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    Ultrasonic detection of contrasting agents
    4.
    发明公开
    Ultrasonic detection of contrasting agents 失效
    造影剂的超声波探测

    公开(公告)号：EP0713680A3

    公开(公告)日：1998-08-12

    申请号：EP95308391

    申请日：1995-11-22

    Applicant: ADVANCED TECH LAB

    Inventor： JOHNSON KEITH W ,  POWERS JEFFRY E

    IPC: A61B8/00 ,  G01S7/52

    CPC classification number: A61B8/481 ,  G01S7/52041 ,  G01S7/52049

    Abstract: An ultrasonic diagnostic system is provided which detects the presence of coated microbubble contrast agents in the body of a patient by transmitting ultrasonic energy which causes the destruction of the coated microbubbles and detects the microbubble destruction through phase insensitive detection and differentiation of echoes received from two consecutive ultrasonic transmissions. The destruction of a microbubble can also be used as a point source of acoustic energy for aberration correction, whereby the timing of the beamformer is adjusted from an analysis of beamformer signals resulting from a detected microbubble destruction event.

    UNALIASED QUADRATURE AUDIO SYNTHESIZER
    5.
    发明专利
    UNALIASED QUADRATURE AUDIO SYNTHESIZER 未知

    公开(公告)号：CA1235789A

    公开(公告)日：1988-04-26

    申请号：CA478266

    申请日：1985-04-03

    Applicant: ADVANCED TECH LAB

    Inventor： POWERS JEFFRY E

    IPC: A61B8/00 ,  A61B8/06 ,  G01S15/58 ,  G01S15/89

    Abstract: UNALIASED QUADRATURE AUDIO SYNTHESIZER The apparatus described unaliases a Doppler signal which is related to the velocity of blood flowing in a sample volume. It then generates an audio output corresponding to the unaliased Doppler signal. The device generates an unaliased, instantaneous signal which corresponds to the Doppler frequency associated with the blood velocity in the sample volume. That unaliased instantaneous frequency is fed into programmable read only memories (PROMs) which provide digitized values for the sine and cosine functions. Those values are fed into digital-to-analog converters, and they are scaled to provide audio outputs.

    8.
    发明专利
    未知

    公开(公告)号：DE69127310D1

    公开(公告)日：1997-09-25

    申请号：DE69127310

    申请日：1991-04-17

    Applicant: ADVANCED TECH LAB

    Inventor： POWERS JEFFRY E

    IPC: A61B8/00 ,  A61B8/08 ,  A61B8/14 ,  A61B17/22 ,  A61B17/34

    Abstract: A system for imaging a biopsy needle with ultrasound is shown in which the needle tip elicits a Doppler response through controlled reciprocation of the needle tip. In a preferred embodiment the biopsy needle includes a hollow cannula (40) which carries a removable stylet. Means for reciprocating (44) the stylet is coupled to the proximal end of the stylet, and the distal tip of the stylet is reciprocated at the distal end of the cannula. This motion is detected through Doppler interrogation of the body region at which the biopsy is to be performed, and the Doppler response of the needle tip in the image of the body region allows the needle tip to be monitored as it approaches the tissue to be biopsied.

    9.
    发明专利
    未知

    公开(公告)号：DE69118645T2

    公开(公告)日：1996-11-28

    申请号：DE69118645

    申请日：1991-10-11

    Applicant: ADVANCED TECH LAB

    Inventor： PETERSON ROY BECK ,  POWERS JEFFRY E

    IPC: A61B8/06 ,  G01F1/66 ,  G01P5/00 ,  G01P5/24 ,  G01S15/52 ,  G01S15/58 ,  G01S15/89

    Abstract: An ultrasonic diagnostic system for measuring fluid flow velocities through Doppler techniques is provided which eliminates the effects of tissue motion from fluid flow velocity information. Doppler information signals are discriminated to determine the presence of signal components resulting from moving tissue, which signal components are located at frequencies of a Doppler spectrum other than the predetermined frequency location of stationary tissue signals. The tissue motion signal components present are shifted to the predetermined frequency location and removed by high pass filtering the Doppler signals. The remaining signals are then shifted back to their original frequency location and transmitted to a Doppler velocity estimator for further processing of the fluid flow velocity information and ultimate display of the information. To overcome problems of Doppler frequency inaccuracies at discrete spatial positions, the Doppler signals from a plurality of neighbouring spatial locations are examined in the aggregate to determine the frequency location of tissue motion signal components.

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