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Frequency controlled hybrid ultrasonic imaging arrays

  • US 4,446,740 A
  • Filed: 03/09/1982
  • Issued: 05/08/1984
  • Est. Priority Date: 03/09/1982
  • Status: Expired due to Fees
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, means connected to transmit the ultrasonic signals from said array in a stepped array mode, means connected to transmit the ultrasonic signals from said array in an angle scanning mode, means for transmitting the signals to a desired depth within the object, the detected echoes from a particular depth sensed by the apparatus having a corresponding second center frequency less than the first center frequency as a result of signal attenuation by the object, and means connected to select automatically between said stepped array transmitting means and said angle scanning transmitting means so that at least some of the transducer elements are selectively used to transmit in both the stepped array mode and the angle scanning mode for operating said array elements based on the detected second center frequency.

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