Method and apparatus for ultrasound imaging using normalized difference
between successive frames
    2.
    发明授权
    Method and apparatus for ultrasound imaging using normalized difference between successive frames 失效
    使用连续帧之间的归一化差异的超声成像的方法和装置

    公开(公告)号:US5865752A

    公开(公告)日:1999-02-02

    申请号:US858205

    申请日:1997-05-07

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

    摘要: A method and an apparatus for frame averaging ultrasound imaging data. A one-tap IIR filter is used to average the corresponding pixel data of two frames. The frame averaging is a function of a normalized difference between the pixel data of the two frames. This is achieved by taking the absolute difference between the signal levels of the current frame and the previous frame and dividing the result by the arithmetic (or geometric) mean of the two data. A multitude of look-up tables of output values are generated off-line. Each look-up table is designed to be used under a specific set of operating parameters. In response to the user's selection of these operating parameters, the system downloads a selected frame-averaging look-up table from system memory. During subsequent system operation, the downloaded look-up table outputs values which are a function of the normalized difference between the previous and current frame data used to address the look-up table.

    摘要翻译: 一种用于平均超声成像数据的方法和装置。 单抽头IIR滤波器用于对两帧的相应像素数据进行平均。 帧平均是两帧的像素数据之间的归一化差异的函数。 这是通过取当前帧和前一帧的信号电平之间的绝对差并将结果除以两个数据的算术(或几何)平均值来实现的。 输出值的大量查询表离线生成。 每个查找表都被设计为在一组特定的操作参数下使用。 响应于用户对这些操作参数的选择,系统从系统存储器下载所选择的帧平均查找表。 在随后的系统操作期间,下载的查找表输出作为用于寻址查找表的前一帧和当前帧数据之间的归一化差的函数的值。

    Method and apparatus for polynomial approximation of nonlinear
operations in medical ultrasound imaging
    3.
    发明授权
    Method and apparatus for polynomial approximation of nonlinear operations in medical ultrasound imaging 失效
    医学超声成像中非线性运算多项式逼近的方法和装置

    公开(公告)号:US6045504A

    公开(公告)日:2000-04-04

    申请号:US094338

    申请日:1998-06-09

    IPC分类号: G01S7/52 A61B8/00

    CPC分类号: G01S7/52034 G01S7/52026

    摘要: Methods and apparatus for reducing the amount of computation required by nonlinear operations in medical ultrasound imaging by using lower-order polynomials to approximate the nonlinear functions. The method can be applied to envelope detection, phase detection, logarithmic compression and other nonlinear functions. Various pre-processing techniques (e.g., pre-reducing the data range and pre-dividing an entire range of the input into a number of subranges) can optionally be used prior to the polynomial approximation to achieve better accuracy, further reduce the polynomial order, and/or simplify the implementation.

    摘要翻译: 通过使用低阶多项式来近似非线性函数来减少医学超声成像中的非线性操作所需的计算量的方法和装置。 该方法可应用于包络检测,相位检测,对数压缩等非线性函数。 可以在多项式逼近之前可以使用各种预处理技术(例如,预先减少数据范围并将输入的整个范围预分为多个子范围),以实现更好的精度,进一步降低多项式阶数, 和/或简化实现。