A system based on near-infrared light intensity was used to monitor mouse model of traumatic brain injury (TBI) noninvasively. The measurement system was controlled by microcontroller. Light from a 760/850nm dual-wavelength light emitting diode was coupled to a 0.6-mm-diameter optical fiber. The collection fibers were coupled to optoelectronic detectors, which were placed in the different distance from the source fiber. The system consisted of a constant current bias, a circuit lock-in amplifier (including band pass filter, lock-in amplifier, and low pass filter), a PCI 6240 data acquisition card and a multi-core-processor computer. The modified Lambert Beer law was used to calculate the concentration of _ΔHbO₂ and _ΔHb. The sensitivity matrix was defined to evaluate the region of effective detection of optical probe. Five groups of TBI mouse models were built by Feeney's free-falling method. The data measured by system show after TBI the concentration of _ΔHbO₂ decreased and that of _ΔHb increased. It can be concluded that the system can be used to monitor the changes of TBI of mouse non-invasively.

Date Published: 9 February 2012
PDF: 8 pages
Proc. SPIE 8207, Photonic Therapeutics and Diagnostics VIII, 82071N (9 February 2012);

Published in SPIE Proceedings Vol. 8207:
Photonic Therapeutics and Diagnostics VIII
Anita Mahadevan-Jansen; Andreas Mandelis; Kenton W. Gregory M.D.; Nikiforos Kollias; Hyun Wook Kang; Henry Hirschberg M.D.; Melissa J. Suter; Brian Jet-Fei Wong M.D.; Justus F. Ilgner M.D.; Stephen Lam; Bodo E. Knudsen M.D.; Steen Madsen; E. Duco Jansen; Bernard Choi; Guillermo J. Tearney M.D.; Laura Marcu; Haishan Zeng; Matthew Brenner; Krzysztof Izdebski, Editor(s)