Abstract
Phantoms for ultrasonography have been widely used to improve skills of physicians and techniques of ultrasonic scattering. Several kinds of phantoms for ultrasonography have already been developed using gelatin, Polyacrylamide. In the development of biomodel for ultrasonography that covers human soft tissue, to change the mechanical properties widely is useful. We chose a poly (vinyl alcohol) hydrogel (PVA-H) to mimic human soft tissue. The purpose of this study is to measure the mechanical properties with varieties of concentration of solvent of PVA solution. The ratio of the mixed solution of Dimethyl sulfoxide (DMSO) and water was changed. The measurement of the static viscoelasticity, the dynamic viscoelasticity, and the loss tangent of PVA-H were performed. In addition, we measured the transverse wave velocity for the phantom to which graphite was added. In conclusion, the variety of mechanical properties of PVA-H is shown by the change of solvents, and especially the loss tangent is twice higher than the conventional PVA-H. And the transverse wave velocity has also a relation to the solvents.
