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    Medical ultrasonic diagnostic imaging method and apparatus
    3.
    发明授权
    Medical ultrasonic diagnostic imaging method and apparatus 有权
    医用超声诊断成像方法及装置

    公开(公告)号：US06193659B1

    公开(公告)日：2001-02-27

    申请号：US09282397

    申请日：1999-03-31

    申请人： Bhaskar S. Ramamurthy ,  Charles Bradley ,  Ken Sawatari ,  Danhua Zhao ,  Stuart L. Carp ,  Stirling S. Dodd ,  David J. Hedberg ,  Samuel H. Maslak ,  Daniel E. Need

    发明人： Bhaskar S. Ramamurthy ,  Charles Bradley ,  Ken Sawatari ,  Danhua Zhao ,  Stuart L. Carp ,  Stirling S. Dodd ,  David J. Hedberg ,  Samuel H. Maslak ,  Daniel E. Need

    IPC分类号： A61B800

    CPC分类号： A61B8/481 ,  G01S7/5202 ,  G01S7/52038 ,  G01S15/8915 ,  G01S15/8927 ,  G01S15/895

    摘要： An improvement to the method for harmonic imaging including the steps of (a) transmitting ultrasonic energy at a fundamental frequency and (b) receiving reflected ultrasonic energy at a harmonic of the fundamental frequency is provided. The transmitting step includes the step of: applying the plurality of waveforms to a respective plurality of transducer elements, a first waveform of the plurality of waveforms characterized by a first value of a harmonic power ratio, waveforms transmitted from the transducer elements and corresponding to the plurality of waveforms summing as an acoustic waveform substantially at the point, the acoustic waveform characterized by a second value of the harmonic power ratio less than the first value. The imaging method can also include a step for subdividing the transmit aperture into two or more subapertures, each subaperture having at least four adjacent transducer elements. The subapertures are phased differently with respect to one another to selectively reduce either fundamental components or harmonic components of echoes from tissue. These techniques can be used to improve contrast agent harmonic imaging as well as tissue harmonic imaging, depending upon the phase shift selected.

    摘要翻译： 提供了一种对谐波成像方法的改进，包括以下步骤：（a）以基频传输超声波能量;（b）在基频谐波处接收反射的超声波能量。 发送步骤包括以下步骤：将多个波形应用于相应的多个换能器元件，所述多个波形的第一波形以谐波功率比的第一值为特征，从换能器元件发送的波形对应于 多个波形基本上在该点处作为声波形求和，声波特征在于小于第一值的谐波功率比的第二值。 成像方法还可以包括将发射孔分成两个或更多个子孔径的步骤，每个子孔径具有至少四个相邻的换能器元件。 子孔径相对于彼此不同地相位选择性地降低来自组织的回波的基本分量或谐波分量。 这些技术可以用于根据选择的相移来改善造影剂谐波成像以及组织谐波成像。

    Diagnostic medical ultrasonic system and method for image subtraction
    5.
    发明授权
    Diagnostic medical ultrasonic system and method for image subtraction 有权
    诊断医用超声波系统及图像减法方法

    公开(公告)号：US5971928A

    公开(公告)日：1999-10-26

    申请号：US184749

    申请日：1998-11-02

    申请人： Stirling S. Dodd ,  Brian M. Normand

    发明人： Stirling S. Dodd ,  Brian M. Normand

    IPC分类号： G01S7/52 ,  G01S15/89 ,  A61B8/00

    CPC分类号： G01S7/52041 ,  G01S15/8979 ,  G01S7/52026 ,  G01S7/52066

    摘要： A patient is first injected with a contrast agent. A complete scan along a plurality of scan lines is then performed, resulting in the destruction of some contrast agent. While some of the contrast agent is destroyed, non-scanned portions of the target, and possibly the scan region, still include at least some contrast agent. A second scan is then sequentially performed sufficiently close in time to the first scan such that reflections from the anatomy remain unchanged. The second frame of data from the second scan will differ from the first frame of data from the first scan by only contrast agent effects. The second frame of data is subtracted from the first frame of data. The resulting data is used to image the contrast agent. By varying the time between each pair of scans, differences in the speed of the contrast agent motion within the body may be assessed. The collateral damage of contrast agents from ultrasound acoustic energy is minimized while the degradation due to various changes is also minimized.

    摘要翻译： 患者首先注射造影剂。 然后执行沿着多条扫描线的完整扫描，导致一些造影剂的破坏。 虽然一些造影剂被破坏，目标的未扫描部分和可能的扫描区域仍然包括至少一些造影剂。 然后，第二次扫描在时间上顺序地执行到第一扫描，使得来自解剖结构的反射保持不变。 来自第二次扫描的第二帧数据将不同于仅通过对比剂效应从第一次扫描的第一帧数据。 从第一帧数据中减去第二帧数据。 所得数据用于对造影剂进行成像。 通过改变每对扫描之间的时间，可以评估体内造影剂运动速度的差异。 造影剂从超声声能的附带损伤最小化，同时由于各种变化引起的退化也被最小化。