公开(公告)号：US06443897B1

公开(公告)日：2002-09-03

申请号：US09750869

申请日：2000-12-28

申请人： David T. Dubberstein ,  Steven C. Miller

发明人： David T. Dubberstein ,  Steven C. Miller

IPC分类号： A61B0800

CPC分类号： G10K11/346

摘要： A method and an apparatus for correcting refraction delay errors on curved probes for all ranges using cordic rotation. The angle &phgr; from the normal of an element to the focus is determined as a function of the angle of cordic rotation. Then a delay error correction is indexed using this angle &phgr;. The angular correction method is efficient in that it uses the inherent property of cordic rotation to calculate the only range-dependent variable required for the correction. Thus the additional hardware required to calculate the corrections is minimal, as the remaining correction variables are vector and range independent.

摘要翻译： 一种用于校正所有范围的弯曲探针上的折射延迟误差的方法和装置，其使用线性旋转。 从元件的法线到焦点的角度phi被确定为帘线旋转角度的函数。 然后使用该角度phi对延迟误差校正进行索引。 角度校正方法是有效的，因为它使用线性旋转的固有属性来计算校正所需的唯一的范围因变量。 因此，计算校正所需的附加硬件是最小的，因为剩余的校正变量是向量和范围无关的。

公开(公告)号：US06159153A

公开(公告)日：2000-12-12

申请号：US224746

申请日：1998-12-31

申请人： David T. Dubberstein ,  Olaf T. von Ramm

发明人： David T. Dubberstein ,  Olaf T. von Ramm

IPC分类号： A61B8/06 ,  A61B8/08 ,  G01S7/52 ,  G01S15/89 ,  A61B8/00

CPC分类号： G01S7/52085 ,  A61B8/06 ,  G01S15/8915 ,  G01S7/52034 ,  G01S7/52092 ,  A61B8/08 ,  Y10S128/916

摘要： Multiple transmit ultrasound beams are generated by an ultrasound transducer at different frequencies in different directions in a region of a body during a maximum scan range interval. Transmitting multiple transmit ultrasound beams during the maximum scan range interval may provide an increase in the data acquisition rate compared to conventional ultrasound imaging systems. The transmit ultrasound beams are tracked using parallel receive processing and filtered to provide ultrasound scan lines for display. The respective directions of the transmit ultrasound beams are selected to define a separation angle therebetween which may reduce interference between the transmit ultrasound beams. The maximum scan range interval includes a time interval from a first start time to a second start time which is less than a total time for one of the transmit ultrasound beams to propagate to a maximum scan range in the region and a corresponding reflected transmit ultrasound beam to propagate from the maximum scan range to the ultrasound transducer. The ultrasound scan lines are displayed using a line-by-line frequency interlace pattern which may reduce the effect of frequency dependent attenuation in the region. The line-by-line frequency interlacing may also reduce a difference in speckle size due to the different frequencies.

摘要翻译： 在最大扫描范围间隔期间，多个发射超声波束在身体区域中以不同方向的不同频率的超声波换能器产生。 与传统的超声成像系统相比，在最大扫描范围间隔期间发送多个发射超声波束可以提供数据采集速率的增加。 使用并行接收处理跟踪发射超声波束，并对其进行滤波以提供用于显示的超声波扫描线。 选择发射超声波束的各个方向以限定它们之间的间隔角，这可以减小发射超声波束之间的干扰。 最大扫描范围间隔包括从第一开始时间到第二开始时间的时间间隔，其小于发射超声波束之一传播到该区域中的最大扫描范围的总时间，以及对应的反射发射超声波束 从最大扫描范围传播到超声换能器。 使用逐行频率交错模式显示超声扫描线，其可以减少该区域中频率相关衰减的影响。 逐行频率交错也可以减少由于不同频率导致的散斑尺寸差异。

公开(公告)号：US06267725B1

公开(公告)日：2001-07-31

申请号：US09395343

申请日：1999-09-13

申请人： David T. Dubberstein

发明人： David T. Dubberstein

IPC分类号： A61B800

CPC分类号： G01S15/8988 ,  A61B8/06 ,  G01S7/52033 ,  G01S7/52034 ,  G01S15/8979

摘要： A method and an apparatus for wall filtering the receive signal in each receive channel of an ultrasound imaging system prior to analog-to-digital conversion. Large-amplitude echoes corresponding to stationary or very slow-moving tissue are removed before they saturate the inputs to the analog-to-digital converters (ADCs) in the receive channels. By first removing the wall signal, the gain of the TIC amplifier in the receive channel can be increased without saturating the (ADC). This additional amplification will increase the small flow signals, mapping them into higher bits of the ADC, thereby allowing more sensitive detection of weak blood flow in the human body.

摘要翻译： 一种用于在模数转换之前对超声成像系统的每个接收通道中的接收信号进行壁过滤的方法和装置。 对应于静止或非常缓慢运动的组织的大振幅回波在它们将接收信道中的模数转换器（ADC）的输入饱和之前被去除。 首先消除墙壁信号，可以增加接收通道中的TIC放大器的增益，而不会使（ADC）饱和。 这种额外的放大将增加小流量信号，将其映射到ADC的较高位，从而允许更灵敏地检测人体中的弱血流。