Beamformed Nearfield Imaging of a Simulated Coronary Artery Containing a Stenosis

摘要

This report describes a method that detects and localizes an artery containing apartial blockage by exploiting the shear wave field properties of the surrounding solid. An array measurement system is placed on the free surface of a urethane mold that contains a surgical tube. Inside the surgical tube is a nylon blockage that acts as a constriction to the water flowing through the tube. A turbulent field develops in and downstream of the blockage, creating a randomly fluctuating pressure on the inner wall of the tube. This force produces shear and compressional wave energy in the urethane. At low frequencies, the array is used to measure the dominant shear wave energy, and nearfield (i.e., focused) beamforming algorithms are used to detect and localize these energy emissions in