1. Articles from Mohana Kuppuswamy Parthasarathy

    1-5 of 5
    1. OCTID: Optical Coherence Tomography Image Database

      OCTID: Optical Coherence Tomography Image Database

      Optical coherence tomography (OCT) is a non-invasive imaging modality which is widely used in clinical ophthalmology. OCT images are capable of visualizing deep retinal layers which is crucial for the early diagnosis of retinal diseases. In this paper, we describe a comprehensive open-access database containing more than 500 high-resolution images categorized into different pathological conditions. The image classes include Normal (NO), Macular Hole (MH), Age-related Macular Degeneration (AMD), Central Serous Retinopathy, and Diabetic Retinopathy (DR). The images were obtained from a raster scan protocol with a 2mm scan length and 512x1024 pixels resolution. We have also included 25 normal OCT ...

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    2. Classification of optical coherence tomography images for diagnosing different ocular diseases

      Classification of optical coherence tomography images for diagnosing different ocular diseases

      Optical Coherence tomography (OCT) images provide several indicators, e.g., the shape and the thickness of different retinal layers, which can be used for various clinical and non-clinical purposes. We propose an automated classification method to identify different ocular diseases, based on the local binary pattern features. The database consists of normal and diseased human eye SD-OCT images. We use a multiphase approach for building our classifier, including preprocessing, Meta learning, and active learning. Pre-processing is applied to the data to handle missing features from images and replace them with the mean or median of the corresponding feature. All the ...

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    3. Intra-retinal segmentation of optical coherence tomography images using active contours with a dynamic programming initialization and an adaptive weighting strategy

      Intra-retinal segmentation of optical coherence tomography images using active contours with a dynamic programming initialization and an adaptive weighting strategy

      Retinal layer shape and thickness are one of the main indicators in the diagnosis of ocular diseases. We present an active contour approach to localize intra-retinal boundaries of eight retinal layers from OCT images. The initial locations of the active contour curves are determined using a Viterbi dynamic programming method. The main energy function is a Chan-Vese active contour model without edges. A boundary term is added to the energy function using an adaptive weighting method to help curves converge to the retinal layer edges more precisely, after evolving of curves towards boundaries, in final iterations. A wavelet-based denoising method ...

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    4. Optical coherence tomography: A guide to interpretation of common macular diseases

      Optical coherence tomography: A guide to interpretation of common macular diseases

      Optical coherence tomography (OCT) is an optical analog of ultrasound imaging that uses low coherence interferometry to produce cross-sectional images of the retina. It captures optical scattering from the tissue to decode spatial details of tissue microstructures. It uses infrared light from a super-luminescent diode that is divided into two parts: one of which is reflected from a reference mirror and the other is scattered from the biological tissue. The two reflected beams of light are made to produce interference patterns to obtain the echo time delay and their amplitude information that makes up an A-Scan. A-Scans that are captured ...

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    5. Effect of ocular magnification on macular measurements made using spectral domain optical coherence tomography

      Effect of ocular magnification on macular measurements made using spectral domain optical coherence tomography

      Aim: The aim of the present study was to study the effect of ocular magnification on macular measurements made using spectral domain optical coherence tomography (OCT). Materials and Methods: One hundred and fifty-one subjects were included from the normative study of foveal morphology carried out at our hospital. Subjects underwent comprehensive eye examination and macular scanning using Cirrus high-definition OCT and axial length (AXL) measurement. Macular cube 512 × 128 scan protocol was used for scanning the macula. Automated measurements of the fovea namely foveal diameter, foveal slope (lateral measurements) and foveal depth (axial measurement) were taken. A correction factor for ...

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    1-5 of 5
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    1. (4 articles) University of Waterloo
    2. (1 articles) Carl Zeiss Meditec
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    Effect of ocular magnification on macular measurements made using spectral domain optical coherence tomography Optical coherence tomography: A guide to interpretation of common macular diseases Intra-retinal segmentation of optical coherence tomography images using active contours with a dynamic programming initialization and an adaptive weighting strategy Classification of optical coherence tomography images for diagnosing different ocular diseases OCTID: Optical Coherence Tomography Image Database New OCT-A device allows imaging of nonsedated infants Are nuclei in stratified squamous epithelium high scattering or low scattering? Efficacy of the proximal optimization technique on crossover stenting in coronary bifurcation lesions in the 3D-OCT bifurcation registry COmbined multimodal analysis of Peripheral Retinal and mAcular circulation in Diabetic Retinopathy (COPRA Study) A new step for volumetric laser endomicroscopy: entering the therapeutic realm of endoscopic mucosal resection Depth resolved label-free multimodal optical imaging platform to study morpho-molecular composition of tissue Classification of dry age-related macular degeneration and diabetic macular edema from optical coherence tomography images using dictionary learning