Neuroretinal rim measurement error using PC-based stereo software
ABSTRACT The neuroretinal rims of a set of glaucoma patients were measured using digitized stereo photographs, to determine the reproducibility of computerized stereo measurements of the neuroretinal rim. Each rim was measured five times at 18 locations, with measurement error (ME) defined as the me...
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| Veröffentlicht in: | Clinical & Experimental Ophthalmology 2000-06, Vol.28 (3), p.178-180 |
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| container_title | Clinical & Experimental Ophthalmology |
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| creator | Eikelboom, Robert H Barry, Chris J Jitskaia, Ludmila Voon, Angel Sp Yogesan, Kanagasingam |
| description | ABSTRACT
The neuroretinal rims of a set of glaucoma patients were measured using digitized stereo photographs, to determine the reproducibility of computerized stereo measurements of the neuroretinal rim. Each rim was measured five times at 18 locations, with measurement error (ME) defined as the mean of standard deviations of each set of measurements. The following ME were determined: (i) inter‐sessional variability (n = 27 right and 24 left eyes, at t1 and t2); (ii) inter‐assessor variability (n = 9, 2 assessors); and (iii) variability after colour adjustment algorithms were applied (n = 15). The results were as follows: (i) inter‐sessional variability was 3.41 ± 1.08 for t1 and 3.22 ± 0.84 for t2;; (ii) there was a significant difference between the two assessors, although the ME was still low; and (iii) there was no significant differences between the ME of unadjusted and adjusted images. With a measurement error of up to 11% of rim width, these results show that low‐ cost rim measurements can be made using PC‐based software. |
| doi_str_mv | 10.1046/j.1442-9071.2000.00298.x |
| format | Article |
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The neuroretinal rims of a set of glaucoma patients were measured using digitized stereo photographs, to determine the reproducibility of computerized stereo measurements of the neuroretinal rim. Each rim was measured five times at 18 locations, with measurement error (ME) defined as the mean of standard deviations of each set of measurements. The following ME were determined: (i) inter‐sessional variability (n = 27 right and 24 left eyes, at t1 and t2); (ii) inter‐assessor variability (n = 9, 2 assessors); and (iii) variability after colour adjustment algorithms were applied (n = 15). The results were as follows: (i) inter‐sessional variability was 3.41 ± 1.08 for t1 and 3.22 ± 0.84 for t2;; (ii) there was a significant difference between the two assessors, although the ME was still low; and (iii) there was no significant differences between the ME of unadjusted and adjusted images. With a measurement error of up to 11% of rim width, these results show that low‐ cost rim measurements can be made using PC‐based software.</description><identifier>ISSN: 1442-6404</identifier><identifier>EISSN: 1442-9071</identifier><identifier>DOI: 10.1046/j.1442-9071.2000.00298.x</identifier><identifier>PMID: 10981792</identifier><language>eng</language><publisher>Melbourne, Australia: Blackwell Science Pty</publisher><subject>Algorithms ; Analysis of Variance ; Diagnostic Errors ; Glaucoma - diagnosis ; Humans ; Image Processing, Computer-Assisted - methods ; measurement error ; Microcomputers ; Middle Aged ; neuroretinal rim ; Observer Variation ; optic disc ; Optic Disk - pathology ; Photography - methods ; reproducibility ; Reproducibility of Results ; Retina - pathology ; Software ; stereo imaging</subject><ispartof>Clinical & Experimental Ophthalmology, 2000-06, Vol.28 (3), p.178-180</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4028-660a880b8b3dfffe762f6623698e4a77152fb2117b5ee92003f600faf9f9b5673</citedby><cites>FETCH-LOGICAL-c4028-660a880b8b3dfffe762f6623698e4a77152fb2117b5ee92003f600faf9f9b5673</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1046%2Fj.1442-9071.2000.00298.x$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1046%2Fj.1442-9071.2000.00298.x$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>309,310,314,776,780,785,786,1411,23909,23910,25118,27901,27902,45550,45551</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/10981792$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Eikelboom, Robert H</creatorcontrib><creatorcontrib>Barry, Chris J</creatorcontrib><creatorcontrib>Jitskaia, Ludmila</creatorcontrib><creatorcontrib>Voon, Angel Sp</creatorcontrib><creatorcontrib>Yogesan, Kanagasingam</creatorcontrib><title>Neuroretinal rim measurement error using PC-based stereo software</title><title>Clinical & Experimental Ophthalmology</title><addtitle>Clin Exp Ophthalmol</addtitle><description>ABSTRACT
The neuroretinal rims of a set of glaucoma patients were measured using digitized stereo photographs, to determine the reproducibility of computerized stereo measurements of the neuroretinal rim. Each rim was measured five times at 18 locations, with measurement error (ME) defined as the mean of standard deviations of each set of measurements. The following ME were determined: (i) inter‐sessional variability (n = 27 right and 24 left eyes, at t1 and t2); (ii) inter‐assessor variability (n = 9, 2 assessors); and (iii) variability after colour adjustment algorithms were applied (n = 15). The results were as follows: (i) inter‐sessional variability was 3.41 ± 1.08 for t1 and 3.22 ± 0.84 for t2;; (ii) there was a significant difference between the two assessors, although the ME was still low; and (iii) there was no significant differences between the ME of unadjusted and adjusted images. With a measurement error of up to 11% of rim width, these results show that low‐ cost rim measurements can be made using PC‐based software.</description><subject>Algorithms</subject><subject>Analysis of Variance</subject><subject>Diagnostic Errors</subject><subject>Glaucoma - diagnosis</subject><subject>Humans</subject><subject>Image Processing, Computer-Assisted - methods</subject><subject>measurement error</subject><subject>Microcomputers</subject><subject>Middle Aged</subject><subject>neuroretinal rim</subject><subject>Observer Variation</subject><subject>optic disc</subject><subject>Optic Disk - pathology</subject><subject>Photography - methods</subject><subject>reproducibility</subject><subject>Reproducibility of Results</subject><subject>Retina - pathology</subject><subject>Software</subject><subject>stereo imaging</subject><issn>1442-6404</issn><issn>1442-9071</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkElPwzAQhS0EYv8LKCduCWPH8SJxQWWVqgIS281y2jFKSRqwE1H-PS6pEEdOM9K8NzPvIyShkFHg4mSeUc5ZqkHSjAFABsC0ypYbZPd3sLnuBQe-Q_ZCmEdhwXKxTXYoaEWlZrvkbIK9bz121cLWia-apEEbeo8NLroEfZwlfagWr8ndKC1twFkSOvTYJqF13af1eEC2nK0DHq7rPnm8vHgYXafj26ub0dk4nXJgKhUCrFJQqjKfOedQCuaEiO9ohdxKSQvmSkapLAtEHUPlTgA467TTZSFkvk-Oh73vvv3oMXSmqcIU69ousO2DkYxxWWgVhWoQTn0bgkdn3mMu678MBbPCZ-ZmRcasKJkVPvODzyyj9Wh9oy8bnP0xDryi4HQQfFY1fv17sRld3LKf19LBXkWIy1-79W8mJpSFeZ5cGXh4OedPL5fmPv8GBcOMug</recordid><startdate>200006</startdate><enddate>200006</enddate><creator>Eikelboom, Robert H</creator><creator>Barry, Chris J</creator><creator>Jitskaia, Ludmila</creator><creator>Voon, Angel Sp</creator><creator>Yogesan, Kanagasingam</creator><general>Blackwell Science Pty</general><scope>BSCLL</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></search><sort><creationdate>200006</creationdate><title>Neuroretinal rim measurement error using PC-based stereo software</title><author>Eikelboom, Robert H ; Barry, Chris J ; Jitskaia, Ludmila ; Voon, Angel Sp ; Yogesan, Kanagasingam</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4028-660a880b8b3dfffe762f6623698e4a77152fb2117b5ee92003f600faf9f9b5673</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Algorithms</topic><topic>Analysis of Variance</topic><topic>Diagnostic Errors</topic><topic>Glaucoma - diagnosis</topic><topic>Humans</topic><topic>Image Processing, Computer-Assisted - methods</topic><topic>measurement error</topic><topic>Microcomputers</topic><topic>Middle Aged</topic><topic>neuroretinal rim</topic><topic>Observer Variation</topic><topic>optic disc</topic><topic>Optic Disk - pathology</topic><topic>Photography - methods</topic><topic>reproducibility</topic><topic>Reproducibility of Results</topic><topic>Retina - pathology</topic><topic>Software</topic><topic>stereo imaging</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Eikelboom, Robert H</creatorcontrib><creatorcontrib>Barry, Chris J</creatorcontrib><creatorcontrib>Jitskaia, Ludmila</creatorcontrib><creatorcontrib>Voon, Angel Sp</creatorcontrib><creatorcontrib>Yogesan, Kanagasingam</creatorcontrib><collection>Istex</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><jtitle>Clinical & Experimental Ophthalmology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Eikelboom, Robert H</au><au>Barry, Chris J</au><au>Jitskaia, Ludmila</au><au>Voon, Angel Sp</au><au>Yogesan, Kanagasingam</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Neuroretinal rim measurement error using PC-based stereo software</atitle><jtitle>Clinical & Experimental Ophthalmology</jtitle><addtitle>Clin Exp Ophthalmol</addtitle><date>2000-06</date><risdate>2000</risdate><volume>28</volume><issue>3</issue><spage>178</spage><epage>180</epage><pages>178-180</pages><issn>1442-6404</issn><eissn>1442-9071</eissn><abstract>ABSTRACT
The neuroretinal rims of a set of glaucoma patients were measured using digitized stereo photographs, to determine the reproducibility of computerized stereo measurements of the neuroretinal rim. Each rim was measured five times at 18 locations, with measurement error (ME) defined as the mean of standard deviations of each set of measurements. The following ME were determined: (i) inter‐sessional variability (n = 27 right and 24 left eyes, at t1 and t2); (ii) inter‐assessor variability (n = 9, 2 assessors); and (iii) variability after colour adjustment algorithms were applied (n = 15). The results were as follows: (i) inter‐sessional variability was 3.41 ± 1.08 for t1 and 3.22 ± 0.84 for t2;; (ii) there was a significant difference between the two assessors, although the ME was still low; and (iii) there was no significant differences between the ME of unadjusted and adjusted images. With a measurement error of up to 11% of rim width, these results show that low‐ cost rim measurements can be made using PC‐based software.</abstract><cop>Melbourne, Australia</cop><pub>Blackwell Science Pty</pub><pmid>10981792</pmid><doi>10.1046/j.1442-9071.2000.00298.x</doi><tpages>3</tpages></addata></record> |
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| source | Wiley Online Library - AutoHoldings Journals; MEDLINE |
| subjects | Algorithms Analysis of Variance Diagnostic Errors Glaucoma - diagnosis Humans Image Processing, Computer-Assisted - methods measurement error Microcomputers Middle Aged neuroretinal rim Observer Variation optic disc Optic Disk - pathology Photography - methods reproducibility Reproducibility of Results Retina - pathology Software stereo imaging |
| title | Neuroretinal rim measurement error using PC-based stereo software |
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