Elastography is any of a class of medical imaging modalities that map the elastic properties and stiffness of soft tissue. The main idea is that whether the tissue is hard or soft will give diagnostic information about the presence or status of disease. For example, cancerous tumours will often be harder than the surrounding tissue, and diseased livers are stiffer than healthy ones.
An ultrasonic motor is a type of piezoelectric motor powered by the ultrasonic vibration of a component, the stator, placed against another component, the rotor or slider depending on the scheme of operation. Ultrasonic motors differ from other piezoelectric motors in several ways, though both typically use some form of piezoelectric material, most often lead zirconate titanate and occasionally lithium niobate or other single-crystal materials. The most obvious difference is the use of resonance to amplify the vibration of the stator in contact with the rotor in ultrasonic motors. Ultrasonic motors also offer arbitrarily large rotation or sliding distances, while piezoelectric actuators are limited by the static strain that may be induced in the piezoelectric element.
John Lewis "Jan" Hall is an American physicist, and Nobel laureate in physics. He shared the 2005 Nobel Prize in Physics with Theodor W. Hänsch and Roy Glauber for his work in precision spectroscopy.
Doppler echocardiography is a procedure that uses Doppler ultrasonography to examine the heart. An echocardiogram uses high frequency sound waves to create an image of the heart while the use of Doppler technology allows determination of the speed and direction of blood flow by utilizing the Doppler effect.
Walter Guyton Cady was a noted American physicist and electrical engineer. He was a pioneer in piezoelectricity, and in 1921 developed the first quartz crystal oscillator.
Acoustic radiation force (ARF) is a physical phenomenon resulting from the interaction of an acoustic wave with an obstacle placed along its path. Generally, the force exerted on the obstacle is evaluated by integrating the acoustic radiation pressure over its time-varying surface.
A capacitive micromachined ultrasonic transducer (CMUT) is a relatively new concept in the field of ultrasonic transducers. Most of the commercial ultrasonic transducers today are based on piezoelectricity. CMUTs are the transducers where the energy transduction is due to change in capacitance. CMUTs are constructed on silicon using micromachining techniques. A cavity is formed in a silicon substrate, and a thin layer suspended on the top of the cavity serves as a membrane on which a metallized layer acts an electrode, together with the silicon substrate which serves as a bottom electrode.
In scientific visualization a streamlet is used to visualize flows. It is essentially a short streamline segment. Normally the length of a streamlet is proportional to the flow magnitude at its seed point.
Mack Alfred Breazeale was an American physicist particularly known for his work in ultrasonics and physical acoustics. Breazeale is widely regarded as one of the leading acousticians of the 20th century, highly accomplished in both theory and experiment. When he died, he was a retired distinguished research professor and senior scientist at the National Center for Physical Acoustics at the University of Mississippi. Born in Leona Mines, Virginia, Breazeale grew up near Crossville, TN. Educated at Berea College, the Missouri School of Mines, and the Michigan State University, he was a tireless researcher and trained many others in the field of physics. Before his appointment at the National Center for Physical Acoustics, he was professor of physics at the University of Tennessee (1962-1995) and at Michigan State University (1957-1962). A longtime editor of the Journal of the Acoustical Society of America, he was a fellow of the Acoustical Society of America (ASA) and received its Silver Medal in 1988. He was a fellow of the Institute of electrical and Electronics Engineers and Great Britain's Institute of Acoustics, and had been a Fulbright Research Fellow in Stuttgart, Germany early in his career.
Acousto-electronics is a branch of physics, acoustics and electronics that studies interactions of ultrasonic and hypersonic waves in solids with electrons and with electro-magnetic fields. Typical phenomena studied in acousto-electronics are acousto-electric effect and also amplification of acoustic waves by flows of electrons in piezoelectric semiconductors, when the drift velocity of the electrons exceeds the velocity of sound. The term 'acousto-electronics' is often understood in a wider sense to include numerous practical applications of the interactions of electro-magnetic fields with acoustic waves in solids. In particular, these are signal processing devices using surface acoustic waves (SAW), different sensors of temperature, pressure, humidity, acceleration, etc.
IEEE Transactions on Medical Imaging is a monthly peer-reviewed scientific journal published by the Institute of Electrical and Electronics Engineers (IEEE). It covers technological aspects of medical imaging techniques. The journal was established in 1982 and since 2019 the editor-in-chief is Leslie Ying. It is sponsored by four IEEE societies, IEEE Engineering in Medicine and Biology Society, IEEE Signal Processing Society, IEEE Nuclear and Plasma Sciences Society, and IEEE Ultrasonics, Ferroelectrics & Frequency Control Society.
IEEE International Frequency Control Symposium (IFCS) started in 1947 and its name has changed over the years. It is one of the conferences sponsored by the IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society (UFFC-S). IEEE IFCS has been an annual conference since its start in 1947.
Susan Trolier-McKinstry is an American materials scientist. She is the Steward S. Flaschen Professor of Materials Science and Engineering and Electrical Engineering at Pennsylvania State University, Director of the W. M. Keck Smart Materials Integration Laboratory, and co-director of the Nanofabrication facility.
Nazanin Bassiri-Gharb is a mechanical engineer in the field of micro and nano engineering and mechanics of materials. She is the Harris Saunders, Jr. Chair and Professor in the George W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology in Atlanta, Georgia. Bassiri-Gharb leads the Smart Materials, Advanced Research and Technology (SMART) Laboratory at Georgia Tech. Her research seeks to characterize and optimize the optical and electric response of interferometric modulator (IMOD) displays. She also investigates novel materials to improve reliability and processing of IMOD.
Katherine Whittaker Ferrara is an American engineer who is a professor of radiology at Stanford University. Ferrara has been elected a Fellow of the American Association for the Advancement of Science, Institute of Electrical and Electronics Engineers and American Institute for Medical and Biological Engineering.
Dragan Damjanovic is a Swiss-Bosnian-Herzegovinian materials scientist. From 2008 to 2022, he was a professor of material sciences at EPFL and head of the Group for Ferroelectrics and Functional Oxides.
John Vig is a physicist, executive and inventor. His career has been with the U.S. Army Research Lab and he has also been active with the IEEE. He is known for his inventions in UV-ozone cleaning, chemical polishing of quartz surfaces, polyimide bonding of resonators and noise in MEMS.
Gregg E. Trahey is an American biomedical engineer and academic in the field of medical ultrasound. He is the Robert Plonsey Distinguished Professor of Biomedical Engineering at Duke University. In 2022, he was named a fellow of the Institute of Electrical and Electronics Engineers (IEEE) "for contributions to speckle tracking and acoustic radiation force impulse imaging in medical ultrasound".
