G - Physics – 01 – N
Patent
G - Physics
01
N
349/25, 349/36,
G01N 29/00 (2006.01) A61B 10/00 (2006.01) G01S 15/89 (2006.01) G10K 11/34 (2006.01)
Patent
CA 1114491
ABSTRACT An ultrasonic imaging system is provided for forming an orthographic and a tomographic image of an object. The system comprises a receiving transducer array having a plura- lity of elements positioned at the lattice points of a paral- lelogram and a receiving transducer array having a plurality of elements arranged in a straight line parallel to one side of the parallelogram at a period equivalent to the length of the side. Means are provided for applying an electrical sig- nal having a delay time defined for each element to the trans- mitting transducer array to project an acoustic pulse to an object and the receiving transducer array receives the reflec- ted sound waves from the object. A receiving beam former compensates for the delay time of the received signal for each element in the receiving transducer array and adds the compen- sated signals for all the elements. The receiving beam former comprises 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. The beam former also includes means for delaying the components, means for performing the complex multiplication of the delayed components, means for adding the real parts of the output of the complex multiplication means for all channels, means for adding the imaginary parts of the output of the complex multi- plication means for all 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 outputs of the square circuits. Further, means are provided for extracting the received beams in accordance with the timing of the trans- mitted beam and are provided for displaying the extracted received beams thereby forming an image.
310798
Oki Electric Industry Co. Ltd.
Ridout & Maybee Llp
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