4224 Results of online measurements of retinal vessel diameters on patients
نویسندگان
چکیده
Methods The retinal vessel system is divided in four quadrants, each with five parts of vessels, which consist of parallel connected vessels with similar physiological relations in each case. By means of nonlinear flow pressure relations you can verify in separate vessels bloodflow, velocity of blood, decrease of pressure and flow resistance. Values founded by measurement technique are used as input information to start the simulation.
منابع مشابه
Reduced response of retinal vessel diameters to flicker stimulation in patients with diabetes.
BACKGROUND/AIM Stimulation of the retina with flickering light increases retinal arterial and venous diameters in animals and humans, indicating a tight coupling between neural activity and blood flow. The aim of the present study was to investigate whether this response is altered in patients with insulin dependent diabetes mellitus. METHODS 26 patients with diabetes mellitus with no or mild...
متن کاملEvaluation of the Zeiss retinal vessel analyser.
AIM To investigate the reproducibility and sensitivity of the Zeiss retinal vessel analyser, a new method for the online determination of retinal vessel diameters in healthy subjects. METHODS Two model drugs were administered, a peripheral vasoconstrictor (the alpha receptor agonist phenylephrine) and a peripheral vasodilator (the nitric oxide donor sodium nitroprusside) in stepwise increasin...
متن کاملExtracting Vessel Centerlines From Retinal Images Using Topographical Properties and Directional Filters
In this paper we consider the problem of blood vessel segmentation in retinal images. After enhancing the retinal image we use green channel of images for segmentation as it provides better discrimination between vessels and background. We consider the negative of retinal green channel image as a topographical surface and extract ridge points on this surface. The points with this property are l...
متن کاملMultimodal Retinal Vessel Analysis in CADASIL Patients
PURPOSE To further elucidate retinal findings and retinal vessel changes in Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) patients by means of high resolution retinal imaging. METHODS 28 eyes of fourteen CADASIL patients and an equal number of control subjects underwent confocal scanning laser ophthalmoscopy (cSLO), spectral-domain optica...
متن کاملComputer-assisted methods to evaluate retinal vascular caliber: what are they measuring?
PURPOSE Computer-assisted methods to measure retinal vessel diameters have been incorporated into research, but it is not clear which component of the vessels they are measuring. This study was conducted to compare measurements of retinal vessel diameter by using imaging-processing software on color fundus photographs (FPs) and fluorescein angiographs (FAs). METHODS FP and FA images were take...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Vision Research
دوره 35 شماره
صفحات -
تاریخ انتشار 1995