Accession Number : ADA331601

Title :   Beamformed Nearfield Imaging of a Simulated Coronary Artery Containing a Stenosis.

Descriptive Note : Final rept.,

Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI

Personal Author(s) : Hull, Andrew J. ; Owsley, Norman L.

PDF Url : ADA331601

Report Date : 06 OCT 1997

Pagination or Media Count : 42

Abstract : This report describes a method that detects and localizes an artery containing a partial 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 the three- dimensional solid. An experiment and numerical simulations are included to demonstrate this new approach to diagnosing arterial disease.

Descriptors :   *BEAM FORMING, *ELASTIC WAVES, *CORONARY ARTERIES, *STENOSIS, SHEAR PROPERTIES, ALGORITHMS, SIMULATION, EMISSION, SIZES(DIMENSIONS), WATER, ENERGY, NUMERICAL ANALYSIS, ARRAYS, DISEASES, TURBULENCE, INTERNAL, IMAGES, LOW FREQUENCY, NEAR FIELD, ARTERIES, URETHANES, MOLDS(FORMS), CONSTRICTIONS.

Subject Categories : Anatomy and Physiology
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE