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Beat frequency ultrasonic microsphere contrast agent detection system

  • US 5,601,086 A
  • Filed: 05/12/1995
  • Issued: 02/11/1997
  • Est. Priority Date: 05/12/1995
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting the presence of ultrasonically relative microsphere contrast agents in a fluid, comprising:

  • means for directing ultrasonic energy into a region of the fluid at a first discrete frequency, the first frequency being approximately at a resonant frequency of the microspheres in the range of 1 MHz-30 MHz;

    means for simultaneously directing ultrasonic energy into the region of fluid at a second discrete frequency that is also an approximate resonant frequency of the microspheres, wherein the microspheres in the fluid interact to emit sum and difference frequencies; and

    means for detecting the sum and difference frequencies.

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