scan

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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 ?
We also looked at the BMD values obtained from the DEXA scan at the lumbar spine and the greater trochanter and compared them to various factors in the male and female subjects.
DEXA is the gold standard to predict fracture risk, but optimal sites of bone and reference population are key to diagnosing osteoporosis, suggesting that DEXA scans may not be able to accurately predict fracture risk.
Participants had baseline DEXA scans, which were repeated at years 2, 6, 8, 10, and 16.
Based on current evidence and expert opinion, and where feasible, baseline DEXA scans should be done in clients with a family history of osteoporosis and/or a pathological fracture.
Three antiretroviral-related risk factors also raised the risk of osteopenia or osteoporosis in this analysis: longer time taking a PI, taking a PI at the time of the last DEXA scan, and taking Viread at the last DEXA scan.
Dual energy X-ray Absorbsiometry (DEXA) Measurement: DEXA scan were performed in the medical physics department of Sunderland Royal Hospital.
Currently, doctors don't know what the results mean from the DEXA scans of men, she says.
She added that DEXA scans are warranted in children with osteogenesis imperfecta, fibrous dysplasia, or chronic diseases linked to bone risk; those with low-impact fractures; and those who have osteopenia observed on x-ray.
First, you should have a DEXA Scan to make sure you do not have osteoporosis, as well as a complete evaluation to rule out Female Athlete Triad.
Tenders are invited for Supply of Dexa Scan (Bone Densitometry system)