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1. 发明授权

US06200266B1 Method and apparatus for ultrasound imaging using acoustic impedance reconstruction 失效
标题翻译：使用声阻抗重建的超声成像方法和装置
公开(公告)号：US06200266B1
公开(公告)日：2001-03-13
申请号：US09282215
申请日：1999-03-31
申请人： Nima Shokrollahi , William Tobocman , Sanford Roth , Joseph Izatt
发明人： Nima Shokrollahi , William Tobocman , Sanford Roth , Joseph Izatt
IPC分类号： A61B800
CPC分类号： G01S7/52061 , A61B8/0858 , A61B8/13 , G01S7/52036 , G01S7/52046 , G01S7/52069 , G01S15/8993
摘要： An ultrasound imaging system employs acoustic impedance reconstruction to produce high-resolution images of anatomical structures, which are virtually free of speckle. Determination of the acoustic impedance profile involves prefiltering of the incident ultrasound signal and the ultrasound signal reflected from the specimen to be imaged. A time domain window function is applied to both the incident and reflected signals, and an N-point FFT is computed for both the digitized incident and reflected signals to obtain the incident and reflected spectrums. A complex division of the reflected spectrum by the incident spectrum is performed to obtain the transfer function. A window function having a sharp, low-frequency cutoff is applied to the transfer function prior to performing an inverse FFT to obtain the estimated impulse response. The acoustic impedance of individual A-scans is calculated from the impulse response using the plane wave Born approximation, involving integration and exponentiation of the estimated impulse response. By mechanically or electronically scanning the transducer along a line, a series of A-scan acoustic impedance profiles are calculated and used to produce a two-dimensional, grey-scale B-scan image.
摘要翻译：超声成像系统采用声阻抗重建来产生解剖结构的高分辨率图像，其实质上不含斑点。声阻抗曲线的确定涉及入射超声信号的预滤波和从待成像的样本反射的超声信号。时域窗函数被应用于入射和反射信号，并且为数字入射和反射信号计算N点FFT以获得入射和反射光谱。进行入射光谱的反射光谱的复分割以获得传递函数。在执行逆FFT之前将具有尖锐的低频截止的窗函数应用于传递函数以获得估计的脉冲响应。使用平面波Born近似从脉冲响应计算各个A扫描的声阻抗，涉及估计的脉冲响应的积分和取幂。通过沿着一条线机械地或电子地扫描换能器，计算一系列A扫描声阻抗曲线并用于产生二维灰度B扫描图像。

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