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 ?
Taking DEXA scan report as gold standard sixty people who had either Osteopenia or Osteoporosis forms the case group and remaining 50 people who had DEXA report normal formed the control group.
DEXA Scan was repeated from AFIRM after one year of treatment and T Score was measured again.
Routine hip and spine, as well as an additional whole-body scan, were examined during the DEXA scan. Calculation by DEXA scan using the 3-compartment (3C) model is a gold standard in body composition measurements.
Out of the 40 subjects who completed a DEXA scan, 17 (42.5%) were osteopenic (>-2.5 T-score < -1.0) and three (7.5%) were osteoporotic (T score <= -2.5) (Table 3).
Based on these findings, bone mineral density could serve as such a marker, and DEXA scans could be a good prediction tool, he said.
Participants had baseline DEXA scans, which were repeated at years 2, 6, 8, 10, and 16.
Monitoring bone mineral density (DEXA scan) among MSM using PrEP HIV acquisition risk Osteopaenia risk Resources Intervention High High High PrEP + DEXA scan (baseline and 12- monthly) Moderate High High PrEP + DEXA scan (baseline and 12- monthly) High High Low PrEP + advise and observe Moderate Low Low PrEP + advise and observe High Low High PrEP + DEXA scan (baseline, repeat if indicated) High Low Low PrEP + observe
While 53% of study participants were taking a PI at the time of their DEXA scan, 53% were taking Viread.
Going through the public sector for a DEXA scan, patients have to wait three to four months, according to the same data.
A subset of 75 randomized subjects also had a DEXA scan to measure body fat, and 73 randomized subjects had a multislice abdominal CT scan to measure visceral fat.
Of the total of 73 patients, 54 patients underwent a DEXA scan at diagnosis and the Osteoporosis (WHO defined criteria of T score below 2.5 SD the mean adult) was detected in 15(27.3%) of them.
Subject-specific inertial parameters (segment mass, segment center of mass location, and moment of inertia) were determined from a whole body DEXA scan (Hologic QDR-1500).