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31. 发明授权

US5903516A Acoustic force generator for detection, imaging and information transmission using the beat signal of multiple intersecting sonic beams 失效
标题翻译：声力发生器，用于使用多个相交声波束的拍频信号进行检测，成像和信息传输
公开(公告)号：US5903516A
公开(公告)日：1999-05-11
申请号：US758879
申请日：1996-12-02
申请人： James F. Greenleaf , Mostafa Fatemi-Booshehri
发明人： James F. Greenleaf , Mostafa Fatemi-Booshehri
IPC分类号： G01S7/52 , G01S15/87 , G01S15/88 , G01S15/89 , G10K15/02 , G01S15/34
CPC分类号： G10K15/02 , G01S15/89 , G01S15/8952 , G01S15/87 , G01S15/88 , G01S7/52038
摘要： A force is produced within an object by two intersecting ultrasonic beams. The frequency of this force is equal to the beat frequency of the two intersecting beams when their frequencies are made different, or the force may vary as a function of a baseband audio signal f(t) that is used to modulate one of the two beams. The sonic waves produced at the intersection of the two beams can be used to detect the presence of objects or to image objects based on their mechanical properties, or to regenerate desired audio signals at the intersection.
摘要翻译：通过两个相交的超声波束在物体内产生力。这个力的频率等于它们的频率不同时两个交叉光束的拍频，或者力可以作为用于调制两个光束之一的基带音频信号f（t）的函数而变化。在两个光束的交点处产生的声波可以用于基于它们的机械特性来检测物体的存在或图像对象，或者在相交处再生期望的音频信号。

32. 发明授权

US5081995A Ultrasonic nondiffracting transducer 失效
$Ultrasonic nondiffracting transducer$
标题翻译：超声波非传导传感器
公开(公告)号：US5081995A
公开(公告)日：1992-01-21
申请号：US471457
申请日：1990-01-29
申请人： Jian-yu Lu , James F. Greenleaf
发明人： Jian-yu Lu , James F. Greenleaf
IPC分类号： G10K11/34
CPC分类号： G10K11/341
摘要： An ultrasonic transducer for use in medical imaging systems includes a piezoelectric element having an active electrode formed as a series of concentric annular segments. Each segment is separately driven by a transmitter in which the amplitude and phase of the drive signals produce an ultrasonic wave having a pressure profile that approxinmates a zeroth order Bessel function. A nondiffracting beam of ultrasonic waves is produced.
摘要翻译：用于医学成像系统的超声换能器包括具有形成为一系列同心环形段的有源电极的压电元件。每个段由发射机单独驱动，其中驱动信号的振幅和相位产生具有近似于零阶贝塞尔函数的压力分布的超声波。产生超声波的非衍射光束。

33. 发明授权

US4658827A Ultrasound scanner for tissue characterization 失效
标题翻译：用于组织表征的超声扫描仪
公开(公告)号：US4658827A
公开(公告)日：1987-04-21
申请号：US740178
申请日：1985-05-31
申请人： Ping He , James F. Greenleaf
发明人： Ping He , James F. Greenleaf
IPC分类号： G01S7/52 , G01S7/534 , A61B10/00
CPC分类号： G01S7/52026 , G01S7/52033 , G01S7/52036
摘要： Both the linear attenuation coefficient and an index describing the heterogeneity of the scatterers of tissue can be obtained simultaneously by the method and system disclosed herein. The system also produces a B-scan image with optimal time-variable gain compensation. The system combines an envelope peak method with a conventional ultrasound pulse-echo scanner. In this method, the peaks of the echo envelopes in a B-scan are multiplied by a controllable gain function. By adjusting the parameter of the gain function, the noise-to-signal ratio (NSR) of the envelope peaks is minimized. The minimum NSR can be used as an index to describe the heterogeneity of the tissue scatterers and the parameter of the gain function corresponding to the minimum NSR is equal to the attenuation coefficient of the tissue.
摘要翻译：可以通过本文公开的方法和系统同时获得线性衰减系数和描述组织散射体的异质性的指标。该系统还产生具有最佳时变增益补偿的B扫描图像。该系统将包络峰值方法与传统的超声脉冲回波扫描仪相结合。在该方法中，B扫描中的回波包络的峰值乘以可控增益函数。通过调整增益函数的参数，使包络峰值的噪声信噪比（NSR）最小化。最小NSR可用作描述组织散射体的异质性的指标，并且与最小NSR对应的增益函数的参数等于组织的衰减系数。

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