[Systems theory of ultrasound pulse echo technic (1)].

The properties of diagnostic pulse echo systems, independent of instrument characteristics (ideal system) are analysed in Part 1 and it is shown in Part 2 how they are modified by "typical" instrument parameters. A simplified block diagram of an ideal system is analysed in the time and frequency domain by means of the one-dimensional system theory. The terms dynamic range, maximum penetration depth and amplitude resolution are explained.