公开(公告)号：US20080095490A1

公开(公告)日：2008-04-24

申请号：US11662154

申请日：2005-09-08

申请人： Shai Ashkenazi ,  Lingjie J. Guo ,  Matthew O'Donnell

发明人： Shai Ashkenazi ,  Lingjie J. Guo ,  Matthew O'Donnell

IPC分类号： G02B6/00

CPC分类号： G02B6/12007 ,  A61B5/0097 ,  G01H9/004 ,  G02B6/1221

摘要： A polymer waveguide resonator device for high-frequency ultrasound detection having a optical resonator coupled to a straight optical waveguide which serves as input and output ports. Acoustic waves irradiating the waveguide induce strain modifying the waveguide cross-section or other design property. As a consequence, the effective refractive index of optical waves propagating along the ring is modified. The sharp wavelength dependence of the high Q-factor resonator enhances the optical response to acoustic strain. High sensitivity is demonstrated experimentally in detecting broadband ultrasound pulses from a 10 MHz transducer.

摘要翻译： 一种用于高频超声检测的聚合物波导谐振器装置，其具有耦合到用作输入和输出端口的直线光波导的光谐振器。 辐射波导的声波诱导应变调整波导横截面或其他设计特性。 因此，沿着环传播的光波的有效折射率被改变。 高Q因子谐振器的尖锐波长依赖性增强了对声学应变的光学响应。 在10 MHz传感器检测宽带超声波脉冲中，实验证明了高灵敏度。

公开(公告)号：US06780157B2

公开(公告)日：2004-08-24

申请号：US10174412

申请日：2002-06-18

申请人： Douglas N. Stephens ,  Matthew O'Donnell

发明人： Douglas N. Stephens ,  Matthew O'Donnell

IPC分类号： A61B814

CPC分类号： B06B1/0633 ,  A61B8/12 ,  A61B8/445 ,  A61B8/4488 ,  Y10T29/42

摘要： An ultrasound transducer array (408) includes at least one transducer element (412) having a first (604) and second (606) portions separated by an acoustical discontinuity (520). The first portion (604) has the desired length to form a half-wave k31 resonance, while the second portion (606) has a resonant length for an undesired very low frequency out-of-band k31 resonance. The thickness of the transducer element (412) is designed for k33 half-resonance. Given the design, the transducer element (412) can operate and provide for both forward-looking (514) and side looking (512) elevation apertures. A method is also disclosed for using the disclosed ultrasound transducer (412) in ultrasound imaging.

摘要翻译： 超声换能器阵列（408）包括至少一个换能器元件（412），该换能器元件具有由声学不连续性（520）隔开的第一（604）和第二（606）部分。 第一部分（604）具有期望的长度以形成半波k31谐振，而第二部分（606）具有用于不期望的非常低频带外k31谐振的谐振长度。 换能器元件（412）的厚度被设计用于k33半共振。 考虑到设计，换能器元件（412）可以操作并提供前视（514）和侧视（512）仰角孔。 还公开了在超声成像中使用所公开的超声换能器（412）的方法。

公开(公告)号：US06579238B1

公开(公告)日：2003-06-17

申请号：US09791405

申请日：2001-02-23

申请人： Constantine Simopoulos ,  Kutay F. Üstüner ,  Anming He Cai ,  Jeffrey T. Rahn ,  John Jackson ,  Matthew O'Donnell

发明人： Constantine Simopoulos ,  Kutay F. Üstüner ,  Anming He Cai ,  Jeffrey T. Rahn ,  John Jackson ,  Matthew O'Donnell

IPC分类号： A61B800

CPC分类号： G01S15/8988 ,  A61B8/14 ,  G01S7/52026 ,  G01S7/52033 ,  G01S7/52034 ,  G01S7/52036

摘要： A medical ultrasonic imaging system uses an adaptive multi-dimensional back-end mapping stage to eliminate loss of information in the back-end, minimize any back-end quantization noise, reduce or eliminate electronic noise, and map the local average of soft tissue to a target display value throughout the image. The system uses spatial variance to identify regions of the image corresponding substantially to soft tissue and a noise frame acquired with the transmitters turned off to determine the mean system noise level. The system then uses the mean noise level and the identified regions of soft tissue to both locally and adaptively set various back-end mapping stages, including the gain and dynamic range.

公开(公告)号：US06208189B1

公开(公告)日：2001-03-27

申请号：US09358039

申请日：1999-07-20

申请人： Steven R. Freeman ,  Matthew O'Donnell ,  Thomas E. Linnenbrink ,  Marc A. Morin ,  Marshall K. Quick ,  Charles S. Desilets

发明人： Steven R. Freeman ,  Matthew O'Donnell ,  Thomas E. Linnenbrink ,  Marc A. Morin ,  Marshall K. Quick ,  Charles S. Desilets

IPC分类号： H03H1126

CPC分类号： G01S7/5208 ,  G01S7/52028 ,  G01S7/52034 ,  G01S7/52095 ,  G01S15/8927 ,  H03M3/324 ,  H03M3/43 ,  H03M3/454 ,  H03M3/504

摘要： A method and apparatus are provided for reducing distortion in a dynamically delayed digital sample stream of an imaging system. The method includes the steps of delta-sigma modulating an input analog signal of the imaging system at a frequency above the Nyquist frequency of the input analog signal to generate a digital sample stream and changing a length of the sample stream to delay a portion of the sample stream while maintaining synchronism between a delta-sigma modulator and a demodulator of the system.

摘要翻译： 提供了一种用于减少成像系统的动态延迟的数字样本流中的失真的方法和装置。 该方法包括以高于输入模拟信号的奈奎斯特频率的频率调制成像系统的输入模拟信号的Δ-sigma步骤，以产生数字样本流并改变样本流的长度以延迟部分 同时保持Δ-Σ调制器和系统的解调器之间的同步。

公开(公告)号：US5921931A

公开(公告)日：1999-07-13

申请号：US827724

申请日：1997-04-08

申请人： Matthew O'Donnell ,  Michael J. Eberle ,  Douglas N. Stephens ,  Gerald Litzza ,  Randy Ziegenbein ,  David Bleam ,  Ching-Chen Wu

发明人： Matthew O'Donnell ,  Michael J. Eberle ,  Douglas N. Stephens ,  Gerald Litzza ,  Randy Ziegenbein ,  David Bleam ,  Ching-Chen Wu

IPC分类号： A61B8/06 ,  A61B8/12 ,  G01S7/52 ,  G01S15/89 ,  A61B8/00

CPC分类号： G01S15/8979 ,  A61B8/06 ,  A61B8/13 ,  G01S7/52026 ,  G01S7/52071

摘要： A blood flow detection and imaging method and system is described for displaying images in accordance with signals transmitted from an intravascular ultrasound transducer probe. The image processor includes means for independently designating persistence factors for smoothing calculated speed and power of the dynamic portion of a field of view within a vasculature. Furthermore, the designation of a particular image point within a field of view as a dynamic image point (such as a blood flow region) as opposed to a static image point (such as a tissue region) is determined by averaging signal values for image points proximate to an image point of interest over both time and space.

摘要翻译： 描述了血流检测和成像方法和系统，用于根据从血管内超声换能器探头发送的信号显示图像。 图像处理器包括用于独立地指定持久性因子的装置，用于平滑脉管系统内的视场的动态部分的计算速度和功率。 此外，通过对图像点的信号值进行平均，确定与静态图像点（例如组织区域）相对的作为动态图像点（例如血流区域）的视野内的特定图像点的指定 接近于时间和空间上的图像感兴趣点。

公开(公告)号：US5476098A

公开(公告)日：1995-12-19

申请号：US387513

申请日：1995-02-13

申请人： Matthew O'Donnell

发明人： Matthew O'Donnell

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

CPC分类号： G01S15/8918 ,  G01S7/52017 ,  G01S7/52033

摘要： Ultrasonic imaging performed with a large aperture phased array employs partially coherent processing to provide an improved real-time ultrasound image compared to that obtainable using either fully coherent or fully incoherent processing. Partially coherent processing is achieved by computing different sums across the imaging aperture and using a weighted total of the computed sums to generate a real-time image, enabling the operator to choose the extent of coherent summation versus incoherent summation across the aperture. Since coherent summation affects spatial resolution and incoherent summation affects contrast resolution, a trade-off between spatial and contrast resolution results in an optimal image for a given application.

摘要翻译： 使用大孔径相控阵列进行的超声成像使用部分相干处理来提供改进的实时超声图像，与使用完全相干或完全非相干处理可获得的超声图像相比。 通过在成像孔径上计算不同的和并且使用计算的和的加权总和来生成实时图像来实现部分相干处理，使得操作者能够选择跨越孔径的相干求和的程度。 由于相干相加影响空间分辨率和非相干相加影响对比度分辨率，因此空间和对比度分辨率之间的权衡导致给定应用的最佳图像。

公开(公告)号：US5453575A

公开(公告)日：1995-09-26

申请号：US234848

申请日：1994-04-28

申请人： Matthew O'Donnell ,  Michael J. Eberle ,  Douglas N. Stephens ,  Gerald L. Litzza ,  Daniel S. Haviland

发明人： Matthew O'Donnell ,  Michael J. Eberle ,  Douglas N. Stephens ,  Gerald L. Litzza ,  Daniel S. Haviland

IPC分类号： A61B8/06 ,  A61B8/12 ,  A61B8/14 ,  B06B1/02 ,  B06B1/06 ,  G01S15/89 ,  G10K11/00

CPC分类号： A61B8/06 ,  A61B8/12 ,  A61B8/4483 ,  A61B8/4488 ,  A61B8/4494 ,  B06B1/0633 ,  B06B1/067 ,  B06B1/0674 ,  G01S15/892 ,  G01S15/8979 ,  G01S15/899 ,  G10K11/004 ,  G10K11/008 ,  A61B8/445 ,  B06B2201/76 ,  G01S15/8981 ,  Y10T29/42

摘要： An apparatus and method are described for imaging blood flow from within a vasculature. An ultrasound catheter probe carrying an ultrasound transducer array is inserted within a blood vessel. The transducer array emits ultrasound excitation signals and receives ultrasound echo waveforms reflected from blood and tissue in a region of the vasculature. A series of the echo waveforms resulting from a series of excitation signals are combined in a manner such that the echo signals from static features in the region, such as tissue and plaque, are significantly attenuated. The combined signal primarily represents the relatively dynamic features in the region (i.e. the blood flow). A blood flow image is constructed from the combined signal. The blood flow image is colorized and combined with an image of the relatively static features in the region. Thereafter, the combined image is displayed on a video display.

摘要翻译： 描述了用于对脉管系统内的血流进行成像的装置和方法。 携带超声波换能器阵列的超声波导管探针插入血管内。 换能器阵列发射超声激发信号并且接收从脉管系统区域中的血液和组织反射的超声回波波形。 由一系列激励信号产生的一系列回波波形以这样的方式组合，使得来自该区域中的静态特征（例如组织和斑块）的回波信号被显着衰减。 组合信号主要表示该区域中相对动态的特征（即，血流）。 血液流动图像由组合信号构成。 血流图像被着色并与该区域中相对静态特征的图像组合。 此后，组合的图像显示在视频显示器上。

公开(公告)号：US5172343A

公开(公告)日：1992-12-15

申请号：US802804

申请日：1991-12-06

申请人： Matthew O'Donnell

发明人： Matthew O'Donnell

IPC分类号： A61B8/14 ,  G01N29/30 ,  G01N29/44 ,  G01S7/52 ,  G10K11/34

CPC分类号： G10K11/345 ,  G01N29/0645 ,  G01N29/30 ,  G01S7/52047 ,  G01S7/52049 ,  G01S7/52095

摘要： A PASS ultrasonic system performs a scan in which phase errors due to aberrations in the sound media are corrected prior to the acquisition of each beam. Phase errors are measured by cross correlating each of a set of reference beams with the desired beam to produce beam forming errors as a function of beam angle. This function is Fourier transformed to produce phase corrections that are employed by the ultrasonic system to offset the phase errors.

公开(公告)号：US5005419A

公开(公告)日：1991-04-09

申请号：US207532

申请日：1988-06-16

申请人： Matthew O'Donnell ,  Kenneth B. Welles, II ,  Carl R. Crawford ,  Norbert J. Pelc ,  Steven G. Karr

发明人： Matthew O'Donnell ,  Kenneth B. Welles, II ,  Carl R. Crawford ,  Norbert J. Pelc ,  Steven G. Karr

IPC分类号： A61B8/00 ,  G01N29/06 ,  G01S7/52 ,  G01S7/526 ,  G01S15/89 ,  G06T1/00

CPC分类号： G01S7/52023 ,  G01S15/8915

摘要： A method and apparatus for improved digital processing of the analog echo signals in a coherent imaging system is described which simplifies the channel circuitry requirements. The analog echo signals detected with a phased array of transducer elements are first compressed in a non-linear manner then expanded non-linearly with analog-to-digital converter means to provide increased instantaneous dynamic range in the overall system. Representative phased array coherent imaging systems having the improved digital processing means are also disclosed.

摘要翻译： 描述了一种用于改进相干成像系统中的模拟回波信号的数字处理的方法和装置，其简化了信道电路要求。 用相控阵的换能器元件检测的模拟回波信号首先以非线性方式压缩，然后以模数转换器装置非线性地扩展，以在整个系统中提供增加的瞬时动态范围。 还公开了具有改进的数字处理装置的代表性相控阵相干成像系统。

公开(公告)号：US4809184A

公开(公告)日：1989-02-28

申请号：US944482

申请日：1986-12-19

申请人： Matthew O'Donnell ,  Mark G. Magrane

发明人： Matthew O'Donnell ,  Mark G. Magrane

IPC分类号： A61B8/00 ,  G01N29/04 ,  G01N29/06 ,  G01N29/38 ,  G01S7/52 ,  G01S7/523 ,  G01S15/89 ,  G10K11/34 ,  G01N29/00

CPC分类号： G01S7/52046 ,  G01S15/8918 ,  G10K11/346

摘要： A method for steering a beam of vibratory energy to a desired angle .theta. with respect to the plane of an array of transducers, uses apparatus which generates a plurality of sampling strobe sequences with each strobe pulse occurring at a time interval T after the preceding strobe pulse, where T satisfies the Nyquist condition. A different one S.sub.j of the strobe signals is assigned to each different transducer channel and the commencement time of the strobe signal in each channel is offset by a time interval which is a first positive integer multiple M.sub.j, selected for each angle .theta., of an offset time interval which is not greater than 1/32nd of the reciprocal of the ultrasonic excitation frequency F.sub.u. Each strobe signal triggers conversion of the present amplitude of the return signal directly to a digital data word; the apparatus then digitally delays each data word in each of the N channels for a delay time interval selected to cause the delayed data words from all N channels, when coherently summed, to represent any change in reflectance in the beam at the desired angle .theta..

摘要翻译： 一种用于将振动能量束相对于换能器阵列的平面转向所需角度θ的方法，使用生成多个采样选通序列的装置，每个选通脉冲在先前的选通脉冲之后以时间间隔T出现 ，其中T满足奈奎斯特条件。 将选通信号的不同的一个Sj分配给每个不同的换能器通道，并且每个通道中的选通信号的开始时间被偏移一个时间间隔，该时间间隔是为每个角度θ选择的偏移量的第一正整数倍Mj 时间间隔不大于超声波激发频率Fu的倒数的1/32。 每个选通信号触发将信号的当前振幅直接转换为数字数据字; 该装置然后数字地延迟每个N个信道中的每个数据字，以延迟时间间隔被选择以使相干相加的来自所有N个信道的延迟的数据字表示在期望角度θ处的光束中的反射率的任何变化。