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Related Concept Videos

Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...

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Related Experiment Video

Updated: Jun 17, 2026

Doppler Optical Coherence Tomography of Retinal Circulation
10:46

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Published on: September 18, 2012

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Compact Linear Flow Phantom Model for Retinal Blood-Flow Evaluation.

Achyut J Raghavendra1,2, Abdelrahman M Elhusseiny3, Anant Agrawal2

  • 1Department of Ophthalmology and Visual Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA.

Diagnostics (Basel, Switzerland)
|August 10, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel flow phantom to standardize retinal blood flow measurements. This tool enhances the accuracy of ocular imaging techniques, aiding in early diagnosis of eye diseases like glaucoma.

Keywords:
adaptive opticsdiabetic retinopathyglaucomaphantomretinal blood flowscanning laser ophthalmoscopy

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Impaired retinal blood flow is a key indicator of serious ocular diseases including glaucoma, macular degeneration, and diabetic retinopathy.
  • Adaptive optics-scanning laser ophthalmoscopy (AO-SLO) offers high-resolution imaging of retinal microvasculature but faces cross-validation challenges due to instrument and patient variability.
  • Standardized, well-controlled clinical flow phantoms are crucial for validating retinal blood flow measures and establishing them as diagnostic biomarkers.

Purpose of the Study:

  • To design and validate a simple, compact, and portable linear flow phantom for calibrating and evaluating retinal blood flow imaging systems.
  • To provide a standardized tool for improving the accuracy of ocular blood flow measurements.
  • To facilitate the use of blood flow measures as clinical biomarkers for early ocular disease diagnosis.

Main Methods:

  • Development of a linear flow phantom utilizing a direct current motor and conveyor-belt system for tunable velocity (0.5-7 mm/s).
  • Evaluation of the phantom's accuracy using a sensitive AO-SLO line-scan technique.
  • Assessment of the phantom's performance with a clinical SLO instrument to determine correlation with true velocity.

Main Results:

  • The flow phantom demonstrated precise linear velocity control within the physiological range of retinal microvasculature.
  • The AO-SLO technique showed less than 6% standard deviation from the true velocity when using the phantom.
  • A clinical SLO instrument exhibited a strong linear correlation (r² > 0.997) with the phantom's calibrated velocities.

Conclusions:

  • The developed flow phantom serves as a valuable tool for standardizing and enhancing the accuracy of retinal blood flow measurements.
  • This technology has significant potential to improve existing clinical imaging systems for ocular blood flow assessment.
  • The phantom can aid in the early diagnosis of ocular diseases characterized by abnormal retinal blood flow.