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A scattering phase function for blood with physiological haematocrit.

M Hammer1, A N Yaroslavsky, D Schweitzer

  • 1University of Jena, Department of Ophthalmology, Germany. martin.hammer@med.uni-jena.de

Physics in Medicine and Biology
|March 30, 2001
PubMed
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An effective scattering phase function for whole blood is crucial. This study found the Henyey-Greenstein phase function with an anisotropy factor of 0.972 adequately approximates whole blood optics at high hematocrit.

Area of Science:

  • Biomedical Optics
  • Light Scattering
  • Blood Physiology

Background:

  • Optics of red blood cells and whole blood are extensively studied.
  • An effective scattering phase function for whole blood is still needed.
  • Single erythrocyte models may fail in concentrated suspensions.

Purpose of the Study:

  • To determine an effective scattering phase function for whole blood.
  • To compare goniophotometric measurements with Monte Carlo simulations.
  • To validate scattering models for physiological hematocrit.

Main Methods:

  • Goniophotometric measurements of blood samples.
  • Angle-resolved Monte Carlo simulations.
  • Comparison of experimental and simulation results.

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Main Results:

  • The Henyey-Greenstein phase function is proposed.
  • An anisotropy factor of 0.972 was determined.
  • This model adequately approximates whole blood scattering at 514 nm.

Conclusions:

  • The Henyey-Greenstein phase function is suitable for whole blood.
  • Accurate scattering phase functions are vital for blood optics research.
  • This finding aids in modeling light transport in blood.