Ms. Daria C. Comsa Profile

Daria C. Comsa

at Juravinski Cancer Ctr

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Proceedings Article | 11 July 2007 Paper

Post mortem evaluation of a new approach for quantitative bioluminescence imaging in small animals

D. Comsa, T. Farrell, M. Patterson

Proceedings Volume 6626, 662608 (2007) https://doi.org/10.1117/12.727502

KEYWORDS: Optical properties, Bioluminescence, Optical testing, Tissues, In situ metrology, Skin, Tissue optics, Animal model studies, Reflectivity, Natural surfaces

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We report the performance of a simple method for making quantitative bioluminescence measurements of a point-like source embedded in small animals. In this method, video reflectometry is first used to obtain an estimate of the in situ optical properties of the tissue containing the bioluminescent source. A 2-dimensional image of the bioluminescence signal emitted from the surface of the animal is then acquired with a CCD. Using the measured optical properties, and a simple diffusion theory model, an inversion algorithm is applied to retrieve the source depth and power from a region of interest of the bioluminescence images. Two major factors determine the accuracy of the reconstruction: tissue heterogeneity and curvature of the imaged surface. The use of measured optical properties to characterize in situ tissue surmounts, to a degree, the heterogeneity problem: post mortem data from rats show that the relative power can be retrieved within a factor of 2 and frequently within 20 %, and the depth within 1.0 mm for implanted depths of 4-10 mm, when the curvature effects were eliminated. For depths shallower than 4 mm, the errors in the retrieved depth are consistently larger.

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