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Updated: Mar 3, 2026
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Dual-mode Imaging of Cutaneous Tissue Oxygenation and Vascular Function
Published on: December 8, 2010
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Adaptive Optimization of Vascular-Targeted Photodynamic Therapy Efficiency Based on Hyperspectral-Photoacoustic
Rongrui Zhang1, Jingrui Zhao1, Shasha Wang1
1Key Laboratory of Biomedical Information Engineering of Ministry of Education, Institute of Biomedical Photonics and Sensing, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
BME Frontiers
|March 2, 2026
Summary
This study introduces a closed-loop vascular-targeted photodynamic therapy (V-PDT) system. It uses real-time oxygen monitoring to adapt light dosage, preventing hypoxia and improving treatment effectiveness for better cancer therapy.
Area of Science:
- Biomedical Optics
- Photodynamic Therapy
- Medical Imaging
Background:
- Vascular-targeted photodynamic therapy (V-PDT) shows promise for treating tumors and vascular abnormalities.
- Treatment efficacy is often limited by hypoxia caused by rapid oxygen depletion under high light irradiance.
- Real-time monitoring of photosensitizer concentration and blood oxygenation is crucial for optimizing V-PDT but is clinically challenging.
Purpose of the Study:
- To enhance V-PDT efficacy through real-time dosimetric monitoring and adaptive irradiance control.
- To develop a closed-loop, dual-modality optical imaging-guided V-PDT platform.
- To enable individualized, oxygen-informed irradiance control for improved therapeutic precision.
Main Methods:
- Developed a dual-modality imaging system combining hyperspectral imaging (HSI) and optical-resolution photoacoustic microscopy (OR-PAM).
- HSI provided real-time mapping of blood oxygen saturation and photosensitizer concentration.
- OR-PAM offered high-resolution vascular network imaging, guiding a personalized V-PDT protocol with dynamic irradiance modulation based on blood oxygen feedback.
Main Results:
- Dynamic irradiance modulation successfully prevented treatment-induced hypoxia while maintaining therapeutic oxygen levels.
- The personalized V-PDT protocol significantly enhanced therapeutic efficacy compared to fixed-irradiance methods.
- Vascular damage correlated with oxygen-informed irradiance adjustments, as shown by PAM analysis.
Conclusions:
- Integrated real-time dosimetry and feedback-controlled illumination in a closed-loop V-PDT strategy.
- Overcame oxygen depletion limitations, enabling precise and efficient V-PDT tailored to individual tissue responses.
- Demonstrated improved therapeutic precision and efficiency through individualized, oxygen-informed irradiance control.
