Fine Granule Evaluation Model from Coarse Granule in Medical Ultrasonic System

In this paper, we describe medical ultrasonic systems, which evaluate a fine granule from a coarse granule. In ultrasonic systems, a measurement limitation is known as an object larger than the half-wavelength. However, we need to measure the object beyond the limitation. First, we describe an ultrasonic system for identifying a surface roughness. A fine granule evaluation model is made form the experiment. An ultrasonic system developed from the model can evaluate the roughness of a human imitated phantom with 89% accuracy. Second, we describe an ultrasonic system for identifying kinetic viscosity of liquid. The fine granule evaluation model is derived from a wave equation theoretically. The experimental results show that the developed system from the model can evaluate the viscosity.