Diffraction imaging of spheres and melanoma cells with a microscope objective

Area of Science:

• Optical microscopy
• Biophysics
• Cell biology

Background:

• Diffraction imaging offers a label-free method for analyzing microscale structures.
• Understanding the relationship between 3D morphology and optical scattering is crucial for biological imaging.
• Mie theory provides a theoretical basis for interpreting light scattering from spherical particles.

Purpose of the Study:

• To investigate diffraction imaging of polystyrene spheres and B16F10 mouse melanoma cells.
• To compare experimental diffraction images with Mie theory predictions.
• To establish a model for correlating 3D cell morphology with diffraction imaging data.

Main Methods:

• Utilized a microscope objective for diffraction imaging of embedded spheres and cells.
• Translated the objective to defocused positions to acquire diffraction images.
• Employed a confocal imaging-based method for 3D structure reconstruction and analysis.
• Investigated genetically modified B16F10 mouse melanoma cells.

Main Results:

• Diffraction images of spheres matched Mie theory projections when the objective was defocused.
• Genetic modifications induced significant morphological changes in B16F10 cells.
• Demonstrated the utility of modified cells as a model for studying morphology-diffraction correlations.

Conclusions:

• Diffraction imaging, particularly with defocused objectives, can effectively capture structural information comparable to Mie theory.
• Genetically modified melanoma cells provide a valuable experimental system for exploring the link between 3D structure and optical properties.
• This approach facilitates the study of morphology-dependent features in biological samples using diffraction imaging.