A level-set method for pathology segmentation in fluorescein angiograms and en face retinal images of patients with age-related macular degeneration

Fatimah Mohammad; Rashid Ansari; Mahnaz Shahidi

doi:10.1117/12.2006697

29 March 2013 A level-set method for pathology segmentation in fluorescein angiograms and en face retinal images of patients with age-related macular degeneration

Fatimah Mohammad, Rashid Ansari, Mahnaz Shahidi

Author Affiliations +

Proceedings Volume 8676, Medical Imaging 2013: Digital Pathology; 86760R (2013) https://doi.org/10.1117/12.2006697
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

The visibility and continuity of the inner segment outer segment (ISOS) junction layer of the photoreceptors on spectral domain optical coherence tomography images is known to be related to visual acuity in patients with age-related macular degeneration (AMD). Automatic detection and segmentation of lesions and pathologies in retinal images is crucial for the screening, diagnosis, and follow-up of patients with retinal diseases. One of the challenges of using the classical level-set algorithms for segmentation involves the placement of the initial contour. Manually defining the contour or randomly placing it in the image may lead to segmentation of erroneous structures. It is important to be able to automatically define the contour by using information provided by image features. We explored a level-set method which is based on the classical Chan-Vese model and which utilizes image feature information for automatic contour placement for the segmentation of pathologies in fluorescein angiograms and en face retinal images of the ISOS layer. This was accomplished by exploiting a priori knowledge of the shape and intensity distribution allowing the use of projection profiles to detect the presence of pathologies that are characterized by intensity differences with surrounding areas in retinal images. We first tested our method by applying it to fluorescein angiograms. We then applied our method to en face retinal images of patients with AMD. The experimental results included demonstrate that the proposed method provided a quick and improved outcome as compared to the classical Chan-Vese method in which the initial contour is randomly placed, thus indicating the potential to provide a more accurate and detailed view of changes in pathologies due to disease progression and treatment.

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Fatimah Mohammad, Rashid Ansari, and Mahnaz Shahidi "A level-set method for pathology segmentation in fluorescein angiograms and en face retinal images of patients with age-related macular degeneration", Proc. SPIE 8676, Medical Imaging 2013: Digital Pathology, 86760R (29 March 2013); https://doi.org/10.1117/12.2006697

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KEYWORDS

Image segmentation

Pathology

Angiography

Visualization

Image processing algorithms and systems

Medical imaging

Optical coherence tomography

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