scan

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Related to brain scan: PET scan

scan

Med
a. the examination of a part of the body by means of a scanner
b. the image produced by a scanner

scan

[skan]
(computer science)
To examine information, following a systematic, predetermined sequence, for some particular purpose.
(electronics)
The motion, usually periodic, given to the major lobe of an antenna; the process of directing the radio-frequency beam successively over all points in a given region of space.
(engineering)
To examine an area, a region in space, or a portion of the radio spectrum point by point in an ordered sequence; for example, conversion of a scene or image to an electric signal or use of radar to monitor an airspace for detection, navigation, or traffic control purposes.
One complete circular, up-and-down, or left-to-right sweep of the radar, light, or other beam or device used in making a scan.

scan

scan
scanclick for a larger image
Two of the techniques for scanning primary flight instruments.
scanclick for a larger image
Scanning by lobe comparison.
i. To search the sky for any hostile aircraft. The area of the scan for a typical two-aircraft formation is indicated in the illustration. In flight, the term means “Search the sector indicated and report any contacts.”
ii. To make a sweep of selected flight instruments or an external scene with the eyes.
iii. The path periodically followed by a radiation beam. See helical scan and conical scanning.
iv. The motion of an electronic beam through space looking for a target. Scanning is carried out by the motion of the antenna or by lobe switching.

SCAN

(1)
["A Parallel Implementation of the SCAN Language", N.G. Bourbakis, Comp Langs 14(4):239-254 (1989)].

SCAN

(2)
A real-time language from DEC.

scan

(3)
(computer peripheral) See scanner.

scan

(4)
(circuit design) See scan design.

scan

(5)
(functional programming) See scanl, scanr.

scan

(storage, algorithm)
An algorithm for scheduling multiple accesses to a disk. A number of requests are ordered according to the data's position on the storage device. This reduces the disk arm movement to one "scan" or sweep across the whole disk in the worst case. The serivce time can be estimated from the disk's track-to-track seek time, maximum seek time (one scan), and maximum rotational latency.

Scan-EDF is a variation on this.

scan

(1) To make an electronic comparison of a signal, pixel or data structure as described in the following definitions.

(2) In optical technologies, to read a printed form a line at a time in order to convert images into bitmapped representations or convert characters into text. See OCR.

(3) In video, to move across a picture frame a line at a time, either to detect the image in an analog or digital camera, or to refresh a CRT display.

(4) To search a data file sequentially for specific content.

(5) To search an executable file for a particular pattern. See antivirus program.

(6) To sequentially search for peripheral devices attached to the computer.
References in periodicals archive ?
After they did the next brain scan the doctor brought my mum and myself in for a talk.
The brain scans take a matter of minutes and cost between Au100 and Au200.
Chris Bennett, Midland regional manager for the Stroke Association, said failure by hospitals to provide brain scans was putting lives at risk.
Richards said last night: "The brain scan seems to show an abnormality, but I'm waiting for this week's result before I jump to any conclusions.
The children's brain scans showed increased activity in the men that controls language recognition, the study says.
Gary, 40, said: 'I don't know why they wouldn't give Matthew a brain scan.
Any athlete with an abnormality on computed tomography or MRI brain scan consistent with brain swelling, contusion, or other intracranial pathology should be removed from sports activities for the season and discouraged from future return to participation in contact sports.
In one test, a before-and-after procedure called a SPECT brain scan, a patient inhales a radioactive material, making it possible to obtain a color picture of the brain.
The study found no difference in any brain scan measures among the people without memory and thinking impairments, whether or not they had head trauma.
A BRAIN scan study has tracked the course of Alzheimer's disease in an individual patient from early development to death.
Butler brain scan clear MICHAEL BUTLER, the 7lb claiming rider who was badly concussed in a fall at Cork on Saturday, was released from hospital yesterday.
A GRANDMOTHER knocked down in a hit-and-run crash has had to undergo a brain scan.