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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
Published on: June 16, 2023
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Organosilicon phantom for photoacoustic imaging
Cinzia Avigo1, Nicole Di Lascio2, Paolo Armanetti3
1Istituto di Fisiologia Clinica, CNR, Via Giuseppe Moruzzi 1, Pisa 56124, Italy.
Journal of Biomedical Optics
|April 21, 2015
Summary
Researchers developed a new polydimethylsiloxane (PDMS) phantom for photoacoustic imaging. This stable phantom significantly improves image quality, offering a promising tool for evaluating photoacoustic systems and modeling vascularized tissues.
Area of Science:
- Biomedical Engineering
- Optical Imaging
- Materials Science
Background:
- Photoacoustic imaging is an emerging technology with commercial systems available, but it is still in its early stages of development.
- Stable phantoms are crucial for the semiquantitative assessment of photoacoustic imaging system performance and for optimizing contrast agents.
- Existing phantom materials may not offer the required precision for advanced evaluations.
Purpose of the Study:
- To design and develop a novel polydimethylsiloxane (PDMS) phantom with fine geometry for photoacoustic imaging applications.
- To evaluate the performance of the PDMS phantom in comparison to traditional agar phantoms.
- To assess the potential of PDMS phantoms as tissue-mimicking materials for photoacoustic testing.
Main Methods:
- A polydimethylsiloxane (PDMS) phantom with exceptionally fine geometry was fabricated.
- Photoacoustic experiments were conducted using indocyanine green dye and polyethylene glycol-gold nanorods.
- Image quality parameters, including signal-to-noise ratio and contrast, were measured and compared between PDMS and agar phantoms.
- A tissue-mimicking (TM)-PDMS phantom was created by incorporating TiO2 and India ink for comparison with biological tissue.
Main Results:
- The PDMS phantom demonstrated enhanced image quality compared to the agar phantom, with signal-to-noise ratio improvements of up to 50% and contrast enhancements of up to 300%.
- The linearity of the photoacoustic signal with nanoparticle concentration was successfully assessed using the PDMS phantom.
- The TM-PDMS phantom showed comparable photoacoustic signal generation to biological tissues, validating its use as a tissue-mimicking material.
Conclusions:
- The developed PDMS phantom offers superior performance for photoacoustic imaging evaluations due to its fine geometry and enhanced image quality.
- PDMS phantoms are a promising tool for assessing photoacoustic system performance and optimizing contrast agents.
- The tissue-mimicking PDMS phantom serves as a valuable model for studying the structure of vascularized soft tissues in photoacoustic imaging.
