Abstract: In an exemplary embodiment, an ultrasonic scanning apparatus has an articulated support for at least one scan head and angle indicators for determining point- and/or direction-coordinates of the scanning. An angle detection and processing is desired which is considerably simplified as compared with the state of the art but which is nevertheless highly precise, interference-insensitive and cost-economical.

Abstract: In a focusing ultrasonic transducer with a recessed active surface, it is desirable that, given values of the focal width and of the focal distance prescribable as desired, an optimum lateral resolution with the smallest possible influence of side lobes ensues. This is achieved by means of manufacture in the following steps:(a) first, for focal width (F.sub.B) or focal interval (F.sub.A), the outer dimension (2a.sub.O) is determined as a function of the radius of curvature (R) of the transducer or the radius of curvature (R) is determined as a function of the outer dimension (2a.sub.O);(b) then the magnitude of outer dimension or, respectively, radius of curvature not yet determined is determined for the other of the two focal magnitudes (for example, F.sub.A); and(c) the maximum value of the angle of aperture of the sound radiation field behind the focus deriving in that manner is limited by means of a suitable selection of the size (2a.sub.