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EP0144968A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Ultrasonic diagnostic apparatus

Assignee: Hitachi Ltd
•
Filing: 1984-12-04
•
Granted: —
•
Expires: 2004-12-04
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Abstract

Abstract @ An ultrasonic diagnostic device capable of the accurate real-time measurement and display of the amount of deviation in the velocity distribution of moving objects within a living organism. This apparatus represents an improvement on the ultrasonic diagnostic apparatus of the type wherein an ultrasonic pulse beam is repeatedly transmitted into a living organism at a fixed pulse rate and the reflected echoes are picked up, amplified and displayed, the improvement comprising a complex signal converter for converting a received high frequency signal into complex signals by mixing the received high frequency signal with a pair of complex reference signals which have frequencies that are integer multiples of the pulse rate and which are complexly related to one another, an autocorrelator for determining the autocorrelation of the complex signals, the autocorrelator having a delay time equal to an integer multiple of the pulse period, and a deviation determinator for determining the amount of deviation from the autocorrelation.

Inventors

  • 👤 Kouroku C/O Aloka Co. Ltd Namekawa
  • 👤 Akira C/O Aloka Co. Ltd Koyano
  • 👤 Chihiro C/O Aloka Co. Ltd Kasai

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 04:36
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/06; G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/8979

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 159 words
An improved ultrasonic diagnostic apparatus of the type wherein an ultrasonic pulse beam is repeatedly transmitted into a living organism at a fixed pulse rate and the reflected echoes are picked up, amplified and displayed as the velocity of movement within the organism, the improvement comprising a complex signal converter (36) for converting a received high frequency signal into a complex signal by mixing the received high frequency signal with a pair of complex reference signals (102, 104) which have frequencies that are integer multiples of the pulse rate (100) and which are complexly related to one another, an autocorrelator (50) for determining the autocorrelation of said complex signal, said autocorrelator having a time delay equal to an integer multiple of the period of the pulse rate, and a deviation determinator (80) for determining the amount of deviation of said autocorrelation, whereby the deviation distribution of the velocity of moving objects in the living organism is mesured and displayed.
Claim 2
Dependent Claim 159 words
An improved ultrasonic diagnostic apparatus of the type wherein an ultrasonic pulse beam is repeatedly transmitted into a living organism at a fixed pulse rate and the reflected echoes are picked up, amplified and displayed as the velocity of movement within the organism, the improvement comprising a complex signal converter (36) for converting a received high frequency signal into a complex signal by mixing the received high frequency signal with a pair of complex reference signals (102, 104) which have frequencies that are integer multiples of the pulse rate (100) and which are complexly related to one another, an autocorrelator (50) for determining the autocorrelation of said complex signal, said autocorrelator having a time delay equal to an integer multiple of the period of the pulse rate, and a deviation determinator (80) for determining the amount of deviation of said autocorrelation, whereby the deviation distribution of the velocity of moving objects in the living organism is mesured and displayed.
Claim 3
Dependent Claim 29 words
An ultrasonic diagnostic apparatus according to claim 1 further provided with a deviation determinator (80) for determining the amount of change in the absolute value of the complex autocorrelation.
Claim 4
Dependent Claim 31 words
An ultrasonic diagnostic apparatus according to claim 1 or 2 further provided with a deviation determinator (80) for determining the rate of decrease of the absolute value of the complex autocorrelation.
Claim 5
Dependent Claim 38 words
An ultrasonic diagnostic apparatus according to one of the claims 1 to 3 further provided with a complex delay-line canceller (44) for eliminating the signal components corresponding to slow moving members of the organism from the complex signal.

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