Open Access
25 October 2019 In vivo, noncontact, real-time, PV[O]H imaging of the immediate local physiological response to spinal cord injury in a rat model
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Abstract

We report a small exploratory study of a methodology for real-time imaging of chemical and physical changes in spinal cords in the immediate aftermath of a localized contusive injury. One hundred separate experiments involving scanning NIR images, one-dimensional, two-dimensional (2-D), and point measurements, obtained in vivo, within a 3  ×  7  mm field, on spinal cords surgically exposed between T9 and T10 revealed differences between injured and healthy cords. The collected raw data, i.e., elastic and inelastic emission from the laser probed tissues, combined via the PV[O]H algorithm, allow construction of five images over the first 5 h post injury. Within the larger study, a total of 13 rats were studied using 2-D images, i.e., injured and control. A single 830-nm laser (100-μm diameter round spot) was spatially line-scanned across the cord to reveal photobleaching effects and surface profiles possibly locating a near surface longitudinal artery/vein. In separate experiments, the laser was scanned in two dimensions across the exposed cord surface relative to the injury in a specific pattern to avoid uneven photobleaching of the imaged tissue. The 2-D scanning produced elastic and inelastic emission that allowed construction of PV[O]H images that had good fidelity with the visually observed surfaces and separate line scans and suggested differences between the volume fractions of fluid and turbidity of injured and healthy cord tissue.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Seth Fillioe, Kyle K. Bishop, Alexander V. S. Jannini, John J. I. Kim, Ricky McDonough, Steve Ortiz, Jerry Goodisman, Julie Hasenwinkel, Charles M. Peterson, and Joseph Chaiken "In vivo, noncontact, real-time, PV[O]H imaging of the immediate local physiological response to spinal cord injury in a rat model," Journal of Biomedical Optics 25(3), 032007 (25 October 2019). https://doi.org/10.1117/1.JBO.25.3.032007
Received: 2 July 2019; Accepted: 3 October 2019; Published: 25 October 2019
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CITATIONS
Cited by 3 scholarly publications.
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KEYWORDS
Spinal cord

Injuries

Tissues

In vivo imaging

Raman spectroscopy

Blood

Real time imaging

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