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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
2 Pt 1
|
pubmed:dateCreated |
1994-7-22
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pubmed:abstractText |
Endoscopic measurement of lesions is of great importance in the design and performance of clinical trials, as, for example, in studies of ulcer disease. Endoscopes are constructed with wide-angle lenses that significantly distort the image by creating a relative compression of points in its periphery. We have recently developed a computer program to correct the distortion of the wide-angle lens. We sought to determine the accuracy of the currently used open-biopsy forceps measurement technique and compare it to that of an image-processing technique designed to correct image distortion. The overall error of the open-biopsy forceps technique using an in vitro ulcer model was under-estimation of lesion size by 41.8% +/- 23.3%. When image processing was used to correct distortion, error was significantly decreased to 1.8% +/- 2.2% (p < 0.05). In vivo measurements were made using an inserted object of known size (coated chewing gum). The mean error of the forceps technique in vivo was 26.5% +/- 5.7% (under-estimation of size), which improved significantly to an error of 2.8% +/- 3.2% (p < 0.05) with the image-processing technique. We conclude that image processing significantly enhances the accuracy of measurement at endoscopy.
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pubmed:commentsCorrections | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:issn |
0016-5107
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pubmed:author | |
pubmed:issnType |
Print
|
pubmed:volume |
40
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pubmed:owner |
NLM
|
pubmed:authorsComplete |
Y
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pubmed:pagination |
178-83
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:8013818-Biopsy,
pubmed-meshheading:8013818-Calibration,
pubmed-meshheading:8013818-Chewing Gum,
pubmed-meshheading:8013818-Endoscopes, Gastrointestinal,
pubmed-meshheading:8013818-Endoscopy, Gastrointestinal,
pubmed-meshheading:8013818-Humans,
pubmed-meshheading:8013818-Image Processing, Computer-Assisted,
pubmed-meshheading:8013818-Lenses,
pubmed-meshheading:8013818-Models, Structural,
pubmed-meshheading:8013818-Size Perception,
pubmed-meshheading:8013818-Software,
pubmed-meshheading:8013818-Stomach Ulcer
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pubmed:articleTitle |
Endoscopic measurement of lesion size: improved accuracy with image processing.
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pubmed:affiliation |
Department of Medicine, University of Rochester.
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pubmed:publicationType |
Journal Article,
In Vitro
|