Publication

Automatic determination of vertical cup-to-disc ratio in retinal fundus images for glaucoma screening

Guo, J., Azzopardi, G., Shi, C., Jansonius, N. M. & Petkov, N., 1-Jan-2019, In : IEEE Access. 7, p. 8527-8541 15 p.

Research output: Contribution to journalArticleAcademicpeer-review

Glaucoma is a chronic progressive optic neuropathy that causes visual impairment or blindness, if left untreated. It is crucial to diagnose it at an early stage in order to enable treatment. Fundus photography is a viable option for population-based screening. A fundus photograph enables the observation of the excavation of the optic disc - the hallmark of glaucoma. The excavation is quantified as vertical cup-todisc ratio (VCDR). The manual assessment of retinal fundus images is, however, time-consuming and costly. Thus, an automated system is necessary to assist human observers. We propose a computer aided diagnosis system, which consists of localization of the optic disc, determination of the height of the optic disc and the cup, and computation of the VCDR. We evaluated the performance of our approach on eight publicly available data sets, which have in total 1712 retinal fundus images.We compared the obtained VCDR values with those provided by an experienced ophthalmologist and achieved a weighted VCDR mean difference of 0:11. The system provides a reliable estimation of the height of the optic disc and the cup in terms of the Relative Height Error (RHE = 0:08 and 0:09, respectively). Bland-Altman analysis showed that the system achieves a good agreement with the manual annotations especially for large VCDRs, which indicate pathology.
Original languageEnglish
Pages (from-to)8527-8541
Number of pages15
JournalIEEE Access
Volume7
Early online date2019
Publication statusPublished - 1-Jan-2019

    Keywords

  • Glaucoma, Retinal fundus images, Vertical cup-to-disc ratio, Trainable COSFIRE filters, GMLVQ

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