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Published on: May 4, 2011
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Absolute Quantitative Photoacoustic Imaging for Contrast Agents Concentration Estimation Using a Spectral
Shang Gao1, Liudmila Serebrennikova2, Ryo Murakami1
1Department of Robotics Engineering, Worcester Polytechnic Institute, Worcester, MA, USA.
Molecular Imaging
|March 4, 2026
Summary
This study introduces a spectral decomposition method to improve photoacoustic imaging quantification of contrast agents. The new technique enhances accuracy for medical diagnostics and therapeutic monitoring.
Area of Science:
- Biomedical Imaging
- Medical Diagnostics
- Optical Imaging
Background:
- Photoacoustic (PA) imaging offers diagnostic potential but struggles with accurate contrast agent (CA) quantification.
- Nonlinear signal responses and spectral shifts at varying concentrations limit clinical utility.
Purpose of the Study:
- To develop a spectral decomposition method for improved absolute CA concentration estimation in PA imaging.
- To overcome limitations of traditional intensity-based quantification methods.
Main Methods:
- Utilized a reference spectral library for spectral decomposition.
- Corrected for signal distortions and nonlinear behavior in PA signals.
- Validated using in vitro experiments with a PSMA-targeted CA and dynamic tracking of ICG in ex vivo tissue.
Main Results:
- Achieved significantly lower concentration estimation errors: 1.80 µM in saline and 3.34 µM in blood.
- Demonstrated enhanced reliability and robustness compared to conventional techniques.
- Successfully validated the spectral-based quantification in different biological environments.
Conclusions:
- The spectral decomposition method offers precise and robust CA quantification in PA imaging.
- This technique holds potential for clinically translatable PA imaging applications.
- Enables accurate CA measurement for early disease detection, surgical guidance, and therapeutic monitoring.
