The Model 514 Multipurpose Phantom is composed of a hydrogel-based material which acoustically mimics human tissue. The phantom is contained in an acrylic housing to provide strength and permanence. A soft polyurethane film with an impedance closely matching that of human skin is used for the scan window, thereby allowing easy transmission of the ultrasound beam into the phantom. A built-in scanning well is provided to allow the use of water as the coupling medium. However, coupling gels may be used if desired.