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Related Experiment Videos

A soft deformable tissue-equivalent phantom for diffuse optical tomography.

Jeremy C Hebden1, Ben D Price, Adam P Gibson

  • 1Department of Medical Physics and Bioengineering, University College London, Gower Street, London WC1E 6BT, UK.

Physics in Medicine and Biology
|October 19, 2006
PubMed
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This study details a new recipe for creating highly compressible phantoms using polyvinyl alcohol (PVA) slime for diffuse optical tomography. These stable, customizable phantoms are ideal for calibrating optical tomography systems used on patients with varying body shapes.

Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Materials Science

Background:

  • Diffuse optical tomography (DOT) systems require reliable phantoms for calibration and testing.
  • Existing phantoms may lack the necessary compressibility to accurately simulate patient geometries.
  • Development of deformable phantoms is crucial for advancing DOT applications in clinical settings.

Purpose of the Study:

  • To present a novel recipe for manufacturing highly compressible phantoms for diffuse optical tomography.
  • To characterize the optical properties and stability of these new phantoms.
  • To demonstrate the utility of these phantoms for testing DOT systems on irregular geometries.

Main Methods:

  • Utilizing polyvinyl alcohol (PVA) slime as the base material for its viscoelastic and deformable properties.

Related Experiment Videos

  • Incorporating scattering particles (titanium dioxide or microspheres) and absorbing compounds to achieve desired optical characteristics.
  • Encasing the PVA slime within thin latex shells to create phantoms of arbitrary size and shape.
  • Measuring the transport scatter coefficient in relation to scattering particle concentration.

    • Main Results:

    • A linear relationship was established between scattering particle concentration and the transport scatter coefficient.
    • The PVA slime phantoms exhibited stable and reproducible optical properties.
    • Phantoms demonstrated high compressibility and could be formed into arbitrary shapes.
    • The phantoms maintained stability for at least 3 months.

    Conclusions:

    • A practical and reproducible method for creating highly compressible, optically tunable phantoms has been developed.
    • These deformable phantoms offer a valuable tool for testing and calibrating diffuse optical tomography systems, particularly for patient-specific applications.
    • The PVA slime-based phantoms provide a stable and versatile platform for advancing DOT technology.