Press Release Summary:
"Tissue-Mimicking Phantoms for Photoacoustic and Ultrasonic Imaging," co-authored by Stanislav Emelianov, shows how precise blending of tiny particles and multicolor dyes transforms gelatin into realistic surrogate for human soft tissue. These tissue mimics, or phantoms, provide accurate proving ground for photoacoustic and ultrasonic imaging technologies. Properties were matched by adding 40 micron silica spheres to gelatin, along with emulsion of fat and commercial dyes.
Original Press Release:
Researchers' New Recipe Cooks-up Better Tissue 'Phantoms'
Synthetic human tissue aids in testing photoacoustic and ultrasonic imaging technologies
The precise blending of tiny particles and multicolor dyes transforms gelatin into a realistic surrogate for human tissue. These tissue mimics, known as "phantoms," provide an accurate proving ground for new photoacoustic and ultrasonic imaging technologies. "The ability to provide phantoms that are capable of mimicking desired properties of soft tissue is critical to advance the development of new, more-accurate imaging technologies," said Stanislav Emelianov of the University of Texas at Austin and co-author of a paper appearing in the Optical Society's (OSA) open-access journal Biomedical Optics Express that describes an improved method for fabricating tissue phantoms.
Ultrasonic imaging uses high-frequency acoustic pulses to probe the structure of tissues. Another technique, photoacoustic imaging, uses low-energy laser pulses to create tiny acoustic waves that propagate through tissues. Certain tissues and materials (e.g. blood, nanoparticles used in certain tests, and fluorescent dyes), however, readily absorb the optical wavelengths typically used in photoacoustic imaging. By combining acoustic and photoacoustic imaging techniques, it's possible to create a more comprehensive picture of soft tissues. Designing effective imaging devices that can concurrently harness these two technologies, however, requires true-to-life phantoms. Emelianov and his colleagues have met this need by designing and testing a novel combination of additives that enable gelatin to acquire acoustical and optical properties that accurately match soft tissue in humans.
To match the acoustical properties, the researchers added 40-micron silica spheres to the gelatin. These particles help scatter the acoustical signal, matching the behavior of normal tissue. An emulsion of fat was also used to attenuate, or absorb, the acoustical signal. The fat additive also enhanced optical scattering of the mixture. The final ingredients were commercial dyes - India ink, Direct Red 81, and Evans blue - which provided similar optical absorption to natural tissues.
"These combined characteristics are of particular value because of the growing use of combined ultrasonic and photoacoustic imaging in clinical and preclinical research," says Emelianov. "Furthermore, there has been increased interest in utilizing these combined technologies in clinical applications, such as vascular imaging, lymph node assessment, and atherosclerotic plaque characterization."
Paper: "Tissue-Mimicking Phantoms for Photoacoustic and Ultrasonic Imaging," Biomedical Optics Express, Volume Vol. 2, Issue 11, pp. 3193-3206 (2011).
About Biomedical Optics Express
Biomedical Optics Express is OSA's principal outlet for serving the biomedical optics community with rapid, open-access, peer-reviewed papers related to optics, photonics and imaging in the life sciences. The journal scope encompasses theoretical modeling and simulations, technology development, and biomedical studies and clinical applications. It is published by the Optical Society and edited by Joseph A. Izatt of Duke University. Biomedical Optics Express is an open-access journal and is available at no cost to readers online at http://www.OpticsInfoBase.org/BOE.
Uniting more than 130,000 professionals from 175 countries, the Optical Society (OSA) brings together the global optics community through its programs and initiatives. Since 1916 OSA has worked to advance the common interests of the field, providing educational resources to the scientists, engineers and business leaders who work in the field by promoting the science of light and the advanced technologies made possible by optics and photonics. OSA publications, events, technical groups and programs foster optics knowledge and scientific collaboration among all those with an interest in optics and photonics. For more information, visit www.osa.org.