Method and apparatus for ringdown removal

Details Method and apparatus for ringdown removal Method and apparatus for ringdown removal

A - Human Necessities

61

B

A61B 8/00 (2006.01) A61B 8/12 (2006.01) G01S 7/52 (2006.01) G01S 15/89 (2006.01)

Patent

CA 2308457

An ultrasonic imaging method, and apparatus in which a reference waveform that is substantially free of echoes are modified to be equal to a weighted sum of the reference waveform, the filtered signals from the transducing elements (64) which transmit the ultrasonic waves, and receive the reflected echoes. The modified waveform is then subtracted from the transducer signals to remove ringdown signals, and provide a displayed image which is substantia lly free of ringdown artifacts (84).

L'invention porte sur un procédé d'imagerie ultrasonique et sur un appareil dans lequel une forme d'onde de référence pratiquement exempte d'échos est modifiée de façon à être égale à une somme pondérée de la forme d'onde de référence, les signaux filtrés provenant des éléments (64) de transduction qui émettent des ondes ultrasoniques et reçoivent des échos en retour. La forme d'onde modifiée est ensuite soustraite des signaux du transducteur de façon à éliminer les signaux de type "ringdown" et obtenir l'affichage d'une image qui est pratiquement exempte d'artéfacts de type "ringdown".

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