Improvement of the resolution limit caused by the width of the sound beam

Determining of size and shape of reflector with ultrasound imaging is subjected to several limitations. Beside the wavelength, the sound beam width is a second known constraint. However, the resolution can also be restricted by the analysed reflector itself by its shape, alignment, surface roughness and material. Furthermore, different reflectors can be displayed identically with a simple c-scan, so that no differentiation is possible. In this work two different basic reflectors, balls and circular disks, were analysed. An easy method to distinguish between them will be introduced. In addition, several approaches for estimating the size of balls with ultrasound will be presented.