Research Papers

Time-resolved optical imager for assessment of cerebral oxygenation

[+] Author Affiliations
Michal Kacprzak, Adam Liebert, Piotr Sawosz, Norbert Żolek, Roman Maniewski

Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02-109 Warsaw, Poland

J. Biomed. Opt. 12(3), 034019 (May 31, 2007). doi:10.1117/1.2743964
History: Received November 27, 2006; Revised January 31, 2007; Accepted February 05, 2007; Published May 31, 2007
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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.

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© 2007 Society of Photo-Optical Instrumentation Engineers


Michal Kacprzak ; Adam Liebert ; Piotr Sawosz ; Norbert Żolek and Roman Maniewski
"Time-resolved optical imager for assessment of cerebral oxygenation", J. Biomed. Opt. 12(3), 034019 (May 31, 2007). ; http://dx.doi.org/10.1117/1.2743964

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