Time-resolved diffuse optical tomography with patterned-light illumination and detection.

Area of Science:

• Biomedical optics
• Medical imaging
• Photonics

Background:

• Diffuse optical tomography (DOT) is a non-invasive imaging technique.
• Traditional DOT often uses point illumination and detection, which can be time-consuming.
• Developing faster and more efficient DOT strategies is crucial for clinical applications.

Purpose of the Study:

• To investigate the feasibility of time-domain wide-field illumination and detection for DOT.
• To compare wide-field patterned-light strategies with classical point excitation methods.
• To assess the potential for quantitative 3D imaging in thick tissues.

Main Methods:

• Utilizing time-domain wide-field patterned excitation and detection in transmittance geometry.
• Employing time-gated detection channels for enhanced temporal resolution.
• Using a Monte Carlo forward model to compute time-resolved Jacobians for accurate light propagation.
• Performing both in silico and experimental validation.

Main Results:

• Demonstrated the feasibility of reconstructing absorption structures using wide-field patterned-light DOT.
• Showcased superior performance of wide-field strategies over point excitation for comparable data sizes.
• Confirmed retention of time-domain information despite large-area illumination.
• Achieved quantitative 3D imaging in thick tissues with reduced data sets and acquisition times.

Conclusions:

• Time-domain wide-field DOT is a viable and effective imaging modality.
• This approach offers significant advantages in speed and quantitative accuracy compared to conventional methods.
• The technique holds promise for advanced biomedical imaging applications requiring efficient 3D reconstructions.