title: [Bow artefact in B-image sonography].
abstract: Bow-shaped artifacts can often be seen in B-mode-ultrasound examinations. In order to find out the origin of these artifacts, water tank experiments were carried out and compared with in vivo observations. The studies showed that bow-shaped artifacts are caused by beam breadth, and that their shape is influenced by the type of the B-mode-instrument, the adjustment of the machine, and by the shape of the reflector. In vitro and in vivo, bow-shaped artifacts arise at strong reflectors and are visible in regions of low echogeneity. In vivo bow-shaped artifacts may imitate pathological findings such as septa or sludge.
mesh_terms: D001201:Ascites / Q000175:diagnosis; D005705:Gallbladder Diseases / Q000175:diagnosis*; D006801:Humans; D008107:Liver Diseases / Q000175:diagnosis*; D008953:Models, Anatomic; D014463:Ultrasonography; D001745:Urinary Bladder Diseases / Q000175:diagnosis*
vernacular_title: Das Bogenartefakt in der B-Bild-Sonographie.