1. To look at something meticulously in order to detect some particular feature: While they were in the forest, Jim used his binoculars and scanned the trees in order to detect any interesting birds.
2. To inspect reading material in order to single out important information: Susan scanned the directions about her new washing machine in order to see how to use it correctly.
3. To transform an image into a digital form: Betty wanted to scan the article about trees so she could send it via e-mail to her sister.
4. To effectuate an object, a surface, or a part of the body to be examined by an electromagnetic beam: Airports have metal detectors which scan luggage to make sure there are no illegal weapons hidden in them.

A noninvasive ultrasound test for occlusive disease (closure or blockage) of the extracranial (outer skull) carotid artery.

A noninvasive ultrasound test used on the extracranial carotid artery to detect occlusive disease directly.

It is recommended for patients with headaches and neurologic symptoms such as transient ischemic attacks, hemiparesis, paresthesia, and acute speech or visual defects.

1. Scanning in which the required phase or amplitude of the currents fed in the various elements of the antenna array.
2. A target-seeking method in which an operator directs the radar beam by varying the phase or amplitude of the currents flowing into various components of its antenna.

1. Scanning by electronic methods so that substantially uniform coverage of an area is provided by a predetermined pattern of scanning lines.
2. Scanning in which an electron beam, controlled by electric or magnetic fields, is swept over the area under examination, in contrast to mechanical or electromechanical scanning.
3. In telecommunications, the technique of scanning a surface to reproduce or to transmit a picture.
4. In facsimile, a method of scanning in which the motion of the scanning spot is completely controlled by electronic procedures.

1. The moving of an electron beam back and forth and/or up and down by deflecting the beam electromagnetically or electrostatically.
2. A deflection of a beam of electrons, at regular intervals, across a crt screen (display that is electronically created on the surface of the large end of a cathode-ray tube), according to a definite pattern.

An instrument similar to an electron microscope in that a beam of electrons is used to scan the surface of a specimen.

The beam is moved in a point-to-point manner over the surface of the specimen and these electrons are deflected collected, accelerated, and directed against a scintillator.

The large number of photons that are created are converted into an electric signal which, in turn, modulates the beam scanning the surface of the specimen.

1. In a television system, a method by which a spot of light or another energy source moves along a given path by electronic means.
2. In facsimile copying, a method by which a spot on a cathode-ray tube moves across the copy by electronic actions.
3. A method that provides motion of the scanning spot along the scanning line controlled by electronic procedures.
4. Facsimile scanning in which a spot on a cathode-ray tube moves across the copy electronically while the record sheet or subject copy is moved mechanically in a perpendicular direction.

1. A scanning method in which an electrostatic field directs an electron beam.
2. Scanning or the process of directing a radio-frequency beam successively over all points in a given region of space which involves electrostatic deflection of an electron beam.

The process of electronically obtaining and storing human fingerprints.

The digital image obtained by such scanning is called a "finger image". In some texts, the terms fingerprinting and fingerprint are used, but technically, these terms refer to traditional ink-and-paper processes and images.

Fingerscanning is a biometric process, because it involves the automated capture, analysis, and comparison of a specific characteristic of the human body.

There are several different ways in which an instrument can bring out the details in the pattern of raised areas (called ridges) and branches (called bifurcations) in a human finger image.

The most common methods are optical, thermal, and tactile. They work using visible light analysis, heat-emission analysis, and pressure analysis, respectively.

Biometric fingerscanning offers improvements over ink-and-paper imaging. A complete set of fingerscans for a person (10 images, including those of the thumbs) can be easily copied, distributed, and transmitted over computer networks.

In addition, computers can quickly analyze a fingerscan and compare it with thousands of other fingerscans, as well as with fingerprints obtained by traditional means and then digitally photographed and stored. This greatly speeds up the process of searching finger image records in criminal investigations.

1. The process of analyzing the mass spectrum of an ion beam in a mass spectrometer either by changing the electric or magnetic fields of the mass spectrometer or by moving a probe.
2. The process by which the mass spectrum of an ion beam is analyzed, generally by altering the electric or magnetic fields or by moving a probe in a mass spectrometer.

In medicine, the imaging of an entire object, or a cross-sectional slice of the object, at a single moment.

To produce such an image, the data must be recorded quickly over a very short time rather than by accumulation over a longer period.

The technique using a scanning electron microscope on a specimen.