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 ?
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.
Pulmonologists ordered DEXA scans for almost half of their glucocorticoid patients; primary care physicians ordered such a scan for 26% of patients.
Synexus has recently carried out tens of thousands of heel tests and followed up with thousands of DEXA scans to recruit patients onto osteoporosis studies.
Another problem is that DEXA scans are limited by their inability to discriminate between cortical and trabecular BMDs.
DEXA scans require the patient to lie down while the x-ray device passes over the spine, pelvic and hip area to assess bone strength and health.
Q: I have read that strontium helps the Dexa scans improve, but not help bones get stronger.
IBD patients with an abnormal bone density exam had a significantly higher rate of Vitamin D deficiency than those who had normal DEXA scans," said Bincy P.
The ORAT was validated in 1,070 postmenopausal women over 45 years old who underwent DEXA scans at 12 centers in Florida.
The DEXA scans revealed significant improvements in lean body mass and mineral content in patients who received teduglutide compared to those who received placebo.
NWHN believes that research on both osteoporosis and on DEXA scans should take these differences into account; until then, women of color should approach screening with caution.
AMI specializes in MRI, CT, PET/CT imaging, Digital Mammography, Ultrasound, DEXA scans, Fine Needle Aspirations, Core Biopsies, as well as Nuclear Imaging, and X-rays.