The noninvasive, real-time bloodflow monitoring system at Openwater employs the phase-wave laser speckle contrast imaging technique with unprededented depth and blood flow velocity fidelity. This imaging approach requires an illumination system (a pulsed highly coherent infrared laser) and the detection system (a high QE in the infrared camera with pixel sizes close to wavelength of light). A holographic speckle pattern comprises bright and dark spots that arise due to the interference of multiple backscatterd light from scattering medium (biological tissue). The quality of speckle image depends on the coherence and the stablility of the laser used in the system. The test protocols for the coherence and the stability is explained in details in the document "Laser Characterization".
These are the sample data and scripts used in the characterizaton of the lasers.
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interferometer_chirp_test_sample_data.mat - a sample data of the interferometer signal with chirp.
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interferometer_chirp_test.m - a script to analyze the chirp data.
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XIMEA_Speckle_Contrast_7.lua - a script to collect the speckle contrast data on XIMEA camera.
Various sensitive optical equipment are needed to build the blood flow device and evaulate the quality of the laser illumination required. See repo for test and calibration equipment and procedure.
We welcome contributions from the community. If you have ideas for improvements or find any issues, please open an issue or submit a pull request.
Before contributing, please read our Contributing Guidelines.
opw_laser is licensed under the GNU Affero General Public License v3.0. See LICENSE for details.
CAUTION - Investigational device. Limited by Federal (or United States) law to investigational use. opw_laser has not been evaluated by the FDA and is not designed for the treatment or diagnosis of any disease. It is provided AS-IS, with no warranties. User assumes all liability and responsibility for identifying and mitigating risks associated with using this software.