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Acoustic characterization and contrast imaging of microbubbles encapsulated by polymeric shells coated or filled with magnetic nanoparticles.

Identifieur interne : 000614 ( Main/Exploration ); précédent : 000613; suivant : 000615

Acoustic characterization and contrast imaging of microbubbles encapsulated by polymeric shells coated or filled with magnetic nanoparticles.

Auteurs : Claudia Sciallero [Italie] ; Dmitry Grishenkov ; Satya V V N. Kothapalli ; Letizia Oddo ; Andrea Trucco

Source :

The Journal of the Acoustical Society of America ; 2013.

RBID : pubmed:24180801

English descriptors

KwdEn :
- Acoustics, Contrast Media (chemistry), Magnetic Resonance Imaging (instrumentation), Magnetite Nanoparticles (chemistry), Microbubbles, Nonlinear Dynamics, Phantoms, Imaging, Polyvinyl Alcohol (chemistry), Pressure, Scattering, Radiation, Ultrasonography (instrumentation).
MESH :
- chemical , chemistry : Contrast Media, Magnetite Nanoparticles, Polyvinyl Alcohol.
- instrumentation : Magnetic Resonance Imaging, Ultrasonography.
- Acoustics, Microbubbles, Nonlinear Dynamics, Phantoms, Imaging, Pressure, Scattering, Radiation.

Abstract

The combination of superparamagnetic iron oxide nanoparticles with polymeric air-filled microbubbles is used to produce two types of multimodal contrast agents to enhance medical ultrasound and magnetic resonance imaging. The nanoparticles are either covalently linked to the shell or physically entrapped into the shell. In this paper, the characterization of the acoustic properties (backscattered power, fracturing pressure, attenuation and dispersion of the ultrasonic wave) and ultrasound imaging of the two types of magnetic microbubbles are presented. In vitro B-mode images are generated using a medical ultrasound scanner by applying a nonconventional signal processing technique that is suitable to detect polymeric bubbles and based on the combination of multipulse excitation and chirp coding. Even if both types of microbubbles can be considered to be effective ultrasound contrast agents, the different structure of the shell loaded with nanoparticles has a pronounced effect on the echogenicity and the detection sensitivity of the imaging technique. The best results are obtained using microbubbles that are externally coated with nanoparticles. A backscattered power of 20 dB was achieved at lower concentration, and an increment of 8 dB in the contrast-to-tissue ratio was observed with respect to the more rigid microbubbles with particles entrapped into the shell.

DOI: 10.1121/1.4824337
PubMed: 24180801

Affiliations:

Italie

Le document en format XML

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<affiliation wicri:level="1"><nlm:affiliation>Department of Electrical, Electronic, Telecommunication Engineering and Naval Architecture, University of Genoa, Via Opera Pia 11, 16145 Genoa, Italy.</nlm:affiliation>
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<author><name sortKey="Grishenkov, Dmitry" sort="Grishenkov, Dmitry" uniqKey="Grishenkov D" first="Dmitry" last="Grishenkov">Dmitry Grishenkov</name>
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<author><name sortKey="Kothapalli, Satya V V N" sort="Kothapalli, Satya V V N" uniqKey="Kothapalli S" first="Satya V V N" last="Kothapalli">Satya V V N. Kothapalli</name>
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<author><name sortKey="Kothapalli, Satya V V N" sort="Kothapalli, Satya V V N" uniqKey="Kothapalli S" first="Satya V V N" last="Kothapalli">Satya V V N. Kothapalli</name>
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<series><title level="j">The Journal of the Acoustical Society of America</title>
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<term>Nonlinear Dynamics</term>
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<term>Polyvinyl Alcohol (chemistry)</term>
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<front><div type="abstract" xml:lang="en">The combination of superparamagnetic iron oxide nanoparticles with polymeric air-filled microbubbles is used to produce two types of multimodal contrast agents to enhance medical ultrasound and magnetic resonance imaging. The nanoparticles are either covalently linked to the shell or physically entrapped into the shell. In this paper, the characterization of the acoustic properties (backscattered power, fracturing pressure, attenuation and dispersion of the ultrasonic wave) and ultrasound imaging of the two types of magnetic microbubbles are presented. In vitro B-mode images are generated using a medical ultrasound scanner by applying a nonconventional signal processing technique that is suitable to detect polymeric bubbles and based on the combination of multipulse excitation and chirp coding. Even if both types of microbubbles can be considered to be effective ultrasound contrast agents, the different structure of the shell loaded with nanoparticles has a pronounced effect on the echogenicity and the detection sensitivity of the imaging technique. The best results are obtained using microbubbles that are externally coated with nanoparticles. A backscattered power of 20 dB was achieved at lower concentration, and an increment of 8 dB in the contrast-to-tissue ratio was observed with respect to the more rigid microbubbles with particles entrapped into the shell.</div>
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<name sortKey="Kothapalli, Satya V V N" sort="Kothapalli, Satya V V N" uniqKey="Kothapalli S" first="Satya V V N" last="Kothapalli">Satya V V N. Kothapalli</name>
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<country name="Italie"><noRegion><name sortKey="Sciallero, Claudia" sort="Sciallero, Claudia" uniqKey="Sciallero C" first="Claudia" last="Sciallero">Claudia Sciallero</name>
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Acoustic characterization and contrast imaging of microbubbles encapsulated by polymeric shells coated or filled with magnetic nanoparticles.

Acoustic characterization and contrast imaging of microbubbles encapsulated by polymeric shells coated or filled with magnetic nanoparticles.

Source :

English descriptors

Abstract

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Le document en format XML

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