Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Novel metamaterial vastly improves quality of ultrasound imaging

This 3D holey-structured metamaterial can improve the resolution of sonagraphy by a factor of 50, promising better picture quality for ultrasound imaging as well as sonar. (Photo by Xiang Zhang/UC Berkeley, courtesy of Nature Physics)
This 3D holey-structured metamaterial can improve the resolution of sonagraphy by a factor of 50, promising better picture quality for ultrasound imaging as well as sonar. (Photo by Xiang Zhang/UC Berkeley, courtesy of Nature Physics)

Abstract:
University of California, Berkeley, scientists have found a way to overcome one of the main limitations of ultrasound imaging - the poor resolution of the picture.

By Robert Sanders, Media Relations

Novel metamaterial vastly improves quality of ultrasound imaging

Berkeley, CA | Posted on November 9th, 2010

Everyone who has had an ultrasound, including most pregnant women, is familiar with the impressionistic nature of the images. One of the limits to the detail obtainable with sonography is the frequency of the sound. The basic laws of physics dictate that the smallest objects you can "see" are about the size of the wavelength of the sound waves. For ultrasound of deep tissues in the body, for example, the sound waves are typically 1-5 megahertz - far higher than what humans can hear - which imposes a resolution limit of about a millimeter.

In a paper appearing online this week in the journal Nature Physics, physicists at UC Berkeley and Universidad Autonoma de Madrid in Spain demonstrate how to capture the evanescent waves bouncing off an object to reconstruct detail as small as one-fiftieth of the wavelength of the sound waves. Evanescent sound waves are vibrations near the object that damp out within a very short distance, as opposed to propagating waves, which can travel over a long distance.

"With our device, we can pick up and transmit the evanescent waves, which contain a substantial fraction of the ultra-subwavelength information from the object, so that we can realize super-resolution acoustic imaging," said first author Jie Zhu, a post-doctoral fellow in the Center for Scalable and Integrated NanoManufacturing (SINAM), a National Science Foundation-funded Nano-scale Science and Engineering Center at UC Berkeley.

The researchers refer to their device for capturing evanescent waves as a three-dimensional, holey-structured metamaterial. It consists of 1,600 hollow copper tubes bundled into a 16 centimeter (6 inch) bar with a square cross-section of 6.3 cm (2.5 inches). Placed close to an object, the structure captures the evanescent waves and pipes them through to the opposite end.

In a practical device, Zhu said, the metamaterial could be mounted on the end of an ultrasound probe to vastly improve the image resolution. The device would also improve underwater sonography, or sonar, as well as non-destructive evaluation in industry applications.

"For ultrasound detection, the image resolution is generally in the millimeter range," said co-author Xiaobo Yin. "With this device, resolution is only limited by the size of the holes."

In the researchers' experiments, the holes in the copper tubes were about a millimeter in diameter. Using acoustic waves of about 2 kHz, the resolution of an image would normally be limited to the wavelength, or 200 millimeters. With their holey-structured metamaterial, they can resolve the feature size as small as 4 mm, or one-fiftieth of a wavelength.

"Without the metamaterial, it would be impossible to detect such a deep sub-wavelength object at all," Yin said.

The work was performed in the laboratory of Xiang Zhang, the Ernest S. Kuh Endowed Chaired Professor in the Department of Mechanical Engineering at UC Berkeley and the director of SINAM. The experiments were based on theoretical predictions of the group led by Professor Francisco J. García-Vidal of the Universidad Autonoma de Madrid. Other co-authors of the paper are J. Christensen of the Universidad Autonoma de Madrid, L. Martin-Moreno of CSIC-Universidad de Zaragoza in Spain, J. Jung from the Aalborg University in Denmark, and L. Fok of SINAM.

The work was funded by the U.S. Office of Naval Research and the Spanish Ministry of Science.

####

For more information, please click here

Copyright © University of California, Berkeley

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

QEOS and GLOBALFOUNDRIES to Offer Industry’s First CMOS Platform for MillimeterWave Markets: GLOBALSOLUTIONSSM Partnership will enable next-generation wireless technologies for applications in IoT, 5G and automotive September 3rd, 2015

GLOBALFOUNDRIES and Catena Partner to Provide Next-Generation RF Connectivity Solutions for Growing Wireless Markets: Catena Wi-Fi and Bluetooth RF technologies available on GLOBALFOUNDRIES 28nm Super Low Power Process technology September 3rd, 2015

Making nanowires from protein and DNA September 3rd, 2015

Making fuel from light: Argonne research sheds light on photosynthesis and creation of solar fuel September 3rd, 2015

Marine/Watercraft

Controlling Dynamic Behavior of Carbon Nanosheets in Structures Made Possible July 30th, 2015

Enhanced Graphene Components for Next Generation Racing Yacht March 5th, 2015

BRAAVOO will design an unmanned surveying vessel and marine buoy that carry biosensors to monitor marine pollutants November 12th, 2014

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Govt.-Legislation/Regulation/Funding/Policy

Making nanowires from protein and DNA September 3rd, 2015

Making fuel from light: Argonne research sheds light on photosynthesis and creation of solar fuel September 3rd, 2015

Reversible Writing with Light: Self-assembling nanoparticles take their cues from their surroundings September 3rd, 2015

Silk bio-ink could help advance tissue engineering with 3-D printers September 2nd, 2015

Possible Futures

Silk bio-ink could help advance tissue engineering with 3-D printers September 2nd, 2015

Sediment dwelling creatures at risk from nanoparticles in common household products August 13th, 2015

Harris & Harris Group Reports Financial Statements as of June 30, 2015, and Announces a Stock Repurchase Program August 10th, 2015

Molecular trick alters rules of attraction for non-magnetic metals August 5th, 2015

Academic/Education

Sustainable nanotechnology center September 1st, 2015

National Science Foundation Selects SUNY Poly CNSE for Expanded $2.1M Northeast Advanced Technological Education Center: NSF Center Locates to NanoCollege in Support of Flourishing Tech Industry in NYS September 1st, 2015

Announcing Oxford Instruments and School of Physics signing a Memorandum of Understanding August 26th, 2015

Kwansei Gakuin University in Hyogo, Japan, uses Raman microscopy to study crystallographic defects in silicon carbide wafers August 25th, 2015

Announcements

QEOS and GLOBALFOUNDRIES to Offer Industry’s First CMOS Platform for MillimeterWave Markets: GLOBALSOLUTIONSSM Partnership will enable next-generation wireless technologies for applications in IoT, 5G and automotive September 3rd, 2015

GLOBALFOUNDRIES and Catena Partner to Provide Next-Generation RF Connectivity Solutions for Growing Wireless Markets: Catena Wi-Fi and Bluetooth RF technologies available on GLOBALFOUNDRIES 28nm Super Low Power Process technology September 3rd, 2015

Making nanowires from protein and DNA September 3rd, 2015

Making fuel from light: Argonne research sheds light on photosynthesis and creation of solar fuel September 3rd, 2015

Tools

Oxford Instruments’ Triton Cryofree dilution refrigerator selected by Oxford University for developing scalable quantum nanodevices September 2nd, 2015

JEOL Introduces New Best-in-Class Field Emission SEM September 2nd, 2015

Atomic Force Microscopes from Asylum Research Guide the Development of Thin Film Deposition and Etch Processes September 2nd, 2015

Nanolab Technologies LEAPS Forward with High-Performance Analysis Services to the World: Nanolab Orders Advanced Local Electrode Atom Probe (LEAP®) Microscope from CAMECA Unit of AMETEK Materials Analysis Division August 27th, 2015

Military

Making nanowires from protein and DNA September 3rd, 2015

Seeing quantum motion August 30th, 2015

These microscopic fish are 3-D-printed to do more than swim: Researchers demonstrate a novel method to build microscopic robots with complex shapes and functionalities August 26th, 2015

Nanotechnology that will impact the Security & Defense sectors to be discussed at NanoSD2015 conference August 25th, 2015

Research partnerships

QEOS and GLOBALFOUNDRIES to Offer Industry’s First CMOS Platform for MillimeterWave Markets: GLOBALSOLUTIONSSM Partnership will enable next-generation wireless technologies for applications in IoT, 5G and automotive September 3rd, 2015

Turning clothing into information displays September 2nd, 2015

Sustainable nanotechnology center September 1st, 2015

$200K Awarded to Develop In Vitro Lung Test for Toxicity of Inhaled Nanomaterials: In Vitro Lung Test Designed to Protect Human Health and Replace Animal Testing September 1st, 2015

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic