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    • 10. 发明授权
    • Method and apparatus for providing dynamically variable time delays for
ultrasound beamformer
    • 为超声波波束形成器提供动态可变时间延迟的方法和装置
    • US5844139A
    • 1998-12-01
    • US774667
    • 1996-12-30
    • Steven C. MillerGregory A. LillegardDaniel Milon
    • Steven C. MillerGregory A. LillegardDaniel Milon
    • G01N29/44A61B8/00G01S7/52G01S7/523G01S15/89G10K11/34H04R17/00G01N29/06G03B42/06
    • G10K11/345G01S7/52025G01S7/52034G01S7/52046
    • A phased array sector scanning ultrasonic system includes a separate receive channel for each respective element in an ultrasonic transducer array. Each receive channel imparts a delay to the echo signal produced by each respective element. The delayed echo signals are summed to form a steered, dynamically focused and dynamically windowed receive beam even when the transmit beam does not emanate from the center of the array. The receiver has a beamformer including a multiplicity of beamformer channels. The beamformer dynamically increases delays to each channel without introducing unwanted discontinuities, by combining and synchronizing a FIFO and an interpolator. The interpolator uses "Wallace tree" adders to accumulate bit-shifted versions of the inputs. The number of additions is less than the number of bits which would be needed to represent equivalent coefficients. This reduces the hardware relative to a conventional implementation which incorporates multipliers with shifts and adds equaling the number of bits in the coefficients.
    • 相控阵扫描超声系统包括用于超声换能器阵列中的每个相应元件的单独的接收通道。 每个接收通道对由每个相应元件产生的回波信号施加延迟。 延迟的回波信号被相加以形成转向,动态聚焦和动态窗口的接收波束,即使当发射波束不从阵列的中心发射时。 接收机具有包括多个波束形成信道的波束形成器。 波束形成器通过组合和同步FIFO和内插器,动态地增加每个通道的延迟,而不会引入不需要的不连续性。 插值器使用“华莱士树”加法器来积累输入的位移版本。 加法的数量小于表示等效系数所需的位数。 这降低了硬件相对于传统实现的结果,该实现结合了具有移位的乘法器并且增加了系数中的比特数。