In most ultrasonic diagnostic methods so far suggested, the output is in the form of a two‐dimensional image, and a serial set of cross sections is used to give three‐dimensional information about the part examined. The paper demonstrates the practicability of forming a section at any arbitrary angle through the three‐dimensional information using a digital computer. In addition, information from two mutually perpendicular sets of planes can be consolidated into a single series of echograms, thus overcoming to some extent the loss of information due to specular reflection. While this technique does not appear to be practical for routine diagnosis with the present generation of pulse‐echo machines, it would be simply incorporated in a computer‐based device using acoustical holography, Bragg imagery, or a transducer array technique for data acquisition.