Search results for " Retinal Vessels"

showing 3 items of 3 documents

Automatic Extraction of Blood Vessels, Bifurcations and End Points in the Retinal Vascular Tree

2008

In this paper we present an effective algorithm for automated extraction of the vascular tree in retinal images, including bifurcations, crossovers and end-points detection. Correct identification of these features in the ocular fundus helps the diagnosis of important systematic diseases, such as diabetes and hypertension. The pre-processing consists in artefacts removal based on anisotropic diffusion filter. Then a matched filter is applied to enhance blood vessels. The filter uses a full adaptive kernel because each vessel has a proper orientation and thickness. The kernel of the filter needs to be rotated for all possible directions. As a consequence, a suitable kernel has been designed …

Cross-correlationPixelAnisotropic Diffusion Matched Filter Retinal Vessels ROC curve.Computer scienceAnisotropic diffusionbusiness.industryQuantitative Biology::Tissues and OrgansMatched filterBinary imageComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONRetinalPattern recognitionchemistry.chemical_compoundTree structurechemistryKernel (image processing)Artificial intelligencebusiness
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Optical coherence tomography angiography evaluation of peripapillary microvascular changes after rhegmatogenous retinal detachment repair

2021

PURPOSE To evaluate the radial peripapillary capillary plexus (RPCP) vessel density (VD) and the retinal nerve fiber layer (RNFL) thickness in eyes successfully treated with pars plana vitrectomy for primary rhegmatogenous retinal detachment. METHODS In this cross-sectional multicenter clinical study, eyes with a minimum 12-month follow-up were reexamined. The RPCP VD and RNFL thickness in the rhegmatogenous retinal detachment subfields of the affected eye (study group) were compared with the corresponding areas of the healthy fellow eyes (control group). RESULTS Fifty-three eyes were included in the study. A significantly lower RPCP VD and RNFL thickness were observed in those subfields af…

MaleRetinal Ganglion Cellsgenetic structuresComputed Tomography Angiographymedicine.medical_treatmentNerve fiber layerVisual AcuityVitrectomyEyeradial peripapillary capillary plexuschemistry.chemical_compoundNerve FibersVitrectomyTomographyRetinal detachment repairRetinal detachmentGeneral MedicineMiddle AgedAxial Length Eyemedicine.anatomical_structureFemaleTomography Optical CoherencePars planamedicine.medical_specialtyBiometryOptic DiskEndotamponaderetinal detachmentOCT-angiography; Radial peripapillary capillary plexus; Retinal detachment; Retinal nerve fiber layer; Aged; Axial Length Eye; Biometry; Cross-Sectional Studies; Endotamponade; Female; Humans; Male; Middle Aged; Nerve Fibers; Optic Disk; Retinal Detachment; Retinal Ganglion Cells; Retinal Vessels; Retrospective Studies; Visual Acuity; Computed Tomography Angiography; Tomography Optical Coherence; VitrectomyOphthalmologymedicineHumansAxial LengthAgedRetrospective StudiesRetinabusiness.industryradial peripapillary capillary plexus; OCT-angiography; retinal nerve fiber layer; retinal detachmentRetinal Vesselsretinal nerve fiber layerRetinalOptical coherence tomography angiographymedicine.diseaseeye diseasesOphthalmologyCross-Sectional StudieschemistryOptical Coherencesense organsOCT-angiographybusiness
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Arterial Hypertension and the Hidden Disease of the Eye: Diagnostic Tools and Therapeutic Strategies.

2022

Hypertension is a major cardiovascular risk factor that is responsible for a heavy burden of morbidity and mortality worldwide. A critical aspect of cardiovascular risk estimation in hypertensive patients depends on the assessment of hypertension-mediated organ damage (HMOD), namely the generalized structural and functional changes in major organs induced by persistently elevated blood pressure values. The vasculature of the eye shares several common structural, functional, and embryological features with that of the heart, brain, and kidney. Since retinal microcirculation offers the unique advantage of being directly accessible to non-invasive and relatively simple investigation tools, the…

Settore MED/14 - Nefrologia...Nutrition and Dieteticsoptical coherence tomographySettore MED/09 - Medicina Internaoptical coherenceSettore MED/30 - Malattie Apparato Visivocoronary circulationmicrocirculationRetinal Vesselstomographyfundus oculivitaminsEyeRetinal Vesseloptical imagingantioxidants; chronic kidney disease; coronary circulation; fundus oculi; hypertension; microcirculation; optical coherence; optical imaging; scanning laser polarimetry; tomography; vitamins; Eye; Humans; Retinal Vessels; Risk Factors; Artificial Intelligence; HypertensionantioxidantsArtificial IntelligenceRisk FactorsHypertensionHumansscanning laser polarimetrychronic kidney diseaseFood ScienceNutrients
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