Development Of A Dynamic Test Phantom For Optical Topography

  • Peck H. Koh
  • Clare E. Elwell
  • David T. Delpy
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 645)


Optical topography (OT) is a near infrared spectroscopy (NIRS) technique that provides spatial maps of haemodynamic and oxygenation changes. When developing, testing and calibrating OT systems it is often necessary to use tissue simulating phantoms that are capable of providing realistic changes in attenuation properties. We present a novel dynamic tissue phantom that enables spatially and temporally varying tissue properties to be reproduced in a controlled manner.

This new dynamic test phantom consists of a modified liquid crystal display (LCD) (enabling flexible and rapid changes in attenuation across different regions of the phantom) sandwiched between two layers of tissue simulating epoxy resin (providing static and homogeneous optical absorption and scattering). By activating different pixels in the liquid crystal display it is possible to produce highly localised and dynamic changes in attenuation which can be used to simulate the changes associated with the cerebral haemodynamic response to functional activation. The reproducibility of the dynamic phantom will be described with examples of its use with an OT system.


Liquid Crystal Display Attenuation Property Tissue Phantom Attenuation Region Phantom Material 


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Peck H. Koh
    • 1
  • Clare E. Elwell
    • 1
  • David T. Delpy
    • 1
  1. 1.Department of Medical Physics and BioengineeringUniversity College LondonWC1E 6BTLondon

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