title: A 100-element ultrasonic circular array for endoscopic application in medicine and NDT.
abstract: In this paper we focus on a new developed ultrasonic circular array for endoscopic application in medicine and NDT. The new device consists of 100 strip elements. The diameter of this array is just 10 mm. The arrays are conceived for frequencies between 3.5 and 7.5 MHz, the band width has an amount of 50%. The mathematical algorithm, monochromatic and broadband simulations of the soundfield are shown and problems with grating lobes are discussed. Furthermore the process of manufacturing is discussed and partially depicted. We present the final results and ultrasonic images obtained from tissue aquivalent phantoms representing medical application and from special test specimens representing NDT- Application.
authors.affiliation: Department of Biomedical Engineering, Fraunhofer-Institute for NDT, Ingbert, W-Germany.
authors.forename: H P
authors.initials: HP
authors.lastname: Schwarz
authors.forename: H J
authors.initials: HJ
authors.lastname: Welsch
authors.forename: P
authors.initials: P
authors.lastname: Becker
authors.forename: R M
authors.initials: RM
authors.lastname: Schmitt
mesh_terms: D000465:Algorithms; D019723:Endoscopes; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D008953:Models, Anatomic; D014463:Ultrasonography / Q000295:instrumentation*