A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/36
A61B 10/00 (2006.01) G01N 29/00 (2006.01) G01S 7/52 (2006.01) G01S 15/89 (2006.01)
Patent
CA 1129539
PATENT APPLICATION of WESTON ANDERSON for ULTRASONIC IMAGING SYSTEM UTILIZING DYNAMIC AND PSEUDO DYNAMIC FOCUSING ABSTRACT OF DISCLOSURE A phased array ultrasonic imaging system is disclosed which combines aspects of both dynamic and pseudo-dynamic focusing. The system includes a linearly arranged array of side-by-side transducers adapted for propagating ultra- sonic energy into a body co be ultrasonically examined and for receiving reradiated sonic energy from points within the body. A signal channel is connected to each of the transducers for activating same to propagate the sonic energy and for receiving electrical signals from the transducers (which correspond to the reradiated energy). Controllable delay means are provided in each of the channels for introducing linear phase shifts in the electrical signals proceeding in the channels during both transmission and reception to thereby azimuthally steer the transducer array. Means are further provided for processing the received signals proceeding through the channels and for combining same to effect a visual display of the bodily portion being examined. Means synchronized with the activating of the transmitters periodically reduce the gain of one or more symmetric outer transducer pairs of the array, thereby effecting reducing the aperture of the array to enable improved response to reflected acoustic information reaching 2nerSJK012979 the array from the near field thereof. The outer elements are similarly restored to enlarge the effective array aper- ture for improved response to reflected acoustic information arising from the far field of the array. Pursuant to the improvement of the invention, means are provided for ad- justing the focal length of the array coincident with the aforementioned change in chain of the one or more outer transducer pairs, i.e., coincident with a change in effec- tive aperture of the array in order to thereby maintain or achieve a desired resolution within a specified focal range. 2nerSJK012979 - 2 - 19-07
344992
R. William Wray & Associates
Varian Associates Inc.
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