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Ultrasound
Ultrasound is sound with a
frequency greater than the
upper limit of human
hearing, approximately 20
kilohertz (20,000 hertz).
Some animals, such as dogs,
dolphins, bats, and mice
have an upper limit that is
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Doppler effect
The Doppler effect, named
after Christian Andreas
Doppler, is the apparent
change in frequency or
wavelength of a wave that is
perceived by an observer
moving relative to the
source of the waves. The
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Acoustics
Acoustics is the branch of
physics concerned with the
study of sound (mechanical
waves in gases, liquids, and
solids). A scientist who
works in the field of
acoustics is an acoustician.
The application of acoustics
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Videoconferencing
A videoconference (also
known as a
videoteleconference) is a
set of interactive
telecommunication
technologies which allow two
or more locations to
interact via two-way video
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Browse Reference Articles
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Flow measurement
Flow measurement is the quantification of bulk fluid or gas movement. Volumetric flow rate is sometimes measured in "standard cubic centimeters per minute" (abbreviation sccm), a unit acceptable for ... > more -
Radiography
Radiography is the creation of images by exposing a photographic film or other image receptor to X-rays. Since X-rays penetrate solid objects, but are weakened by them depending on the object's ... > more -
Positron emission tomography
Positron emission tomography (PET) is a nuclear medicine medical imaging technique which produces a three dimensional image or map of functional processes in the body. PET is both a medical and ... > more -
Sulfur hexafluoride
Sulfur hexafluoride (SF6) is a gas whose molecules consist of one sulfur atom and six fluorine atoms. It is colorless, odorless, non-toxic, and non-flammable, and is soluble in water and some other ... > more -
Medical Devices
Medical Technology
Medical Imaging
Healthy Aging
Today's Healthcare
Attention Deficit Disorder
Magnetic resonance imaging
Magnetic Resonance Imaging (MRI), formerly referred to as Magnetic Resonance Tomography (MRT) or Nuclear Magnetic Resonance (NMR), is a method used to visualize the inside of living organisms as well ... > more -
Healthy Aging
Attention Deficit Disorder
Medical Technology
Medical Devices
Medical Imaging
Sports Science
Computed tomography
Computed tomography (CT), originally known as computed axial tomography (CAT) and body section roentgenography, is a medical imaging method employing tomography where digital geometry processing is ... > more -
Speed of sound
The speed of sound is a term used to describe the speed of sound waves passing through an elastic medium. The speed varies with the medium employed (for example, sound waves move faster through water ... > more -
Confocal laser scanning microscopy
Confocal laser scanning microscopy (CLSM or LSCM) is a valuable tool for obtaining high resolution images and 3-D reconstructions. The key feature of confocal microscopy is its ability to produce ... > more -
Spectroscopy
Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency. Spectroscopy is often used in physical and analytical chemistry for the identification of ... > more
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