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    • 53. 发明授权
    • Ultrasonic diagnosis apparatus
    • 超声诊断仪
    • US5188113A
    • 1993-02-23
    • US680163
    • 1991-04-03
    • Takeshi SatoSumiko Saito
    • Takeshi SatoSumiko Saito
    • A61B8/06G01S7/52G01S15/89
    • G01S15/8979A61B8/06A61B8/13G01S7/52074A61B8/488
    • An ultrasonic diagnosis apparatus comprises an ultrasonic probe for scanning ultrasonic waves in a cross-sectional area of a subject, and receiving the reflected ultrasonic waves, a B-mode processor for detecting the intensity of the reflected ultrasonic waves, thereby obtaining tomographic images of the subject, an MTI processor for detecting a Doppler shift of the reflected waves, thereby obtaining blood flow data representing the velocity and direction of blood flow in the tomographic image, and a coloring processing circuit for receiving the outputs of the B-mode processor and the MTI processor and coloring the blood flow part in a monochromatic tomographic image in accordance with the velocity and direction of the blood flow. A first digital scan converter is connected between the B-mode processor and the color processing circuit and a second digital scan converter is connected between the MTI processor and the color processing circuit. The first digital scan converter changes the scan direction for of the tomographic image and produces an interpolated tomographic image. The second digital scan converter changes the scan direction of scanning blood flow data, detects aliasing of blood data, and produces an interpolated blood flow data, the interpolation being controlled in accordance with the detection of aliasing.
    • 超声波诊断装置包括:超声波探头,用于在被检体的横截面积内扫描超声波,接收反射的超声波; B模式处理器,用于检测反射的超声波的强度,由此获得 用于检测反射波的多普勒频移的MTI处理器,从而获得表示断层图像中的血流速度和方向的血流数据,以及着色处理电路,用于接收B模式处理器和 MTI处理器,并根据血流的速度和方向将血流部分着色在单色断层图像中。 第一数字扫描转换器连接在B模式处理器和色彩处理电路之间,第二数字扫描转换器连接在MTI处理器和彩色处理电路之间。 第一数字扫描转换器改变断层图像的扫描方向并产生内插的断层图像。 第二数字扫描转换器改变扫描血流数据的扫描方向,检测血液数据的混叠,并产生内插的血流数据,根据混叠的检测来控制插值。
    • 55. 发明授权
    • Ultrasonic imaging apparatus
    • 超声波成像装置
    • US5081996A
    • 1992-01-21
    • US556524
    • 1990-07-24
    • Schuichi KawasakiNobuo YamazakiTakeshi Sato
    • Schuichi KawasakiNobuo YamazakiTakeshi Sato
    • G01N29/26A61B8/06G01S7/52G01S15/89
    • G01S15/8979B82Y15/00G01S15/8906G01S15/8977G01S7/52046G01S7/5206G01S7/52071G01S7/52085
    • An ultrasonic imaging apparatus comprises an ultrasonic transducer for transmitting ultrasonic beams to a subject and converting echoes from the subject to echo signals, a scan controller for selectively switching a scanning mode between a first scanning mode in which a predetermined number of rasters in each of a plurality of scanning blocks each having the predetermined number of rasters are scanned repeatedly and echo signals at a predetermined number of sample points in each of the rasters are extracted block by block and a second scanning mode in which a plurality of rasters are repeatedly scanned a predetermined number of times while at least one raster is shifted sequentially and data are output at constant intervals, a transmitter/receiver circuit for driving the ultrasonic transducer in accordance with a scanning mode selected by the scan controller, processes the echo signals output from the ultrasonic transducer to output an image signal and a television monitor for visually displaying the image signal.
    • 超声波成像装置包括用于将超声波束发射到对象并将来自受试者的回波转换成回波信号的超声波换能器,扫描控制器,用于在第一扫描模式之间有选择地切换扫描模式,在第一扫描模式中, 重复扫描具有预定数量的光栅的多个扫描块,并且逐块地提取每个光栅中的预定数量的采样点处的回波信号,并且第二扫描模式,其中多个光栅重复扫描预定的 在至少一个光栅顺序移位并以恒定间隔输出数据的次数的同时,根据由扫描控制器选择的扫描模式驱动超声波换能器的发射器/接收器电路处理从超声换能器输出的回波信号 以便视觉地输出图像信号和电视监视器 显示图像信号。
    • 56. 发明授权
    • Digital anti-aliasing filter
    • 数字抗混叠滤波器
    • US4970637A
    • 1990-11-13
    • US208489
    • 1988-06-20
    • Takeshi Sato
    • Takeshi Sato
    • H03H17/00G01S7/52H03H17/02H03H17/06
    • H03H17/0263G01S7/52028
    • An original analog signal is supplied to A/D converter 2 through analog LPF 1. LPF 1 has a cutoff frequency of fa/2 (fa is the frequency of a clock pulse supplied to A/D converter 2). LPF 1 limits a frequency band determined by filter characteristics. An output from A/D converter 2 is supplied to sample circuit 4 through maximum filter 3. An output from sample circuit 4 is supplied to a circuit of the next stage as final output Dout. Maximum filter 3 can arbitrarily set the number of sampling interval data (filter width). Maximum filter 3 is a nonlinear filter for outputting a maximum value of input data within a set filter width as a representative value of the width. The clock pulse of frequency fa is also supplied to maximum filter 3 so that input/output operation of data is synchronized with the clock pulse. The filter width of maximum filter 3 is determined in accordance with fa/fb (fb is the frequency of a clock pulse supplied to sample circuit 4 , and fa.gtoreq.fb).
    • 原始模拟信号通过模拟LPF 1提供给A / D转换器2. LPF 1的截止频率为fa / 2(fa是提供给A / D转换器2的时钟脉冲的频率)。 LPF 1限制由滤波器特性确定的频带。 来自A / D转换器2的输出通过最大滤波器3提供给采样电路4.来自采样电路4的输出被提供给下一级的电路作为最终输出Dout。 最大滤波器3可以任意设置采样间隔数据的数量(滤波器宽度)。 最大滤波器3是用于输出设定滤波器宽度内的输入数据的最大值作为宽度的代表值的非线性滤波器。 频率fa的时钟脉冲也被提供给最大滤波器3,使得数据的输入/输出操作与时钟脉冲同步。 根据fa / fb(fb是提供给采样电路4的时钟脉冲的频率,fa> / = fb)确定最大滤波器3的滤波器宽度。