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Measuring optical temperature coefficients of Intralipid
V Andrew McGlone1, Paul Martinsen, Rainer Künnemeyer
1The Food and Horticulture Research Institute of New Zealand, Hamilton, New Zealand. amcglone@hortresearch.co.nz
Physics in Medicine and Biology
|April 19, 2007
Summary
This study measured how temperature affects light absorption and scattering in Intralipid. Unexpected scattering changes were observed, suggesting temperature can help test instrument performance.
Area of Science:
- Biomedical Optics
- Photonics
- Optical Phantoms
Background:
- Accurate optical properties of phantoms are crucial for biomedical optics research.
- Intralipid is a common liquid phantom used to mimic biological tissue.
- Understanding temperature effects on phantom optical properties is essential for reliable measurements.
Purpose of the Study:
- To determine the temperature sensitivities of absorption and reduced scattering coefficients of Intralipid.
- To investigate the relationship between temperature, wavelength, and optical properties.
- To evaluate the utility of temperature perturbations for assessing instrument performance.
Main Methods:
- Spatially resolved continuous wave measurements were performed.
- A 10 L volume of 1% Intralipid was subjected to a controlled cooling regime (40-30°C).
- Absorption and reduced scattering coefficients were analyzed across the 700-1000 nm wavelength range.
Main Results:
- Temperature sensitivities of absorbance coefficients were comparable to pure water.
- Reduced scattering coefficients exhibited higher sensitivity to temperature than predicted by density changes alone.
- An unexpected wavelength-dependent relationship was observed for the reduced scattering coefficients.
Conclusions:
- Temperature significantly influences the optical properties of Intralipid, particularly scattering.
- The observed scattering behavior deviates from simple density-based predictions.
- Temperature variations can serve as a valuable tool for validating the performance of optical measurement instruments.
