Quantitative 3D imaging of scattering media using structured illumination and computed tomography

Area of Science:

• Optical imaging
• Scattering media analysis
• 3D reconstruction

Background:

• Conventional imaging techniques struggle with multiple scattering and light extinction in turbid media.
• Accurate measurement of extinction coefficients in 3D is crucial for characterizing scattering materials.
• Existing methods are often hampered by artifacts in highly scattering environments.

Purpose of the Study:

• To present and demonstrate a novel 3D imaging technique for measuring extinction coefficients.
• To overcome the limitations of conventional imaging in turbid and scattering media.
• To visualize objects hidden within scattering solutions.

Main Methods:

• Utilizes a novel 'crossed' structured illumination approach for spatial modulation of light.
• Measures 2D transmission at multiple viewing angles using structured illumination.
• Reconstructs the 3D sample using a standard Computed Tomography algorithm.

Main Results:

• The technique accurately measures extinction coefficients in homogeneous milk solutions of varying turbidity.
• Demonstrates the capability to visualize objects concealed within scattering media.
• Successfully applied to inhomogeneous scattering spray systems (transient and quasi-steady state).

Conclusions:

• The developed 3D imaging method effectively measures extinction coefficients in scattering media.
• The approach significantly improves imaging performance in turbid conditions.
• Presents a versatile tool for analyzing complex scattering phenomena in various applications.