Zusammenfassung
Der Gebrauch des Ultraschall-B-Bild-Verfahrens in der Augenheilkunde hat sich in den letzten 30 Jahren sehr bewährt. Das generelle Prinzip der Bilderstellung mit Ultraschall basiert auf der Entwicklung des Unterwassersonars in der Schifffahrt. Ein sog. piezoelektrischer Kristall, d. h. ein durch elektrische Stimulation verformbarer Kristall im Schallkopf, generiert Ultraschallimpulse als Antwort auf kurze elektrische Stimulationen. Die Impulse breiten sich durch ein Ankoppelungsmedium mit der in der Umgebung geltenden Schallgeschwindigkeit aus und durchdringen die Gewebe des Auges. Sie haben — abhängig von der jeweiligen Gewebeart — unterschiedliche Ausbreitungsgeschwindigkeiten, wobei Luft die Schallwellen sehr schlecht und Wasser sehr gut leitet. Die Schallwellen werden an großen Grenzflächen reflektiert und gebeugt, an kleinen Grenzflächen gestreut. Der Anteil, der den Schallkopf wieder erreicht, wird zur Bildgebung verwendet.
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Roters, S., Krieglstein, G.K. (2001). Grundlagen. In: Atlas der Ultraschall-Biomikroskopie. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56907-4_1
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DOI: https://doi.org/10.1007/978-3-642-56907-4_1
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