[Systems theory of ultrasound pulse echo technic (2)]

Part two explains the terms, spatial resolution, range ambiguity and maximum frame rate of diagnostic pulse echo systems. Then the idealised system described in part one is completed by incorporating various band pass filters, which represent the effects of resonant piezoelectric transducers and electric filters of the TGC amplifiers. The influence of such band limiting components on spatial resolution and dynamic range are shown by numerical examples. Mathematical derivations are restricted to the necessary minimum and all formulae are illustrated by means of a substantial number of graphs.