Ultrasound scattering from spherical tumours

The interaction of biomedical ultrasound with spherical tumours in the human body is investigated using analytic methods which predict the angular distribution of the ultrasound scattered by the tumour. Both the tumour and the surrounding tissue are considered to be lossy elastic media, which support shear-wave modes in addition to the familiar compressional-wave acoustic modes. Exact expressions for the angular distribution of the ultrasonic energy scattered by the tumour are used to illustrate graphically the behaviour of plane ultrasound wave interactions.