Theory:   

This phantom is for 3-D reconstruction of US images.

Description:

An echo rich copy of a doll head is placed in an echo poor background.

Specifications:

Outer dimensions: 17 * 18,5 * 18,5 cm. Weight: 4,5 kg. The size of the Doll Head is about 138 ml, it can be specified with 1 decimal. Background mass: Sound speed 1500 m/sec +/-15 m/sec. Attenuation, backscattering and density: not specified.