NDLI: Effect of image compression and resolution on retinal vascular caliber.

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Effect of image compression and resolution on retinal vascular caliber.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Peng, Qian Hubbard, Larry D. Narkar, Ashwini Ferrier, Nicola J. Gangaputra, Sapna Pauli, Thomas W. Chandler, Charles S. Thayer, Dennis W. Danis, Ronald P.
Description	Country affiliation: United States Author Affiliation: Pauli TW ( Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53717, USA.)
Abstract	PURPOSE: Changes in retinal vascular caliber measured from digital color fundus photographs have been independently associated with systemic outcomes in epidemiologic studies, but the effect of image resolution and compression on vascular measurements has not been previously evaluated. METHODS: To explore image compression, 40 natively digital fundus images were selected with good photo quality, high spatial resolution, and no previous image compression. Using Adobe Photoshop, these images were compressed at progressively higher levels up to 147:1, and then retinal vascular caliber was measured at each level using semiautomated software. To examine resolution, 40 fundus photographs acquired on high-resolution film were scanned with settings corresponding to 10, 7, 5, 3, and 1 megapixel fundus cameras. After adjusting for scale factor, vascular caliber was measured at each level of resolution. Data were analyzed by comparing the calculated central retinal arteriole equivalent (CRAE) and the central retinal venular equivalent (CRVE) of the original and altered images, using repeated measures ANOVA. RESULTS: CRAE became significantly wider with increasing levels of compression at the 25:1 threshold (~1 µm wider, P < 0.001) and was ~5 µm wider with 147:1 compression. CRVE also increased, but less than CRAE. Using 7 (megapixel)-MP resolution as the standard, CRVE was significantly narrower at the 5-MP simulation (~2 µm, P < 0.001) and was ~12 µm narrower at the 1-MP simulation. CRAE also decreased, but less than CRVE. CONCLUSIONS: Increasing digital image file compression and decreasing fundus image spatial resolution led to skewed measurements of the retinal vascular caliber.
ISSN	01460404
e-ISSN	15525783
Journal	Investigative Opthalmology & Visual Science
Issue Number	9
Volume Number	53
Language	English
Publisher	Association for Research in Vision and Ophthalmology
Publisher Date	2012-08-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Image Processing, Computer-assisted Retinal Diseases Diagnosis Retinal Vessels Pathology Analysis Of Variance Calibration Discipline Ophthalmology
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Sensory Systems Cellular and Molecular Neuroscience

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