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Method and apparatus for coherent imaging system

  • US 5,005,419 A
  • Filed: 06/16/1988
  • Issued: 04/09/1991
  • Est. Priority Date: 06/16/1988
  • Status: Expired due to Fees
First Claim
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1. A medical imaging system for generating a stream of digital data signals with a vibrating energy beam having increased dynamic range which represents at least one object point detected in the object region including:

  • (a) an array of transducer elements which produces bipolar analog echo signals from impingement with at least one object point in the object region,(b) means to process the analog echo signals with at least one analog-to-digital converter device so that a stream of digital data signals is obtained from the analog-to-digital converter device bearing a mathematical relationship to the analog echo signals which approximates a non-linear amplitude compression function,(c) means to non-linearly process the stream of compressed amplitude digital data signals from the analog-to-digital converter device in accordance with the inverse of the previously employed mathematical function and thereby gain expanded amplitude digital data signals which are linearly related to the analog echo signals,(d) means for delaying the stream of digital data signals after amplitude compression by respective predetermined time intervals corresponding to the distance of the detected object point from the respective transducer elements which causes each data signal to occur at substantially the same time, and(e) means to obtain a summation of the delayed expanded amplitude digital data signals.

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