Preparation and characterization of Poly(Vinyl-Alcohol) phantoms mimicking fibrous tissue

Microstructured PVA phantoms mimicking fibrous tissue have been made using a simple freeze casting process. SEM images reveal highly anisotropic microstructure with dimensions of the order of 5–20 um. Characterization of a sample from 20–50 MHz reveals a constant velocity of 1560 ms −1 and an attenuation coefficient slope of approximately 0.25 dB/(mm-MHz).