Computer-assisted methods to evaluate retinal vascular caliber: what are they measuring?
Invest Ophthalmol Vis Sci
; 52(2): 810-5, 2011 Feb 09.
Article
em En
| MEDLINE
| ID: mdl-21051725
PURPOSE: Computer-assisted methods to measure retinal vessel diameters have been incorporated into research, but it is not clear which component of the vessels they are measuring. This study was conducted to compare measurements of retinal vessel diameter by using imaging-processing software on color fundus photographs (FPs) and fluorescein angiographs (FAs). METHODS: FP and FA images were taken simultaneously in 52 eyes of 31 patients referred for angiography for diagnosis of retinal disease. Arteriolar and venular calibers were measured in two concentric zones around the optic disc center. Pearson correlation coefficients and Bland-Altman plots were used to evaluate the agreement between the measurements made by FP and FA. RESULTS: The differences between the diameters measured by the microdensitometric method from FP and FA were 2.59 ± 8.67 µm in the inner arteriola, 4.93 ± 7.47 µm in the outer arteriola, -1,58 ± 8.49 µm in the inner venula, and -1.80 ± 7.28 µm in the outer venula. The differences plotted by the Bland-Altman method were slight. The Pearson correlation coefficients of measurements by FP and FA were 0.84 for inner zone and 0.87 for outer zone arterioles and 0.93 and 0.94 for the inner and outer zone venules, respectively. CONCLUSIONS: The very slight differences between measurements of retinal vessel diameter by the two methods demonstrate that the microdensitometric method mostly measures the vessel lumen. Differences in vessel diameters measured by the microdensitometric method observed in clinical conditions may therefore be ascribed to variation in wall thickness or vasoconstriction.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vasos Retinianos
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Processamento de Imagem Assistida por Computador
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Angiofluoresceinografia
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Fotografação
Tipo de estudo:
Diagnostic_studies
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Observational_studies
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Prevalence_studies
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Risk_factors_studies
Limite:
Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Invest Ophthalmol Vis Sci
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos