Independent testing of soft tissue visco-elasticity using indentation and rotary shear deformations.

摘要: Numerous techniques exist to measure the mechanical properties of soft tissues in vivo, such as stretching, indentation or shearing, well elastographic methods employing ultrasound other imaging modes. Many groups have reported which do not necessarily correspond with each due differences choice technique, tissue model variations. This work deliberately makes use two independent modes and rotary shear, on same material samples, similar modeling approximations, attempt determine common, underlying properties. paper introduces ROSA-2 shear instrument, presents its characteristics, presenting validation experiments that were performed verify non-slip contact tissue. Measurements made it are compared those acquired TeMPeST l-D instrument. Initial testing showed reasonably agreement when silicone gel over a restricted range frequencies. When bovine liver samples vitro porcine significant discrepancies found. The potential sources these will be discussed, directions for ongoing work.