Download or read book Assessment of Iris Reflection Artifacts and Alignment in Fundus Images written by Jafet A. Morales and published by . This book was released on 2011 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automatic detection of retinal diseases can reduce the amount of work done by manual image graders. However, the performance of automated techniques is affected by the quality of the digital image. Studies have shown that a significant percentage of retinal images are not of adequate quality for automatic detection of eye diseases, or even for manual grading. This thesis introduces two methods for automatically evaluating two important aspects of quality of retinal images. The first method for fundus image quality assessment detects iris reflection artifacts in the field of view, caused by misalignment of the camera. Detection and segmentation of these artifacts is based on properties of the gradient of intensity in the blue channel over the region covered by these type of artifacts. The results for the proposed method are promising. A sensitivity of 97.2 percent and specificity of 96.9 percent were obtained for detecting halo artifacts with this method. The second method proposed in this thesis evaluates alignment of a fundus image in terms of translation and rotation. These two metrics are calculated after locating two landmarks in the fundus image, the optic disc and the fovea. The optic disc is located by template matching. The acute angle between the horizontal and the segment that joins the optic nerve head (ONH) and fovea is estimated by correlation of an elliptical local vessel density (ELVD) function centered on the optic disc with a template. This angle and the average separation between optic disc and fovea are used to reduce the search space for the fovea. The correlation between translation obtained from the algorithm and translation obtained from the true data is .72. The correlation between rotation obtained from the algorithm and rotation obtained from the true data is also .72, if images where the fovea cannot be located manually and images where the translation algorithm fails are excluded. Possible improvements for alignment evaluation are discussed.
Download or read book Ophthalmic Photography written by Patrick J. Saine and published by Butterworth-Heinemann. This book was released on 1997 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an excellent resource and should be on hand in every office and clinic. Anyone interested in the art and practice of ophthalmic photography should have a copy of this comprehensive and practical book devoted exclusively to both basic and advanced retinal photography techniques, including fundus photography, and retinal and choroidal angiography.
Download or read book High Resolution Imaging in Microscopy and Ophthalmology written by Josef F. Bille and published by Springer. This book was released on 2019-08-13 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book provides a comprehensive overview of the application of the newest laser and microscope/ophthalmoscope technology in the field of high resolution imaging in microscopy and ophthalmology. Starting by describing High-Resolution 3D Light Microscopy with STED and RESOLFT, the book goes on to cover retinal and anterior segment imaging and image-guided treatment and also discusses the development of adaptive optics in vision science and ophthalmology. Using an interdisciplinary approach, the reader will learn about the latest developments and most up to date technology in the field and how these translate to a medical setting. High Resolution Imaging in Microscopy and Ophthalmology – New Frontiers in Biomedical Optics has been written by leading experts in the field and offers insights on engineering, biology, and medicine, thus being a valuable addition for scientists, engineers, and clinicians with technical and medical interest who would like to understand the equipment, the applications and the medical/biological background. Lastly, this book is dedicated to the memory of Dr. Gerhard Zinser, co-founder of Heidelberg Engineering GmbH, a scientist, a husband, a brother, a colleague, and a friend.
Download or read book Retinal Angiography and Optical Coherence Tomography written by J. Fernando Arévalo and published by Springer Science & Business Media. This book was released on 2008-12-02 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: OCT is a relatively new imaging technique that is becoming increasingly popular among ophthalmologists in both private and academic settings. Imaging has been a slow moving area in ophthalmology for some time, but now OCT is providing another, more detailed source of demonstrable change in the eye, in diagnostic, therapeutic or post-surgical setting. OCT and ultrasound both measure advancing disease states and post surgical healing. The difference is that OCT shows more subtle changes, particularly post-surgically.
Download or read book Handbook of Vascular Biometrics written by Andreas Uhl and published by Springer Nature. This book was released on 2020-01-01 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access handbook provides the first comprehensive overview of biometrics exploiting the shape of human blood vessels for biometric recognition, i.e. vascular biometrics, including finger vein recognition, hand/palm vein recognition, retina recognition, and sclera recognition. After an introductory chapter summarizing the state of the art in and availability of commercial systems and open datasets/open source software, individual chapters focus on specific aspects of one of the biometric modalities, including questions of usability, security, and privacy. The book features contributions from both academia and major industrial manufacturers.
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 Anterior Posterior Segment OCT Current Technology Future Applications written by Ashok Garg and published by JP Medical Ltd. This book was released on 2014-01-30 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical coherence tomography (OCT) is a non-invasive imaging test that uses light waves to take cross-section pictures of the retina, the light-sensitive tissue lining the back of the eye (geteyesmart.org). Anterior segment OCT covers structures in front of the vitreous humour – iris, cornea, lens and ciliary body. Posterior segment OCT includes the anterior hyaloid membrane and all the structures behind it – vitreous humour, retina, choroid and optic nerve. This book is a comprehensive guide to the use of OCT in anterior and posterior segment surgery. Beginning with an introduction to the technique, the following chapters examine OCT for numerous different procedures including for corneal disorders, glaucoma, diabetic retinopathy, keratoconus and refractive surgery. The accompanying interactive DVD ROM demonstrates intraoperative use of OCT for different surgical procedures. Key points Comprehensive guide to OCT in anterior and posterior segment surgery Covers numerous procedures for different parts of the eye Interactive DVD ROM demonstrates intraoperative use of OCT Includes nearly 270 clinical photographs, diagrams and tables
Download or read book Optical Coherence Tomography written by Wolfgang Drexler and published by Springer Science & Business Media. This book was released on 2008-12-10 with total page 1346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical coherence tomography (OCT) is the optical analog of ultrasound imaging and is emerging as a powerful imaging technique that enables non-invasive, in vivo, high resolution, cross-sectional imaging in biological tissue. This book introduces OCT technology and applications not only from an optical and technological viewpoint, but also from biomedical and clinical perspectives. The chapters are written by leading research groups, in a style comprehensible to a broad audience.
Download or read book Journal of the Optical Society of America written by and published by . This book was released on 2001 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diagnostic Procedures in Ophthalmology written by HV Nema and published by JP Medical Ltd. This book was released on 2014-05-30 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: New edition presenting latest developments in ophthalmic diagnostic procedures. Fully revised and many new chapters. Previous edition published in 2009.
Download or read book OCT Atlas written by Nagahisa Yoshimura and published by Springer. This book was released on 2014-06-24 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: OCT provided a great advantage over other diagnostic modalities, as it could noninvasively provide tomographic images of the retina of a living eye. As a result, a number of new findings in retinal diseases were made using the time-domain OCT. OCT has now become an essential medical equipment OCT has now become an essential medical equipment in ophthalmic care and quality textbooks describing the functionality of OCT are very important in the education of young ophthalmologists and eye care personnel. In this book are chosen high quality OCT images of rather common diseases as well as images of several rare diseases.
Download or read book Certified Ophthalmic Medical Technologist Exam Review Manual written by Janice K. Ledford and published by SLACK Incorporated. This book was released on 2000 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Basic Bookshelf for Eyecare Professionals is a series that provides fundamental and advanced material with a clinical approach to clinicians and students. A special effort was made to include information needed for the certification exams in ophthalmic and optometric assisting, low vision, surgical assisting, opticianry, and contact lens examiners. The Certified Ophthalmic Medical Technologist Exam Review Manual is a review book designed for those preparing for the COMT® certification exam. This manual offers some 600 multiple-choice questions on every topic listed in the test criteria, including advanced levels of tonometry, visual fields, color vision, clinical optics, motility, photography, pharmacology, and general medical knowledge. Material that is unique to COMTs, such as microbiology and special instruments & techniques, are also covered. Explanatory answers, often with supporting illustrations and tables as well as the reference from which the material was obtained, are offered to round out your study experience. Suggested study texts are listed, along with an appendix on how to take a practical examination.
Download or read book OCT Angiography in Retinal and Macular Diseases written by F. Bandello and published by Karger Medical and Scientific Publishers. This book was released on 2016-03-21 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: In only a short period of time, the innovative procedure of OCT angiography has become an essential macula imaging technique. Now that it is routinely used in clinical practice, the investigation of retinal and choroidal circulation is non-invasive, which significantly changes the professional’s approach to patients. In this volume, retina specialists and renowned experts share their experience with OCT angiography. They have included numerous color images and presented current ideas to form a base for further research and discussion. This book provides retina specialists, ophthalmologists, and researchers with a first glance at original research and clinical reports on this new methodology.
Download or read book Oxford Handbook of Ophthalmology written by Alastair K. O. Denniston and published by Oxford University Press. This book was released on 2018 with total page 1249 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook offers a systematic summary of ophthalmic disease directed towards diagnosis, interim assessment and ongoing management. Now including an extensive online image bank the fourth edition provides rapid access to the information when it is needed, whether in the clinic, theatre or on the ward
Download or read book Scanning Laser Ophthalmoscopy and Tomography written by Joachim E. Nasemann and published by . This book was released on 1990 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retinal Optical Coherence Tomography Image Analysis written by Xinjian Chen and published by Springer. This book was released on 2019-07-05 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the latest optical coherence tomography (OCT) imaging and computerized automatic image analysis techniques, and their applications in the diagnosis and treatment of retinal diseases. Discussing the basic principles and the clinical applications of OCT imaging, OCT image preprocessing, as well as the automatic detection and quantitative analysis of retinal anatomy and pathology, it includes a wealth of clinical OCT images, and state-of-the-art research that applies novel image processing, pattern recognition and machine learning methods to real clinical data. It is a valuable resource for researchers in both medical image processing and ophthalmic imaging.
Download or read book Optical Coherence Tomography of Ocular Diseases written by Joel S. Schuman and published by CRC Press. This book was released on 2024-06-01 with total page 1093 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most comprehensive text and definitive guide for nearly 30 years about optical coherence tomography (OCT) imaging in ophthalmology, Optical Coherence Tomography of Ocular Diseases, Fourth Edition covers a range of subjects, from principles and operation techniques to clinical interpretation and the latest innovations in OCT. Written by the pioneers of OCT technologies and the world-renowned OCT researchers Drs. Joel S. Schuman, James G. Fujimoto, Jay S. Duker, Hiroshi Ishikawa, and Gadi Wollstein, Optical Coherence Tomography of Ocular Diseases, Fourth Edition is an essential text for imaging technology. OCT now occupies a dominant role as a diagnostic tool for retinal conditions and glaucoma. At the same time, the technology continues to show potential for emerging clinical and research applications across all the ophthalmological subspecialties. To reflect these rapid advances, this new edition of Optical Coherence Tomography of Ocular Diseases features a complete and thorough revision of the existing text as well as the addition of cutting-edge content to bring this classic resource completely up to date. New content in the Fourth Edition includes: • OCT angiography • Swept-source OCT • OCT in multimodal imaging • Clinical utility of OCT in glaucoma prediction and progression detection • OCT for neuro-ophthalmology Optical Coherence Tomography of Ocular Diseases, Fourth Edition is the one and only book needed by practitioners who use OCT for clinical eye care.
