Abstract: The apparatus for ultrasonic tissue investigation comprises an ultrasonic transducer (1) adapted to emit pulsed emissions into tissue and means (2) to move the transducer to scan an area of tissue to be investigated. Signals reflected from interfaces between acoustically different tissue components are received and converted into a representation of the tissue, which may be visually displayed. The emissions of ultrasonic radiation are so pulsed that each pulse has a very rapid fall back period, enabling better discrimination. Interpretation of the images may be facilitated by use of such techniques as fractal analysis.