Cross-wavelength calibrating method for real-time imaging of tissue optical properties using frequency-domain diffuse...

Area of Science:

• Biomedical Optics
• Medical Imaging
• Spectroscopy

Background:

• Frequency-domain diffuse optical spectroscopy (FD-DOS) is crucial for non-invasive tissue optical property assessment.
• Existing methods can be sensitive to optical coupling variations and motion artifacts.
• Real-time tissue characterization demands robust and accurate measurement techniques.

Purpose of the Study:

• Introduce and validate the novel cross-wavelength calibrating (CWC) method for FD-DOS.
• Enhance the accuracy and reliability of tissue optical property measurements.
• Simplify FD-DOS instrumentation and reduce costs compared to traditional methods.

Main Methods:

• Developed the CWC method integrated into the TrackDOSI real-time FD-DOS imaging system.
• Validated the CWC method using solid silicone phantoms.
• Tested the CWC method on phantom and human tissues to assess artifact suppression and repeatability.

Main Results:

• CWC method showed strong agreement with the gold standard self-calibrating (SC) method on phantoms (-10% absorption, 1% reduced scattering).
• Demonstrated effective suppression of motion artifacts and optical coupling variations.
• Improved measurement repeatability, signal fidelity, and artifact correction in dynamic imaging.

Conclusions:

• The CWC method offers a simpler, more robust, and cost-effective alternative to traditional SC methods.
• CWC enhances the accuracy and reliability of FD-DOS measurements in challenging conditions.
• This technique holds significant potential for improving the clinical utility of diffuse optical spectroscopy imaging.