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A-scan ultrasonography - Übersetzung nach russisch
медицина
одномерная эхография
![Video is available]]}}](https://commons.wikimedia.org/wiki/Special:FilePath/B-flow ultrasonography of venous reflux.jpg?width=200 "Video is available]]}}")
![[[Ultrasound]] of [[carotid artery]]](https://commons.wikimedia.org/wiki/Special:FilePath/Carotid ultrasound.jpg?width=200 "[[Ultrasound]] of [[carotid artery]]")
![page=6}}<br>[https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License (CC-BY 4.0)]</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/Hip joint injection by anterior longitudinal approach.jpg?width=200 "page=6}}<br>[https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License (CC-BY 4.0)]</ref>")
![Panoramic ultrasonography of a proximal [[biceps tendon rupture]]. Top image shows the contralateral normal side, and lower image shows a retracted muscle, with a [[hematoma]] filling out the proximal space.](https://commons.wikimedia.org/wiki/Special:FilePath/Panoramic ultrasonography of biceps tendon rupture - Annotated.jpg?width=200 "Panoramic ultrasonography of a proximal [[biceps tendon rupture]]. Top image shows the contralateral normal side, and lower image shows a retracted muscle, with a [[hematoma]] filling out the proximal space.")
![BPH]]) visualized by medical sonographic technique](https://commons.wikimedia.org/wiki/Special:FilePath/UltrasoundBPH.jpg?width=200 "BPH]]) visualized by medical sonographic technique")
![Ultrasound of human [[heart]] showing the four chambers and mitral and [[tricuspid]] valves.](https://commons.wikimedia.org/wiki/Special:FilePath/Ultrasound of human heart apical 4-cahmber view.gif?width=200 "Ultrasound of human [[heart]] showing the four chambers and mitral and [[tricuspid]] valves.")
![Compression is used in this ultrasonograph to get closer to the [[abdominal aorta]], making the [[superior mesenteric vein]] and the [[inferior vena cava]] look rather flat.](https://commons.wikimedia.org/wiki/Special:FilePath/Ultrasonographic measurement of aortic diameter at the navel.svg?width=200 "Compression is used in this ultrasonograph to get closer to the [[abdominal aorta]], making the [[superior mesenteric vein]] and the [[inferior vena cava]] look rather flat.")
медицина
ультразвуковое исследование органов малого таза
эхография органов малого таза
медицина
эхокардиография в М-режиме
Definition
Wikipedia
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.
