Quantitative measurement of changes in retinal vessel diameter in ocular fundus images

Lars Pedersen, Michael Grunkin, Bjarne Kjær Ersbøll, K. Madsen, N. Christoffersen, Ulrik Skands

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    The change in diameter of retinal vessels as a function of increasing distance to the optic disc is believed to be indicative of the risk level of various vascular diseases such as generalised arteriosclerosis and Diabetes Mellitus. In particular, focal arteriolar narrowing (FAN) is considered related to;arteriosclerosis. The aim of this work is to develop methods to provide quantitative information about the FAN status of retinal arteriolar vessel segments. We propose a method to measure the vessel diameter and changes herein along the vessel. The width or diameter measurement is based on intensity profiles orthogonal to a smoothed trace in the vessel found by Dijkstra's shortest path algorithm. The vessel diameter is calculated from the intensity profiles using two different methods to estimate profile widths. We propose a "normalised accumulated gradient" (NAG) and the coefficient of variance (CV) to estimate the FAN in a vessel segment. The NAG is designed to detect increases in the vessel diameter as the distance to the papilla increases. The performance of the methods developed is compared to the evaluation by a skilled ophthalmologist. The methods are seen to perform well. (C) 2000 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    JournalPattern Recognition Letters
    Volume21
    Issue number13-14
    Pages (from-to)1215-1223
    ISSN0167-8655
    DOIs
    Publication statusPublished - 2000
    Event11th Scandinavian Conference on Image Analysis (SCIA) - Kangerlussuaq, Greenland
    Duration: 7 Jun 199911 Jun 1999
    Conference number: 11

    Conference

    Conference11th Scandinavian Conference on Image Analysis (SCIA)
    Number11
    CountryGreenland
    CityKangerlussuaq
    Period07/06/199911/06/1999

    Keywords

    • Image analysis
    • Vessel diameter measurement
    • Fundus images
    • Focal arteriolar narrowing

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