Measuring and testing – Vibration – By mechanical waves
Patent
1979-03-29
1981-07-07
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
367105, G01N 2900
Patent
active
042767792
ABSTRACT:
An array of sonic transducers, useful for medical ultrasonic imaging, has individual sections thereof separately coupled for forming separate beams of sonic energy which converge, respectively, to separate foci along a common axis of the beams. The ratio of the diameter of the radiating aperture of the array relative to a wavelength of the sonic energy is chosen to provide a moderate degree of focusing so that the depth of field at one focus blends with the depth of field of the next focus. Thereby, there is formed a continuous region of substantially uniform intensity of sonic radiation along the common beam axis. Circuitry is provided for selecting one or more specific foci dependent on the bounds of a selected region to be insonified. Upon reception of sonic energy, circuitry is provided for selecting one or more specific foci as a function of the time of travel of an echo from a subject being observed to approximate a continuously varying focus in accordance with distance from successive points of reflection within the subject.
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M. Ueda et al., "Prototype of Dynamic Focusing Transducer," Bulletin of Tokyo Institute of Tech., No. 131, pp. 37-43, 1975.
Kreitman Stephen A.
Pannone Joseph D.
Raytheon Company
Santa Martin M.
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