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Qu'est-ce (qui) est A scan - définition

DIAGNOSTIC TEST USED IN OPTOMETRY OR OPHTHALMOLOGY

A-scan; A-scan ultrasonography

A-scan ultrasound biometry

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.

https://en.wikipedia.org/wiki/A-scan_ultrasound_biometry

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.

https://en.wikipedia.org/wiki/Graham_scan

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.

https://en.wikipedia.org/wiki/Track_while_scan

Wikipédia

A-scan ultrasound biometry

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. The most common use of the A-scan is to determine eye length for calculation of intraocular lens power. Briefly, the total refractive power of the emmetropic eye is approximately 60. Of this power, the cornea provides roughly 40 diopters, and the crystalline lens 20 diopters. When a cataract is removed, the lens is replaced by an artificial lens implant. By measuring both the length of the eye (A-scan) and the power of the cornea (keratometry), a simple formula can be used to calculate the power of the intraocular lens needed. There are several different formulas that can be used depending on the actual characteristics of the eye.

The other major use of the A-scan is to determine the size and ultrasound characteristics of masses in the eye, in order to determine the type of mass. This is often termed quantitative A-scan.

Instruments used in this type of test require direct contact with the cornea, however a non-contact instrument has been reported. Disposable covers, which come in actual contact with the eye, have also been evaluated.

https://en.wikipedia.org/wiki/A-scan ultrasound biometry

Exemples du corpus de texte pour 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.