Multimodal computational microscopy based on transport of intensity equation

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Computational Microscopy

Background:

• The transport of intensity equation (TIE) is a robust method for phase retrieval and quantitative phase imaging.
• TIE requires only intensity measurements at closely spaced axial planes, eliminating the need for a reference beam and coherent illumination.
• It is compatible with conventional bright-field microscopes, offering broad applicability.

Purpose of the Study:

• To develop a hybrid computational multimodal imaging system based on TIE.
• To enable simultaneous acquisition of quantitative phase, Zernike phase contrast, differential interference contrast, and light field moment images.
• To demonstrate the system's utility for observing biomedical samples and cellular processes.

Main Methods:

• Development of a theoretical framework for a hybrid computational multimodal imaging system.
• Implementation of a tunable lens-based TIE system.
• Application of advanced postprocessing algorithms for image reconstruction and modality emulation.
• Experimental validation using time-lapse imaging of live HeLa cell mitosis.

Main Results:

• The system successfully yields quantitative phase, Zernike phase contrast, differential interference contrast, and light field moment images concurrently.
• Experimental results confirmed the system's capability to achieve diverse imaging modalities in parallel.
• The technique proved effective for dynamic studies of cellular processes, exemplified by live HeLa cell mitosis.

Conclusions:

• The developed hybrid TIE system offers a versatile platform for multimodal imaging.
• It allows computational emulation of various microscopy modalities without specialized hardware.
• This approach facilitates comprehensive dynamic studies of cellular processes, enhancing biomedical research capabilities.