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Updated: Aug 12, 2026
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Published on: April 4, 2013
Two-Photon Endomicroscopy for Image-Guided Magnetic Micro-Agents
Juan J Huaroto1, Gert-Willem Römer2, Ivo M Vellekoop3
1Surgical Robotics Laboratory, Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands.
Small (Weinheim an Der Bergstrasse, Germany)
|August 11, 2026
Summary
This study introduces two-photon endomicroscopy (TPE) for real-time imaging of magnetic micro-agents, enabling advanced guidance and analysis in biomedical applications. TPE enhances microrobotic systems with active, image-guided functionality.
Area of Science:
- Biomedical Engineering
- Optical Imaging
- Microrobotics
Background:
- Current microrobotics imaging relies on external modalities, limiting in situ visualization and guidance.
- Endoscopic imaging is an alternative but has been restricted to standard methods in microrobotics.
Purpose of the Study:
- To demonstrate two-photon endomicroscopy (TPE) for real-time fluorescence imaging of magnetically actuated micro-agents.
- To explore TPE's capability for motion analysis, dual-color imaging, and image-guided control in microrobotic systems.
Main Methods:
- Utilized two-photon endomicroscopy (TPE) for fluorescence imaging of magnetic micro-agents.
- Performed dynamic experiments with rotating magnetic fields for motion analysis.
- Employed dual-color imaging to differentiate magnetic and non-magnetic micro-agents.
- Tested imaging penetration through a 140 μm rat mammary gland tissue layer.
Main Results:
- Achieved real-time fluorescence imaging of magnetically actuated micro-agents.
- Enabled motion analysis across various actuation frequencies.
- Successfully imaged mixed populations of magnetic and non-magnetic micro-agents.
- Demonstrated micro-agent detectability through biological tissue.
- Showcased image-guided re-centering of a cell spheroid, compensating for micro-agent displacement.
Conclusions:
- Two-photon endomicroscopy (TPE) is effective for real-time imaging and guidance of magnetic micro-agents.
- TPE extends beyond passive observation to active image-guided functionality in microrobotic systems.
- This advancement holds significant potential for minimally invasive biomedical applications.
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