1 May 2007 Time-resolved optical imager for assessment of cerebral oxygenation
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J. of Biomedical Optics, 12(3), 034019 (2007). doi:10.1117/1.2743964
Abstract
A time-resolved optical instrument allowing for noninvasive assessment of cerebral oxygenation is presented. The instrument is equipped with picosecond diode lasers, fast photodetectors, and time-correlated single photon counting electronics. This technology enables depth-resolved estimation of changes in absorption and, in consequence, assessment of changes in hemoglobin concentrations in the brain cortex. Changes in oxyhemoglobin (HbO2) and deoxyhemoglobin (Hb) can be evaluated selectively in extra- and intracerebral tissue compartments using the moments of distributions of times of flight of photons measured at two wavelengths in the near-infrared region. The combination of the data acquired from multiple sources and detectors located on the surface of the head with the depth-resolved analysis, based on the moments, enables imaging of cortex oxygenation. Results of the tests on physical phantoms as well as in vivo validation of the instrument during the motor stimulation experiment are presented.
Michal Kacprzak, Adam Liebert, Piotr Leszek Sawosz, Norbert S. Zolek, Roman Maniewski, "Time-resolved optical imager for assessment of cerebral oxygenation," Journal of Biomedical Optics 12(3), 034019 (1 May 2007). http://dx.doi.org/10.1117/1.2743964
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KEYWORDS
Photons

Absorption

Imaging systems

Tissue optics

Head

Brain

Tissues

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