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Fluorescence and absorption contrast mechanisms for biomedical optical imaging using frequency-domain techniques
E M Sevick-Muraca1, G Lopez, J S Reynolds
1School of Chemical Engineering, Purdue University, West Lafayette, IN, USA. biospec@ecn.purdue.edu
Photochemistry and Photobiology
|July 1, 1997
Summary
Fluorescent contrast agents outperform light-absorbing ones for deep tissue imaging. Their effectiveness in detecting diseased tissues depends on uptake, optical properties, and fluorescence dynamics.
Area of Science:
- Biomedical Optics
- Medical Imaging
- Fluorescence Spectroscopy
Background:
- Optical imaging of deep tissues relies on local optical property contrast.
- Exogenous contrast agents enhance detection of diseased tissue volumes.
Purpose of the Study:
- To compare fluorescent contrast agents with light-absorbing agents for deep tissue imaging.
- To investigate factors influencing contrast in fluorescence-based detection.
Main Methods:
- Utilized time-dependent measurements and tissue phantom studies.
- Experimentally evaluated near-infrared-absorbing and fluorescent dyes (e.g., indocyanine green).
- Assessed the impact of dye partitioning, quantum yield, and lifetime on contrast.
Main Results:
- Fluorescent compounds provide superior exogenous contrast compared to nonfluorescing agents.
- Successful detection of diseased tissue volumes was achieved using fluorescence measurements at tissue periphery.
- Contrast was demonstrated with 10-fold to 100-fold partitioning of fluorescent agents in diseased tissues.
- Contrast is modulated by preferential uptake, optical properties, and fluorescence dynamics.
Conclusions:
- Fluorescence-based imaging offers a powerful approach for detecting deep-seated diseased tissues.
- The choice of fluorescent agent and its interaction with the tissue environment are critical for effective imaging.
- Quantitative fluorescence measurements can enable sensitive detection of disease with appropriate contrast agents.