Download or read book Retinal Images for Diagnosis of Eye Diseases by Feature Extraction written by Karkuzhali S and published by . This book was released on 2022-12-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Human eye is one of the important organs in human body, with iris, pupil, sclera, cornea, lens, retina and optic nerve. Many important eye diseases as well as systemic diseases manifest themselves in the retina. The most widespread causes of blindness in the industrialized world are glaucoma, Age Related Macular Degeneration (ARMD), Diabetic Retinopathy (DR) and Diabetic Macula Edema (DME). The development of a retinal image analysis system is a demanding research topic for early detection, progression analysis and diagnosis of eye diseases. The objective of the research work is to diagnose a retinal disease that leads to major blindness using fundus images. The main objectives of a retinal image analysis system are To analyze retinal images and to identify abnormalities in them. To locate and segment structural indicators of eye diseases. To develop an automated screening system to diagnose eye diseases earlier. To develop novel segmentation and classification methods that overcome the inefficiencies of other existing techniques in detecting abnormalities.
Download or read book Comprehensive Retinal Image Analysis Image Processing and Feature Extraction Techniques Oriented to the Clinical Task written by Andrés G. Marrugo Hernández and published by . This book was released on 2014 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Medical digital imaging has become a key element of modern health care procedures. It provides a visual documentation, a permanent record for the patients, and most importantly the ability to extract information about many diseases. Ophthalmology is a field that is heavily dependent on the analysis of digital images because they can aid in establishing an early diagnosis even before the first symptoms appear. This dissertation contributes to the digital analysis of such images and the problems that arise along the imaging pipeline, a field that is commonly referred to as retinal image analysis. We have dealt with and proposed solutions to problems that arise in retinal image acquisition and longitudinal monitoring of retinal disease evolution. Specifically, non-uniform illumination, poor image quality, automated focusing, and multichannel analysis. However, there are many unavoidable situations in which images of poor quality, like blurred retinal images because of aberrations in the eye, are acquired. To address this problem we have proposed two approaches for blind deconvolution of blurred retinal images. In the first approach, we consider the blur to be space-invariant and later in the second approach we extend the work and propose a more general space-variant scheme. For the development of the algorithms we have built preprocessing solutions that have enabled the extraction of retinal features of medical relevancy, like the segmentation of the optic disc and the detection and visualization of longitudinal structural changes in the retina. Encouraging experimental results carried out on real retinal images coming from the clinical setting demonstrate the applicability of our proposed solutions.
Download or read book Image Analysis and Modeling in Ophthalmology written by Eddie Y. K. Ng and published by CRC Press. This book was released on 2014-02-11 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital fundus images can effectively diagnose glaucoma and diabetes retinopathy, while infrared imaging can show changes in the vascular tissues. Likening the eye to the conventional camera, Image Analysis and Modeling in Ophthalmology explores the application of advanced image processing in ocular imaging. This book considers how images can be used to effectively diagnose ophthalmologic problems. It introduces multi-modality image processing algorithms as a means for analyzing subtle changes in the eye. It details eye imaging, textural imaging, and modeling, and highlights specific imaging and modeling techniques. The book covers the detection of diabetes retinopathy, glaucoma, anterior segment eye abnormalities, instruments on detection of glaucoma, and development of human eye models using computational fluid dynamics and heat transfer principles to predict inner temperatures of the eye from its surface temperature. It presents an ultrasound biomicroscopy (UBM) system for anterior chamber angle imaging and proposes an automated anterior segment eye disease classification system that can be used for early disease diagnosis and treatment management. It focuses on the segmentation of the blood vessels in high-resolution retinal images and describes the integration of the image processing methodologies in a web-based framework aimed at retinal analysis. The authors introduce the A-Levelset algorithm, explore the ARGALI system to calculate the cup-to-disc ratio (CDR), and describe the Singapore Eye Vessel Assessment (SIVA) system, a holistic tool which brings together various technologies from image processing and artificial intelligence to construct vascular models from retinal images. The text furnishes the working principles of mechanical and optical instruments for the diagnosis and healthcare administration of glaucoma, reviews state-of-the-art CDR calculation detail, and discusses the existing methods and databases. Image Analysis and Modeling in Ophthalmology includes the latest research development in the field of eye modeling and the multi-modality image processing techniques in ocular imaging. It addresses the differences, performance measures, advantages and disadvantages of various approaches, and provides extensive reviews on related fields.
Download or read book Digital Image Processing for Ophthalmology written by Xiaolu Zhu and published by Springer Nature. This book was released on 2022-05-31 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundus images of the retina are color images of the eye taken by specially designed digital cameras. Ophthalmologists rely on fundus images to diagnose various diseases that affect the eye, such as diabetic retinopathy and retinopathy of prematurity. A crucial preliminary step in the analysis of retinal images is the identification and localization of important anatomical structures, such as the optic nerve head (ONH), the macula, and the major vascular arcades. Identification of the ONH is an important initial step in the detection and analysis of the anatomical structures and pathological features in the retina. Different types of retinal pathology may be detected and analyzed via the application of appropriately designed techniques of digital image processing and pattern recognition. Computer-aided analysis of retinal images has the potential to facilitate quantitative and objective analysis of retinal lesions and abnormalities. Accurate identification and localization of retinal features and lesions could contribute to improved diagnosis, treatment, and management of retinopathy. This book presents an introduction to diagnostic imaging of the retina and an overview of image processing techniques for ophthalmology. In particular, digital image processing algorithms and pattern analysis techniques for the detection of the ONH are described. In fundus images, the ONH usually appears as a bright region, white or yellow in color, and is indicated as the convergent area of the network of blood vessels. Use of the geometrical and intensity characteristics of the ONH, as well as the property that the ONH represents the location of entrance of the blood vessels and the optic nerve into the retina, is demonstrated in developing the methods. The image processing techniques described in the book include morphological filters for preprocessing fundus images, filters for edge detection, the Hough transform for the detection of lines and circles, Gabor filters to detect the blood vessels, and phase portrait analysis for the detection of convergent or node-like patterns. Illustrations of application of the methods to fundus images from two publicly available databases are presented, in terms of locating the center and the boundary of the ONH. Methods for quantitative evaluation of the results of detection of the ONH using measures of overlap and free-response receiver operating characteristics are also described. Table of Contents: Introduction / Computer-aided Analysis of Images of the Retina / Detection of Geometrical Patterns / Datasets and Experimental Setup / Detection of the\\Optic Nerve Head\\Using the Hough Transform / Detection of the\\Optic Nerve Head\\Using Phase Portraits / Concluding Remarks
Download or read book Ophthalmology Breakthroughs in Research and Practice written by Management Association, Information Resources and published by IGI Global. This book was released on 2018-01-05 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced techniques in eye care has significantly influenced how diseases and conditions are treated and diagnosed. While many strides have been made, there is still continuous research in the ophthalmology field. Ophthalmology: Breakthroughs in Research and Practice is an innovative reference source for the latest academic material on the identification, treatment, and management methodologies of eye diseases and disorders. Highlighting a range of topics, such as retinal prosthesis, ocular diseases, and ophthalmoscopy, this publication is ideally designed for researchers, graduate-level students, and professionals in the medical field.
Download or read book Classification Of Fundus Images Captured Using D Eye smartphone Retinal Imaging System written by Y. Sravani Devi and published by Archers & Elevators Publishing House. This book was released on with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retinal Imaging written by David Huang and published by Mosby. This book was released on 2006 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: SECTION I: IMAGING MODALITIES: BASIC PRINCIPLES & INTERPRETATION -- 1. Fluorescein angiography -- 2. Indocyanine green angiography -- 3. Optical coherence tomography (OCT) -- -- 4. Optical coherence tomographic ophthalmoscopy -- 5. Ultrasound -- 6. Scanning laser tomography -- 7. Scanning laser polarimetry -- 8. Retinal thickness analyzer -- 9. Adaptive optics ophthalmoscopy -- 10. Imaging of Ocular Blood Flow -- SECTION II: MACULAR DISEASES -- 11. Non-neovascular age-related macular degeneration -- -- 12. Neovascular Age-Related Macular Degeneration -- 13. Pathologic myopia -- 14. Central serous retinopathy -- 15. Macular holes -- 16. Epiretinal membranes -- 17. Macular dystrophies -- 18. Cystoid macular edema -- 19. Angiod streaks -- 20. Chrorioretinal folds -- SECTION III: RETINAL VASCULAR DISEASES -- 21. Diabetic Retinopathy -- 22. Arterial obstructive disease -- 23. Venous obstructive disease -- 24. Parafoveal Telangiectasis -- 25. Coats' disease -- 26. Retinopathy of prematurity -- 27. Ocular ischemic syndrome -- 28. Hypertensive retinopathy -- 29. Radiation retinopathy -- 30. Retinal artery macroanuerysm -- SECTION IV: INFLAMMATORY & INFECTIOUS DISEASES -- 31. Posterior Scleritis -- -- 32. Pars Planitis -- 33. Sarcoidosis -- 34. Uveal Effusion Syndrome -- 35. White Dot Syndromes -- -- 36. Sympathetic Ophthalmia -- 37. Vogt-Koyanagi-Harada Disease -- 38. Syphilis -- 39. Tuberculosis -- 40. Ocular Histoplasmosis -- 41. Fungal Infections -- 42. Endophthalmitis -- 43. Acute Retinal Necrosis -- 44. Toxoplasmosis -- 45. Toxocariasis -- 46. Cysticercosis -- 47. Diffuse Unilateral Subacute Neuroretinitis -- 48. Cytomegalovirus Retinitis -- SECTION V: OTHER RETINAL DISEASES -- 49. Ocular Phototoxicity -- 50. Metabolic and nutritional anomalies -- 51. Medications and Retinal Toxicity -- 52. Retinal injuries -- 53. Hereditary/congenital vitreoretinal disorders -- 54. Retinitis pigmentosa and allied disorders -- SECTION VI: TUMORS -- 55. Retinoblastoma -- 56. Choroidal malignant melanoma -- 57. Choroidal nevus -- 58. Cavernous hemangioma of the retina -- 59. Retinal capillary hemangioma -- 60. Choroidal hemangioma -- -- 61. Tuberous sclerosis complex -- 62. Tumors and related lesions of the retinal pigment epithelium -- 63. Congenital hypertrophy of the retinal pigment epithelium and other pigmented lesions -- 64. Choroidal/retinal metastasis -- 65. Osteomas -- 66. Leukemia /lymphomas -- SECTION VII: OPTIC NERVE DISORDERS -- 67. Optic pits -- 68. Optic nerve head drusen -- 69. Melanocytoma of the optic disc -- 70. Papilledema -- 71. Glaucoma -- 72. Other optic nerve malformations.
Download or read book Diabetes and Fundus OCT written by Ayman S. El-Baz and published by Elsevier. This book was released on 2020-04-17 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diabetes and Fundus OCT brings together a stellar cast of authors who review the computer-aided diagnostic (CAD) systems developed to diagnose non-proliferative diabetic retinopathy in an automated fashion using Fundus and OCTA images. Academic researchers, bioengineers, new investigators and students interested in diabetes and retinopathy need an authoritative reference to bring this multidisciplinary field together to help reduce the amount of time spent on source-searching and instead focus on actual research and the clinical application. This reference depicts the current clinical understanding of diabetic retinopathy, along with the many scientific advances in understanding this condition. As the role of optical coherence tomography (OCT) in the assessment and management of diabetic retinopathy has become significant in understanding the vireo retinal relationships and the internal architecture of the retina, this information is more critical than ever. Includes unique information for academic clinicians, researchers and bioengineers Provides insights needed to understand the imaging modalities involved, the unmet clinical need that is being addressed, and the engineering and technical approaches applied Brings together details on the retinal vasculature in diabetics as imaged by optical coherence tomography angiography and automated detection of retinal disease
Download or read book Retinal Image Analytics written by Esra Ataer-Cansizoglu and published by . This book was released on 2015 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for computerized analysis of retinal images has been increasing with the wide clinical use of fundus photography. Retinopathy of prematurity (ROP) is among the diseases that can be diagnosed through the use of retinal images. It is a disease affecting low-birth weight infants, in which blood vessels in the retina of the eye develop abnormally and cause potential blindness. We propose an image processing and machine learning framework from the vasculature segmentation to diagnosis of Retinopathy of Prematurity (ROP) in retinal images. The system takes a retinal image as an input, does automatic vessel segmentation and tracing, extracts various features, performs feature selection and outputs a diagnostic decision. Although, ROP is the leading cause of childhood blindness in the world, there exists a wide variability among experts in diagnosis. We propose a method to do an in-depth feature and observer analysis by employing Mutual Information (MI) to understand the underlying causes of inter-expert disagreement. The contributions of this dissertation are (i) extraction of new features quantifying tortuosity and amount of branching that are useful for ROP diagnosis, (ii) a novel feature representation paradigm utilizing Gaussian Mixture Models of image features to better model tortuous and straight vessels, (iii) an accurate pairwise similarity measure between images based on the proposed feature representation, (iv) the use of the proposed similarity measure in support vector machine (SVM) and k-nearest neighbor (KNN) classifiers, and (v) a MI-based feature-observer analysis technique to understand the features that lead inter-expert disagreement. The proposed framework is the first fully-automated computer-aided diagnosis system for ROP disease. The experiments are carried out on two datasets each of which consists of wide-angle colored retinal images acquired during routine ROP exams. The first one is designed for feature-observer analysis and consists of 34 images diagnosed by 22 experts. The second one is designed for classification experiments and contains 77 images with reference standard diagnosis. In our feature-observer analysis, we observed that although ROP is defined based on arteriolar tortuosity and venous dilation, there exists other features that highly correlate with expert opinions. This finding shows that the definition of the disease is subjective. We obtain 95\% accuracy compared to the reference standard on the second dataset when we use features extracted from manual segmentations. This performance is comparable to the performance of the individual experts (96%, 93%, 92%), Williams test = 1.0. With the features extracted from computer-based segmentation algorithm, we achieve 80% accuracy, which is promising for a fully-automated system.
Download or read book Retina Atlas written by Dilraj S Grewal and published by Jaypee Brothers Medical Publishers. This book was released on 2020-04-30 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This atlas provides ophthalmologists with a collection of images to help with the identification, diagnosis and subsequent treatment of retinal disorders. The images are procured from Eidon scanner technology and also include optical coherence tomography (OCT) pictures to assist with understanding of related pathologies. Divided into nine sections, the book begins with images illustrating the normal fundus. Each of the following sections covers a different retinal disorder including diabetic retinopathy, macula disorders, retinal detachment, ocular tumours and hereditary diseases. Each section features a multitude of images, each with brief descriptive text to assist understanding. Key points Comprehensive atlas of retinal imaging for diagnosis of ocular disorders Images procured from Eidon scanner technology Includes OCT images to assist understanding of related pathologies Covers many different retinal disorders and diseases
Download or read book Application of Multimodal Imaging Combined with Artificial Intelligence in Eye Diseases written by Xin Huang and published by Frontiers Media SA. This book was released on 2023-10-18 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automated Image Detection of Retinal Pathology written by Herbert Jelinek and published by CRC Press. This book was released on 2009-10-09 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the Effect of Automated Assessment Programs on Health Care ProvisionDiabetes is approaching pandemic numbers, and as an associated complication, diabetic retinopathy is also on the rise. Much about the computer-based diagnosis of this intricate illness has been discovered and proven effective in research labs. But, unfortunately, many of
Download or read book Computational Analysis of the Human Eye with Applications written by Sumeet Dua and published by World Scientific. This book was released on 2011 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in semi-automated high-throughput image data collection routines, coupled with a decline in storage costs and an increase in high-performance computing solutions have led to an exponential surge in data collected by biomedical scientists and medical practitioners. Interpreting this raw data is a challenging task, and nowhere is this more evident than in the field of opthalmology. The sheer speed at which data on cataracts, diabetic retinopathy, glaucoma and other eye disorders are collected, makes it impossible for the human observer to directly monitor subtle, yet critical details. This book is a novel and well-timed endeavor to present, in an amalgamated format, computational image modeling methods as applied to various extrinsic scientific problems in ophthalmology. It is self-contained and presents a highly comprehensive array of image modeling algorithms and methodologies relevant to ophthalmologic problems. The book is the first of its kind, bringing eye imaging and multi-dimensional hyperspectral imaging and data fusion of the human eye, into focus. The editors are at the top of their fields and bring a strong multidisciplinary synergy to this visionary volume. Their "inverted-pyramid" approach in presenting the content and their focus on core applications will appeal to students and practitioners in the field.
Download or read book A Retinal Vessel Detection Approach Based on Shearlet Transform and Indeterminacy Filtering on Fundus Images written by Yanhui Guo and published by Infinite Study. This book was released on with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundus image is an effective tool for ophthalmologists studying eye diseases. Retinal vessel detection is a significant task in the identification of retinal disease regions. This study presents a retinal vessel detection approach using shearlet transform and indeterminacy filtering. The fundus image’s green channel is mapped in the neutrosophic domain via shearlet transform. The neutrosophic domain images are then filtered with an indeterminacy filter to reduce the indeterminacy information. A neural network classifier is employed to identify the pixels whose inputs are the features in neutrosophic images. The proposed approach is tested on two datasets, and a receiver operating characteristic curve and the area under the curve are employed to evaluate experimental results quantitatively. The area under the curve values are 0.9476 and 0.9469 for each dataset respectively, and 0.9439 for both datasets. The comparison with the other algorithms also illustrates that the proposed method yields the highest evaluation measurement value and demonstrates the efficiency and accuracy of the proposed method.â
Download or read book Computational Analysis Of The Human Eye With Applications written by Sumeet Dua and published by World Scientific. This book was released on 2011-04-21 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in semi-automated high-throughput image data collection routines, coupled with a decline in storage costs and an increase in high-performance computing solutions have led to an exponential surge in data collected by biomedical scientists and medical practitioners. Interpreting this raw data is a challenging task, and nowhere is this more evident than in the field of opthalmology. The sheer speed at which data on cataracts, diabetic retinopathy, glaucoma and other eye disorders are collected, makes it impossible for the human observer to directly monitor subtle, yet critical details.This book is a novel and well-timed endeavor to present, in an amalgamated format, computational image modeling methods as applied to various extrinsic scientific problems in ophthalmology. It is self-contained and presents a highly comprehensive array of image modeling algorithms and methodologies relevant to ophthalmologic problems. The book is the first of its kind, bringing eye imaging and multi-dimensional hyperspectral imaging and data fusion of the human eye, into focus.The editors are at the top of their fields and bring a strong multidisciplinary synergy to this visionary volume. Their “inverted-pyramid” approach in presenting the content, and focus on core applications, will appeal to students and practitioners in the field.
Download or read book Artificial Intelligence and Ophthalmology written by Parul Ichhpujani and published by Springer Nature. This book was released on 2021-04-22 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book helps to explore the vast expanse of artificial intelligence-based scientific content that has been published in the last few years. Ophthalmology has recently undergone a silent digital revolution, with machine learning and deep learning algorithms consistently outperforming human graders in studies published across the globe. It is high time that a resource that breaks this information behemoth into easily digestible bits comes to the fore. This book simplifies the complex mechanics of algorithms used in ophthalmology and vision science applications. It also tries to address potential ethical issues with machines entering our clinics and patients’ lives. Overall it is essential reading for ophthalmologists/eye care professionals interested in artificial intelligence and everyone who is looking for a deep dive into the exciting world of digital medicine.
Download or read book Artificial Intelligence in Ophthalmology written by Andrzej Grzybowski and published by Springer Nature. This book was released on 2021-10-13 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a wide-ranging overview of artificial intelligence (AI), machine learning (ML) and deep learning (DL) algorithms in ophthalmology. Expertly written chapters examine AI in age-related macular degeneration, glaucoma, retinopathy of prematurity and diabetic retinopathy screening. AI perspectives, systems and limitations are all carefully assessed throughout the book as well as the technical aspects of DL systems for retinal diseases including the application of Google DeepMind, the Singapore algorithm, and the Johns Hopkins algorithm. Artificial Intelligence in Ophthalmology meets the need for a resource that reviews the benefits and pitfalls of AI, ML and DL in ophthalmology. Ophthalmologists, optometrists, eye-care workers, neurologists, cardiologists, internal medicine specialists, AI engineers and IT specialists with an interest in how AI can help with early diagnosis and monitoring treatment in ophthalmic patients will find this book to be an indispensable guide to an evolving area of healthcare technology.
