Standardized Volume Rendering for Magnetic Resonance Angiography Measurements in the Abdominal Aorta

Purpose: To compare three methods for standardizing volume rendering technique (VRT) protocols by studying aortic diameter measurements in magnetic resonance angiography (MRA) datasets. Material and Methods: Datasets from 20 patients previously examined with gadolinium-enhanced MRA and with digital...

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Veröffentlicht in:Acta radiologica (1987) 2006-03, Vol.47 (2), p.172-178
Hauptverfasser: Persson, A., Brismar, T. B., Lundström, C., Dahlström, N., Othberg, F., Smedby, Ö.
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container_end_page 178
container_issue 2
container_start_page 172
container_title Acta radiologica (1987)
container_volume 47
creator Persson, A.
Brismar, T. B.
Lundström, C.
Dahlström, N.
Othberg, F.
Smedby, Ö.
description Purpose: To compare three methods for standardizing volume rendering technique (VRT) protocols by studying aortic diameter measurements in magnetic resonance angiography (MRA) datasets. Material and Methods: Datasets from 20 patients previously examined with gadolinium-enhanced MRA and with digital subtraction angiography (DSA) for abdominal aortic aneurysm were retrospectively evaluated by three independent readers. The MRA datasets were viewed using VRT with three different standardized transfer functions: the percentile method (Pc-VRT), the maximum-likelihood method (ML-VRT), and the partial range histogram method (PRH-VRT). The aortic diameters obtained with these three methods were compared with freely chosen VRT parameters (F-VRT) and with maximum intensity projection (MIP) concerning inter-reader variability and agreement with the reference method DSA. Results: F-VRT parameters and PRH-VRT gave significantly higher diameter values than DSA, whereas Pc-VRT gave significantly lower values than DSA. The highest interobserver variability was found for F-VRT parameters and MIP, and the lowest for Pc-VRT and PRH-VRT. All standardized VRT methods were significantly superior to both MIP and F-VRT in this respect. The agreement with DSA was best for PRH-VRT, which was the only method with a mean error below 1 mm and which also had the narrowest limits of agreement (95% of cases between 2.1 mm below and 3.1 mm above DSA). Conclusion: All the standardized VRT methods compare favorably with MIP and VRT with freely selected parameters as regards interobserver variability. The partial range histogram method, although systematically overestimating vessel diameters, gives results closest to those of DSA.
doi_str_mv 10.1080/02841850500445298
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B. ; Lundström, C. ; Dahlström, N. ; Othberg, F. ; Smedby, Ö.</creator><creatorcontrib>Persson, A. ; Brismar, T. B. ; Lundström, C. ; Dahlström, N. ; Othberg, F. ; Smedby, Ö.</creatorcontrib><description>Purpose: To compare three methods for standardizing volume rendering technique (VRT) protocols by studying aortic diameter measurements in magnetic resonance angiography (MRA) datasets. Material and Methods: Datasets from 20 patients previously examined with gadolinium-enhanced MRA and with digital subtraction angiography (DSA) for abdominal aortic aneurysm were retrospectively evaluated by three independent readers. The MRA datasets were viewed using VRT with three different standardized transfer functions: the percentile method (Pc-VRT), the maximum-likelihood method (ML-VRT), and the partial range histogram method (PRH-VRT). The aortic diameters obtained with these three methods were compared with freely chosen VRT parameters (F-VRT) and with maximum intensity projection (MIP) concerning inter-reader variability and agreement with the reference method DSA. Results: F-VRT parameters and PRH-VRT gave significantly higher diameter values than DSA, whereas Pc-VRT gave significantly lower values than DSA. The highest interobserver variability was found for F-VRT parameters and MIP, and the lowest for Pc-VRT and PRH-VRT. All standardized VRT methods were significantly superior to both MIP and F-VRT in this respect. The agreement with DSA was best for PRH-VRT, which was the only method with a mean error below 1 mm and which also had the narrowest limits of agreement (95% of cases between 2.1 mm below and 3.1 mm above DSA). Conclusion: All the standardized VRT methods compare favorably with MIP and VRT with freely selected parameters as regards interobserver variability. 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B.</creatorcontrib><creatorcontrib>Lundström, C.</creatorcontrib><creatorcontrib>Dahlström, N.</creatorcontrib><creatorcontrib>Othberg, F.</creatorcontrib><creatorcontrib>Smedby, Ö.</creatorcontrib><title>Standardized Volume Rendering for Magnetic Resonance Angiography Measurements in the Abdominal Aorta</title><title>Acta radiologica (1987)</title><addtitle>Acta Radiol</addtitle><description>Purpose: To compare three methods for standardizing volume rendering technique (VRT) protocols by studying aortic diameter measurements in magnetic resonance angiography (MRA) datasets. Material and Methods: Datasets from 20 patients previously examined with gadolinium-enhanced MRA and with digital subtraction angiography (DSA) for abdominal aortic aneurysm were retrospectively evaluated by three independent readers. The MRA datasets were viewed using VRT with three different standardized transfer functions: the percentile method (Pc-VRT), the maximum-likelihood method (ML-VRT), and the partial range histogram method (PRH-VRT). The aortic diameters obtained with these three methods were compared with freely chosen VRT parameters (F-VRT) and with maximum intensity projection (MIP) concerning inter-reader variability and agreement with the reference method DSA. Results: F-VRT parameters and PRH-VRT gave significantly higher diameter values than DSA, whereas Pc-VRT gave significantly lower values than DSA. The highest interobserver variability was found for F-VRT parameters and MIP, and the lowest for Pc-VRT and PRH-VRT. All standardized VRT methods were significantly superior to both MIP and F-VRT in this respect. The agreement with DSA was best for PRH-VRT, which was the only method with a mean error below 1 mm and which also had the narrowest limits of agreement (95% of cases between 2.1 mm below and 3.1 mm above DSA). Conclusion: All the standardized VRT methods compare favorably with MIP and VRT with freely selected parameters as regards interobserver variability. The partial range histogram method, although systematically overestimating vessel diameters, gives results closest to those of DSA.</description><subject>Analysis of Variance</subject><subject>Angiography, Digital Subtraction</subject><subject>Aortic Aneurysm, Abdominal - pathology</subject><subject>Biological and medical sciences</subject><subject>Cardiovascular system</subject><subject>Contrast Media</subject><subject>Gadolinium DTPA</subject><subject>Humans</subject><subject>Imaging, Three-Dimensional</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Magnetic Resonance Angiography - standards</subject><subject>Medical sciences</subject><subject>Medicin och hälsovetenskap</subject><subject>Observer Variation</subject><subject>Radiodiagnosis. Nmr imagery. 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B.</creator><creator>Lundström, C.</creator><creator>Dahlström, N.</creator><creator>Othberg, F.</creator><creator>Smedby, Ö.</creator><general>Informa UK Ltd</general><general>SAGE Publications</general><general>Taylor &amp; Francis</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>ADTPV</scope><scope>AOWAS</scope><scope>DG8</scope></search><sort><creationdate>20060301</creationdate><title>Standardized Volume Rendering for Magnetic Resonance Angiography Measurements in the Abdominal Aorta</title><author>Persson, A. ; Brismar, T. B. ; Lundström, C. ; Dahlström, N. ; Othberg, F. ; Smedby, Ö.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c543t-b05c4d997943fab2a524cbcbe7c79a680a13ad4f4929dc6a969447fc324420ef3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Analysis of Variance</topic><topic>Angiography, Digital Subtraction</topic><topic>Aortic Aneurysm, Abdominal - pathology</topic><topic>Biological and medical sciences</topic><topic>Cardiovascular system</topic><topic>Contrast Media</topic><topic>Gadolinium DTPA</topic><topic>Humans</topic><topic>Imaging, Three-Dimensional</topic><topic>Investigative techniques, diagnostic techniques (general aspects)</topic><topic>Magnetic Resonance Angiography - standards</topic><topic>Medical sciences</topic><topic>Medicin och hälsovetenskap</topic><topic>Observer Variation</topic><topic>Radiodiagnosis. Nmr imagery. Nmr spectrometry</topic><topic>Retrospective Studies</topic><topic>TECHNOLOGY</topic><topic>TEKNIKVETENSKAP</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Persson, A.</creatorcontrib><creatorcontrib>Brismar, T. B.</creatorcontrib><creatorcontrib>Lundström, C.</creatorcontrib><creatorcontrib>Dahlström, N.</creatorcontrib><creatorcontrib>Othberg, F.</creatorcontrib><creatorcontrib>Smedby, Ö.</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>SwePub</collection><collection>SwePub Articles</collection><collection>SWEPUB Linköpings universitet</collection><jtitle>Acta radiologica (1987)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Persson, A.</au><au>Brismar, T. B.</au><au>Lundström, C.</au><au>Dahlström, N.</au><au>Othberg, F.</au><au>Smedby, Ö.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Standardized Volume Rendering for Magnetic Resonance Angiography Measurements in the Abdominal Aorta</atitle><jtitle>Acta radiologica (1987)</jtitle><addtitle>Acta Radiol</addtitle><date>2006-03-01</date><risdate>2006</risdate><volume>47</volume><issue>2</issue><spage>172</spage><epage>178</epage><pages>172-178</pages><issn>0284-1851</issn><issn>1600-0455</issn><eissn>1600-0455</eissn><coden>ACRAE3</coden><abstract>Purpose: To compare three methods for standardizing volume rendering technique (VRT) protocols by studying aortic diameter measurements in magnetic resonance angiography (MRA) datasets. Material and Methods: Datasets from 20 patients previously examined with gadolinium-enhanced MRA and with digital subtraction angiography (DSA) for abdominal aortic aneurysm were retrospectively evaluated by three independent readers. The MRA datasets were viewed using VRT with three different standardized transfer functions: the percentile method (Pc-VRT), the maximum-likelihood method (ML-VRT), and the partial range histogram method (PRH-VRT). The aortic diameters obtained with these three methods were compared with freely chosen VRT parameters (F-VRT) and with maximum intensity projection (MIP) concerning inter-reader variability and agreement with the reference method DSA. Results: F-VRT parameters and PRH-VRT gave significantly higher diameter values than DSA, whereas Pc-VRT gave significantly lower values than DSA. The highest interobserver variability was found for F-VRT parameters and MIP, and the lowest for Pc-VRT and PRH-VRT. All standardized VRT methods were significantly superior to both MIP and F-VRT in this respect. The agreement with DSA was best for PRH-VRT, which was the only method with a mean error below 1 mm and which also had the narrowest limits of agreement (95% of cases between 2.1 mm below and 3.1 mm above DSA). Conclusion: All the standardized VRT methods compare favorably with MIP and VRT with freely selected parameters as regards interobserver variability. The partial range histogram method, although systematically overestimating vessel diameters, gives results closest to those of DSA.</abstract><cop>London, England</cop><pub>Informa UK Ltd</pub><pmid>16604964</pmid><doi>10.1080/02841850500445298</doi><tpages>7</tpages></addata></record>
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subjects Analysis of Variance
Angiography, Digital Subtraction
Aortic Aneurysm, Abdominal - pathology
Biological and medical sciences
Cardiovascular system
Contrast Media
Gadolinium DTPA
Humans
Imaging, Three-Dimensional
Investigative techniques, diagnostic techniques (general aspects)
Magnetic Resonance Angiography - standards
Medical sciences
Medicin och hälsovetenskap
Observer Variation
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Retrospective Studies
TECHNOLOGY
TEKNIKVETENSKAP
title Standardized Volume Rendering for Magnetic Resonance Angiography Measurements in the Abdominal Aorta
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