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    Scan converter system
    1.
    发明授权
    Scan converter system 失效
    扫描转换器系统

    公开(公告)号：US4471449A

    公开(公告)日：1984-09-11

    申请号：US317081

    申请日：1981-11-02

    申请人： Steven C. Leavitt ,  Hugh G. Larsen ,  Barry F. Hunt

    发明人： Steven C. Leavitt ,  Hugh G. Larsen ,  Barry F. Hunt

    IPC分类号： G01S7/52 ,  G01S7/531 ,  G06T11/00 ,  G06F15/20 ,  H04N5/02

    CPC分类号： G01S7/52044 ,  G06T11/203

    摘要： Apparatus for interpolating data along radial lines so that it can be displayed at display points arranged in orthogonal rows and columns by recursively adding stored values to derive signals indicative of the radial position of each display point along the radial data lines and its angular position between the radial data lines. Interpolation is done along each radial line to derive first and second intermediate interpolated values, and these values are interpolated so as to derive the final data value for the display point at its angular position. Alternatively, the intermediate interpolated values can be attained by angular interpolation and the final data value by radial interpolation.

    摘要翻译： 用于沿着径向线插入数据的装置，使得其可以在以正交行和列排列的显示点处被显示，通过递归地添加存储的值以导出指示每个显示点沿着径向数据线的径向位置的信号，以及它们之间的角位置 径向数据线。 沿着每个径向线进行插值以导出第一和第二中间插值，并且对这些值进行内插，以便在其角位置导出显示点的最终数据值。 或者，可以通过角插值和通过径向内插的最终数据值来获得中间内插值。

    Scan converter system
    2.
    发明授权
    Scan converter system 失效
    扫描转换器系统

    公开(公告)号：US4468747A

    公开(公告)日：1984-08-28

    申请号：US340663

    申请日：1982-01-19

    申请人： Steven C. Leavitt ,  Hugh G. Larsen ,  Barry F. Hunt

    发明人： Steven C. Leavitt ,  Hugh G. Larsen ,  Barry F. Hunt

    IPC分类号： G01S7/52 ,  G01S7/531 ,  G06T11/00 ,  G06F15/20 ,  H04N5/02

    CPC分类号： G01S7/531 ,  G01S7/52063 ,  G06T1/00 ,  G06T3/4007

    摘要： Apparatus for displaying the information represented by data samples occurring along radial lines at display points arranged in rows and columns wherein intermediate interpolated data values are derived at the intersections of a row containing a display point for which a final data value is sought with radii on either side of the display point and interpolating the first and second intermediate interpolated data values so as to derive a final interpolated data value at the angular position of the display point with respect to the radii.

    摘要翻译： 用于显示沿着径向线发生的数据样本所表示的信息的装置，其以排和列排列的显示点出现，其中在包含要寻求最终数据值的显示点的行的交点处导出中间内插数据值， 并且内插第一和第二中间内插数据值，以便在显示点相对于半径的角位置导出最终内插数据值。

    Method and apparatus for signal dependent gain control
    3.
    发明授权
    Method and apparatus for signal dependent gain control 失效
    用于信号相关增益控制的方法和装置

    公开(公告)号：US5063931A

    公开(公告)日：1991-11-12

    申请号：US609312

    申请日：1990-11-05

    申请人： Steven C. Leavitt

    发明人： Steven C. Leavitt

    IPC分类号： A61B8/06 ,  G01P5/00 ,  G01S15/89

    CPC分类号： G01S15/8979 ,  A61B8/06 ,  Y10S73/90

    摘要： A method and apparatus are provided for gain control in a Doppler or other scan system which projects a plurality of scan lines at a given angle to determine velocity of movement of a predetermined medium at the angle. A training line is generated at the angle of the scan lines, the training line being utilized to determine portions of the scan line which are in a flow medium of interest, such as blood, and portions of the scan line which are in clutter. Information from the training line is then utilized to control the gain of the scan lines so that the gain is substantially maximized when scan lines are in the flow medium, while being reduced so as not to saturate the system in general, and A/D converters in particular, when in clutter. When an image line is utilized in the system, this line may also function as the training line.

    Medical ultrasound imaging system with velocity-dependent rejection filtering
    4.
    发明授权
    Medical ultrasound imaging system with velocity-dependent rejection filtering 失效
    医学超声成像系统与速度相关的拒绝滤波

    公开(公告)号：US4850364A

    公开(公告)日：1989-07-25

    申请号：US119754

    申请日：1987-11-12

    申请人： Steven C. Leavitt

    发明人： Steven C. Leavitt

    IPC分类号： G01P5/00 ,  A61B8/06 ,  G01F1/66 ,  G01S15/89

    CPC分类号： G01S15/8981

    摘要： A medical Doppler ultrasound imaging system with improved filtering to separate blood flow information from clutter due to heart wall and vessel motion. In combination with a clutter rejection filter and velocity determination system as in the prior art, a velocity sample rejection system implements a velocity-dependent (i.e., frequency-dependent) threshold for rejecting velocity values, or samples, based on too weak echoes. That is, the acceptance/rejection threshold is a function of frequency. Optimally, the shape of the velocity-dependent thresholding function closely matches that of the attenuation transfer function of the clutter rejection filter. Thuys, for low velocity samples (corresponding to low Doppler frequency shifts), the rejection threshold is substantially lower than it is for high velocity samples. The rejection level increases monotonically as the signal deviates from the I.F.

    Method and apparatus for the simultaneous performance of the beam formation and scan conversion in a phased array system
    6.
    发明授权
    Method and apparatus for the simultaneous performance of the beam formation and scan conversion in a phased array system 失效
    用于在相控阵系统中同时执行光束形成和扫描转换的方法和装置

    公开(公告)号：US5197037A

    公开(公告)日：1993-03-23

    申请号：US785669

    申请日：1991-10-31

    申请人： Steven C. Leavitt

    发明人： Steven C. Leavitt

    IPC分类号： A61B8/00 ,  G01N29/44 ,  G01S7/531 ,  G10K11/34

    CPC分类号： G10K11/345 ,  G01S7/52044

    摘要： A method and apparatus are provided for utilizing a digital front end in a phased array system such as an ultrasonic scanning system to simultaneously perform both digital beam formation and scan conversion. Echo signals from each of the N channels of the array aperture are sampled at selected points along returning echo signals. The samples are preferably used to determine a value for each channel for each pixel utilized in the display by, for example, determining a transmit time for such point. The values for each pixel for the N channels are then summed to obtain the value for the pixel. Alternatively, the samples may be taken at uniform intervals along each channel line and the sample values interpolated to obtain values at Y-boundary crossings or sampling may be taken at times determined so that each sample is at a Y-boundary crossing. The Y-boundary crossing sample values are stored and are then summed to obtain coherently enhanced sample values at the crossings. The sample values at the Y-boundary crossings may then be interpolated or otherwise utilized to obtain sample values for display pixels.