نتایج جستجو برای: retinal blood vessels
تعداد نتایج: 782281 فیلتر نتایج به سال:
Segmentation of blood vessels in retinal images provides early diagnosis of diseases like glaucoma, diabetic retinopathy and macular degeneration. Among these diseases occurrence of Glaucoma is most frequent and has serious ocular consequences that can even lead to blindness, if it is not detected early. The clinical criteria for the diagnosis of glaucoma include intraocular pressure measuremen...
Vessel cross-sectional diameter is an important feature for analyzing retinal vascular changes. In automated retinal image analysis, the measurement of vascular width is a complex process as most of the vessels are few pixels wide or suffering from lack of contrast. In this paper, we propose a new method to measure the retinal blood vessel diameter which can be used to detect arteriolar narrowi...
MICHAELSON (1954), writing on the retinal blood vessels in man, stated that "an artery crossing an artery, or a vein crossing a vein, has not once been reported, or been personally observed". This is in keeping with the present hypothesis that the development of retinal vessels in vertebrates is stimulated by a local intraretinal factor. In man, each quadrant of the fundus accumulates, during d...
It has been found that retinal arterial reactivity to oxygen is diminished in persons with retinal arteriosclerosis, and that cerebral blood flow and the increment in cerebral flow upon inhalation of carbon dioxide are diminished in persons with cerebral arteriosclerosis. The present study demonstrates that there is a significant positive correlation between retinal arterial reactivity on the o...
Vessel diameter is an important factor for indicating retinal microvascular signs. In automated retinal image analysis, the measurement of vascular width is a complicated process as most of the vessels are few pixels wide. In this paper, we propose a new technique to measure the retinal blood vessel diameter which can be used to detect arteriolar narrowing, arteriovenous (AV) nicking, branching...
Blood vessel in retinal image plays a vital role in medical diagnosis of many diseases. Diabetic retinopathy is one of the diseases which damages the retina and leads to blindness. Segmentation of blood vessels is helpful for ophthalmologists and this paper presents a new automatic method to extract blood vessels with high accuracy. This algorithm is comprised of optimized Gabor filter with loc...
In this paper, we demonstrate a comprehensive method for segmenting the retinal vasculature in camera images of the fundus. This is of interest in the area of diagnostics for eye diseases that affect the blood vessels in the eye. In a departure from other state-of-the-art methods, vessels are first pre-grouped together with graph partitioning, using a spectral clustering technique based on morp...
THERE is convincing clinical evidence that retrolental fibroplasia is the result of a disturbance of the oxygen conditions to which an infant is normally exposed. Direct experimental evidence of this was supplied by Ashton and others (1953), the anatomical studies of Michaelson (1948) and the physiological studies of Campbell (1951) having previously suggested the significance of the role of ox...
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