Research Papers: General

Monitoring hemodynamic and morphologic responses to closed head injury in a mouse model using orthogonal diffuse near-infrared light reflectance spectroscopy

[+] Author Affiliations
David Abookasis, Ariel Shochat

Ariel University, Department of Electrical and Electronic Engineering, Ariel 40700, Israel

Marlon S. Mathews

University of California Irvine, Department of Neurological Surgery, Medical Center, 101 The City Drive South, Orange, California 92868

J. Biomed. Opt. 18(4), 045003 (Apr 04, 2013). doi:10.1117/1.JBO.18.4.045003
History: Received December 20, 2012; Revised March 6, 2013; Accepted March 7, 2013
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Abstract.  The authors’ aim is to assess and quantitatively measure brain hemodynamic and morphological variations during closed-head injury (CHI) in mice using orthogonal diffuse near-infrared reflectance spectroscopy (o-DRS). CHI is a type of injury to the head that does not penetrate the skull. Usually, it is caused by mechanical blows to the head and frequently occurs in traffic accidents, falls, and assaults. Measurements of brain optical properties, namely absorption and reduced scattering coefficients in the wavelength range from 650 to 1000 nm were carried out by employing different source–detector distance and locations to provide depth sensitivity on an intact scalp over the duration of the whole experiment. Furthermore, alteration in both cortical hemodynamics and morphologic markers, i.e., scattering power and amplitude properties were derived. CHI was induced in anesthetized male mice by a weight-drop model using 50g cylindrical metal falling from a height of 90 cm onto the intact scalp producing an impact of 4500 g cm. With respect to baseline, difference in brain physiological properties was observed following injury up to 1 h post-trauma. Additionally, the reduced scattering spectral shapes followed Mie scattering theory was quantified and clearly shows changes in both scattering amplitude and power from baseline indicating structural variations likely from evolving cerebral edema during CHI. We further demonstrate high correlation between scattering amplitude and scattering power, with more than 20% difference in slope in comparison to preinjury. This result indicates the possibility of using the slope also as a marker for detection of structural changes. Finally, experiments investigating brain function during the first 20 min postinjury were conducted and changes in chromophore concentrations and scattering were observed. Overall, our experiments demonstrate the potential of using the proposed technique as a valuable quantitative noninvasive tool for monitoring brain physiology following CHI injury at the bedside and/or at the field.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

David Abookasis ; Ariel Shochat and Marlon S. Mathews
"Monitoring hemodynamic and morphologic responses to closed head injury in a mouse model using orthogonal diffuse near-infrared light reflectance spectroscopy", J. Biomed. Opt. 18(4), 045003 (Apr 04, 2013). ; http://dx.doi.org/10.1117/1.JBO.18.4.045003


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