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ULTRASONIC REFLECTOR IMAGING SYSTEMS
MAGNETOSTRICTIVE IMAGING SYSTEMS
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aberrations acoustic beam acoustic lens acoustic velocity amplitude aspheric Aspheric lens attenuation axis B-scan beam profiles beam widths calculated central ray Chapter depth of focus derivative DIFFERENT BEAM DIRECTIONS diffraction distance ellipse envelope detector experimental field of view focal length focal plane focii focused Fraunhofer approximation frequency geometrical image geometry image plane image points impulse response inhomogeneous integral interfaces lateral resolution lens aperture lens surface lens system lenses longitudinal beam contours lucite magnetic field magnetostrictive imaging system magnetostrictive particles matching layer multiple echoes nickel off-axis parameters path length PEAK phased array produce profiles in Fig pulse radiation pattern ray trace rays are traced received echoes reflection coefficient reflector function reflector systems reverberations sector angle shown in Fig SIMULATED ONE-WAY BEAM skin spatial spherical Table three-dimensional tion tissues transducer transducer elements TRANSDUCER POSITION transversal filter ultrasonic imaging systems ultrasonic wave ultrasound variable wave equations