Publicação
Digital Image Sensor Integration in the Scope of EyeFundusScope: a Retinal Imaging System for Mobile Diabetic Retinopathy Assessment
| Resumo: | Diabetic Retinopathy is a pathology, asymptomatic in early stages, that is a consequence of diabetes mellitus, a disease that affects millions of people worldwide. Specifically on people with Diabetic Retinopathy, long periods of hyperglycemia lead to the creation of very fragile blood vessels in the retina, or to the suppression of old ones, leading to problems like hemorrhages or exudates, that may cause blindness. Diabetic Retinopathy can be diagnosed with several devices, but these are mainly too expensive and non-portable, not allowing the screening of a great part of the population. This way, EyeFundusScope was created, being a smartphone based, non-mydriatic, handheld and low-cost Embedded Retinal Imaging System. Image quality depends on the system’s optical alignment and it should provide fundus images with a wide field-of-view. A communication protocol for streaming video and capturing still fundus images, from an UVC-Compliant Camera was developed, after a careful examination of the types of cameras that could be integrated in the system. Such cameras can be placed meticulously in the compact optical system, and suppress issues related to the different specifications of smartphone cameras, that often vary according to the manufacturers. An approach for low level control of high resolution and low cost camera modules was also evaluated. With the system developed, the user can select Internal Fixation Point Actuators, that are extremely important for this diagnosis, since they allow a fixed target for the patient to fixate on, reducing image aberrations due to its eye movement and providing wider field-of-view images. In the future, the UVC-Compliant Camera and Internal Fixation Points Actuators should be integrated on the current prototype, providing an accurate Diabetic Retinopathy screening tool which can enhance the early treatment of the pathology to a greater percentage of the population. |
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| Autores principais: | Piteira, Helena Luís Cortes |
| Assunto: | Diabetic Retinopathy Fundus Camera UVC Compliant Cameras Fixation Targets Mechanical Prototyping |
| Ano: | 2018 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| Resumo: | Diabetic Retinopathy is a pathology, asymptomatic in early stages, that is a consequence of diabetes mellitus, a disease that affects millions of people worldwide. Specifically on people with Diabetic Retinopathy, long periods of hyperglycemia lead to the creation of very fragile blood vessels in the retina, or to the suppression of old ones, leading to problems like hemorrhages or exudates, that may cause blindness. Diabetic Retinopathy can be diagnosed with several devices, but these are mainly too expensive and non-portable, not allowing the screening of a great part of the population. This way, EyeFundusScope was created, being a smartphone based, non-mydriatic, handheld and low-cost Embedded Retinal Imaging System. Image quality depends on the system’s optical alignment and it should provide fundus images with a wide field-of-view. A communication protocol for streaming video and capturing still fundus images, from an UVC-Compliant Camera was developed, after a careful examination of the types of cameras that could be integrated in the system. Such cameras can be placed meticulously in the compact optical system, and suppress issues related to the different specifications of smartphone cameras, that often vary according to the manufacturers. An approach for low level control of high resolution and low cost camera modules was also evaluated. With the system developed, the user can select Internal Fixation Point Actuators, that are extremely important for this diagnosis, since they allow a fixed target for the patient to fixate on, reducing image aberrations due to its eye movement and providing wider field-of-view images. In the future, the UVC-Compliant Camera and Internal Fixation Points Actuators should be integrated on the current prototype, providing an accurate Diabetic Retinopathy screening tool which can enhance the early treatment of the pathology to a greater percentage of the population. |
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