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Ultrasonic imaging system

  • US 4,237,737 A
  • Filed: 09/12/1978
  • Issued: 12/09/1980
  • Est. Priority Date: 09/14/1977
  • Status: Expired due to Term
First Claim
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1. An ultrasonic imaging system for forming an orthographic image and a tomographic image of an object comprising:

  • (a) a receiving transducer array having a plurality of elements positioned at the lattice points of a parallelogram,(b) a transmitting transducer array having a plurality of elements arranged on a straight line parallel to one side of said parallelogram at a period equivalent of the length of said side,(c) means for applying an electrical signal, having a delay time defined for each element, to said transmitting transducer array to project an acoustic pulse to an object,(d) said receiving transducer array receiving the reflected sound waves from said object,(e) a receiving beam former for compensating for the delay time of the received signals of each element in the receiving transducer array and adding the compensated signals of all the elements, said receiving beam former comprising of a quadrature demodulator which decomposes the output of a receiving transducer element into the inphase component and the quadrature component of a transmitting carrier signal, means for delaying said components, means for performing the complex multiplication for the delayed components, means for adding the real parts of the output of the complex multiplication means of all the channels, means for adding the imaginary parts of the output of the complex multiplication means of all the channels, a pair of square circuits for providing the square of the real sum and the imaginary sum respectively, and an adder for adding the output of said square circuits,(f) means for extracting the received beams in accordance with the timing of the transmitted beam, and(g) means for displaying the extracted received beams thereby forming an image.

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