Determination of blood flow velocity in vessels of the bulbar conjunctiva

Firago, V. A.; Kubarko, A.; Hotra, O.; Волкова, Ю. В.

doi:10.15199/48.2016.08.29

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…In our case for measuring the morphometric parameters of the vessels of the bulbar conjunctiva of the eye, we use ophthalmology complex which consists of a personal computer, a monochrome camera Imper × 1023 Bobcat IGV-B1410M, a laser device for aiming and focusing the camera on the vessels of the bulbar conjunctiva and a device for synchronizing pulsed illumination with the construction of video frames 15 , having an adjustable frequency and brightness of light. On the basis of this equipment, a sequence of images of the scleral vessels is formed as video where it is possible to monitor changes in the vessels and diagnose pathological processes.…”

Section: Methodsmentioning

confidence: 99%

Automation of flow analysis in scleral vessels based on descriptive-associative algorithms

Kerimkhan

Nedzved

Zhumadillayeva

et al. 2023

Sci Rep

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Blood flow reflects the eye's health and is disrupted in many diseases. Many pathological processes take place at the cellular level like as microcirculation of blood in vessels, and the processing of medical images is a difficult recognition task. Existing techniques for measuring blood flow are limited due to the complex assumptions, equipment and calculations requirements. In this paper, we propose a method for determining the blood flow characteristics in eye conjunctiva vessels, such as linear and volumetric blood speed and topological characteristics of the vascular net. The method preprocesses the video to improve the conditions of analysis and then builds an integral optical flow for definition of flow dynamical characteristic of eye vessels. These characteristics make it possible to determine changes in blood flow in eye vessels. We show the efficiency of our method in natural eye vessel scenes. The research provides valuable insights to novices with limited experience in the diagnosis and can serve as a valuable tool for experienced medical professionals.

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Section: Methodsmentioning

confidence: 99%

Automation of flow analysis in scleral vessels based on descriptive-associative algorithms

Kerimkhan

Nedzved

Zhumadillayeva

et al. 2023

Sci Rep

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Technique for Measuring the Internal Diameter and Area of Visible Vessels of the Eye

Firago

Kubarko

2019

Prib. metody izmer.

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The study of the effects on the microvasculature of various vasoactive drugs requires appro-priate methods and equipment for determining the basic physiological parameters of small blood vessels: their internal diameter and cross-sectional area, specific density, and blood flow velocity. Therefore, the purpose of the article is to study the possibilities of improving the reliability of determining the internal diameter and cross-sectional area of the visible blood vessels of bulbar con-junctival of the eye.A technique for obtaining digital video recordings of the bulbar conjunctiva of the eye, based on the pulse illumination of the study area, is proposed. A prototype of the equipment with a spatial resolution of 2 µm video is described, which allows to trace all visible blood vessels, including capillaries. An algorithm for stabilizing the position of a sequence of digital images of the bulbar conjunctiva relative to the first frame is discussed. It is based on the use of subpixel interpolation when searching for a global minimum of the standard deviation of the differences in brightness of the first and selected frame.The proposed algorithms for tracing the vascular pattern and determining the internal diameter and cross-sectional area of the blood vessels are described. An original method for calculating them is proposed, which is based on determining the area and height of a cross section of a blood vessel image. The problem of verification of the obtained results is discussed.The described approach to make it possible to create diagnostic images of the visible blood vessels of the bulbar conjunctiva, including the capillaries, with an indication of their diameters. Examples of the construction of histograms of the distribution of the internal diameter and cross-sectional area of these blood vessels are presented.The proposed technique and hardware solutions have the prospect of being used in creating equipment for complex non-invasive diagnostics of the microvasculature and monitoring the effectiveness of treating various diseases of the cardiovascular system, since the conditions of the eye blood vessels correlate with the state of the blood vessels in other organs.

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Determination of blood flow velocity in vessels of the bulbar conjunctiva

Cited by 2 publications

References 3 publications

Automation of flow analysis in scleral vessels based on descriptive-associative algorithms

Automation of flow analysis in scleral vessels based on descriptive-associative algorithms

Technique for Measuring the Internal Diameter and Area of Visible Vessels of the Eye

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