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What (who) is A-scan - definition
A-scan ultrasound biometry
DIAGNOSTIC TEST USED IN OPTOMETRY OR OPHTHALMOLOGY
A-scan; A-scan ultrasonography
A-scan ultrasound biometry, commonly referred to as an A-scan (short for Amplitude scan), is a routine type of diagnostic test used in optometry or ophthalmology. The A-scan provides data on the length of the eye, which is a major determinant in common sight disorders.
Graham scan
ALGORITHM FOR FINDING THE CONVEX HULL OF A SET OF POINTS IN THE PLANE
Graham Scan; Graham's scan; Graham's algorithm
Graham's scan is a method of finding the convex hull of a finite set of points in the plane with time complexity O(n log n). It is named after Ronald Graham, who published the original algorithm in 1972.
Track while scan
RADAR MODE
Track-while-scan; Track While Scan; Track-While-Scan; Track-while-scan mode; Track while Scan; Search and track
The track while scan (TWS) is a mode of radar operation in which the radar allocates part of its power to tracking the target or targets while part of its power is allocated to scanning, unlike the straight tracking mode, when the radar directs all its power to tracking the acquired targets. In the TWS mode the radar has a possibility to acquire additional targets as well as providing an overall view of the airspace and helping maintain better situational awareness.
Examples of use of A-scan
1. A scan showed that his tumours had started to grow.
2. Finally a scan this year revealed the "tumour" had disappeared.
3. "I‘ll have a scan tomorrow and we‘ll see," said Henman.
4. "What‘s really astonishing is that Lisa had a scan at seven weeks because she‘d had problems and had been told it would be difficult to get pregnant, she ended up having a scan even earlier than we‘d normally do.
5. I had to go for a scan to check the shock hadn‘t harmed the baby.