance. CONCLUSION: Precise measurements of an AVM nidus are required to properly analyze changes in the lesion after endovascular embolization (ie, to evaluate treatment success). Because of the irregular contours of an AVM nidus, measuring an area with planimetry, rather than with the usual linear dimensions, should yield more exact results. This article has been cited by other articles: S. S. Joseffer, P. P. Huang, and P. K. Nelson Simultaneous Dual Vessel Cerebral Angiography in Gamma Knife Planning AJNR Am. J. Neuroradiol., February 1, 2003; 24(2): 271 - 274. Abstract Full Text PDF R. Al-Shahi, N. Pal, S. C. Lewis, J. J. Bhattacharya, R. J. Sellar, C. P. Warlow, A. X. Halim, W. L. Young, and S. C. Johnston Observer Agreement in the Angiographic Assessment of Arteriovenous Malformations of the Brain * Editorial Comment Stroke, June 1, 2002; 33(6): 1501 - 1508. 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

Reproducibility Analysis of a New Objective Method for Measuring Arteriovenous Malformation Nidus Size at Angiography

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

Abstract

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted 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 Imbesi, S. G. Articles by Kerber, C. W. Search for Related Content PubMed PubMed Citation Articles by Imbesi, S. G. Articles by Kerber, C. W. Hotlight (NEW!) What's Hotlight? American Journal of Neuroradiology 23:412-415, March 2002 © 2002 American Society of Neuroradiology INTERVENTIONAL Reproducibility Analysis of a New Objective Method for Measuring Arteriovenous Malformation Nidus Size at Angiography Steven G. Imbesi a , Kimberly Knox a and Charles W. Kerber a a From the Department of Radiology (S.G.I., K.K., C.W.K.) and Neurosurgery (C.W.K.), University of California, San Diego Medical Center Address reprint requests to Steven G. Imbesi, Assistant Professor of Radiology, University of California, San Diego Medical Center, 200 West Arbor Drive, MC #8756, San Diego, CA 92103-8756 BACKGROUND AND PURPOSE: Currently, no specific method exists to measure arteriovenous malformation (AVM) nidus size, a requirement in assessing the success of treatment. Additionally, the commonly used evaluation provides only a linear one-dimensional measurement of this three-dimensional entity. The purpose of this study was to devise an improved method for measuring AVM nidus size, an irregularly shaped radiologic entity, that provides objective and reproducible results. METHODS: The procedure involved digitizing angiograms obtained before and after treatment, making the gray scale uniform, printing images on standard bond paper, delineating the nidus area, measuring the nidus area with a polar planimeter, and finally, correcting for geometric magnification. Three observers made the measurements. The corrected nidus areas were tabulated, and the mean, standard deviation, interobserver variability, and confidence intervals (CIs) were calculated. RESULTS: On both anteroposterior and lateral views, the Kendall coefficient of concordance (a measure of interobserver variability) was equal to 0.97, signifying excellent agreement. Additionally, these values were within the 95% CIs; this result showed that they were unlikely the result of chance. CONCLUSION: Precise measurements of an AVM nidus are required to properly analyze changes in the lesion after endovascular embolization (ie, to evaluate treatment success). Because of the irregular contours of an AVM nidus, measuring an area with planimetry, rather than with the usual linear dimensions, should yield more exact results. This article has been cited by other articles: S. S. Joseffer, P. P. Huang, and P. K. Nelson Simultaneous Dual Vessel Cerebral Angiography in Gamma Knife Planning AJNR Am. J. Neuroradiol., February 1, 2003; 24(2): 271 - 274. Abstract Full Text PDF R. Al-Shahi, N. Pal, S. C. Lewis, J. J. Bhattacharya, R. J. Sellar, C. P. Warlow, A. X. Halim, W. L. Young, and S. C. Johnston Observer Agreement in the Angiographic Assessment of Arteriovenous Malformations of the Brain * Editorial Comment Stroke, June 1, 2002; 33(6): 1501 - 1508. 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: Mar 1, 2002

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