Development of Scanning Method for Puncture Needle-Type Ultrasonography

Abstract

In this paper, we propose a scanning method for determining the acoustic impedance difference for puncture needle-type ultrasonography using a thin rod. The principle of the proposed scanning method is based on the movements of the end point of a lever. A thin rod is placed on the fulcrum, there by forming a lever. When the end point of the thin rod rotates clockwise forming a circle, the other side of the thin rod moves counterclockwise also forming a circle. By sensing the surface of the sample as a function of the angle made by the thin rod and center axis, scanning can be performed. First, we confirmed that the scanning is possible using the lever; moreover, the movement of the end of the rod is related to that of the other end of the lever. Next, we also confirmed that a one-dimensional image of the amplitude of an interference signal shows the difference in impedance between the polyethylene (PE), acrylic (AC), and polypropylene (PP). The experimental results show that the method is useful for scanning.