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Frequency varied ultrasonic imaging array

  • US 4,442,713 A
  • Filed: 03/09/1982
  • Issued: 04/17/1984
  • Est. Priority Date: 03/09/1982
  • Status: Expired due to Term
First Claim
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1. An ultrasonic imaging apparatus, which comprises an array of transducer elements for transmitting ultrasonic signals having a first predetermined center frequency into an object to be examined through use of the transmitted signals reflected from within the object and sensed by the apparatus, the reflected signals sensed by the apparatus having a second center frequency less than the first center frequency as a result of signal attenuation by the object, and means connected to select a number of transducers in said array for transmitting the ultrasonic signals inversely proportional to the second center frequency.

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