在超声回波成像中卷积建模的衍射效应。
Convolutional modeling of diffraction effects in pulse-echo ultrasound imaging.
机构信息
Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio 45267, USA.
出版信息
J Acoust Soc Am. 2010 Sep;128(3):EL99-104. doi: 10.1121/1.3462233.
A model is presented for pulse-echo imaging of three-dimensional, linear, weakly-scattering continuum media by ultrasound array transducers. The model accounts for the diffracted fields of focused array subapertures in both transmit and receive modes, multiple transmit and receive focal zones, frequency-dependent attenuation, and aberration caused by mismatched medium and beamformer sound speeds. For a given medium reflectivity function, computation of a B-scan requires evaluation of a depth-dependent transmit/receive beam product, followed by two one-dimensional convolutions and a one-dimensional summation. Numerical results obtained using analytic expressions for transmit and receive beams agree favorably with measured B-scan images and speckle statistics.
提出了一种用于超声阵列换能器对三维线性弱散射连续介质进行脉冲回波成像的模型。该模型考虑了发射和接收模式下聚焦阵列子孔径的衍射场、多个发射和接收焦点区域、频率相关衰减以及由媒质和波束形成器声速不匹配引起的像差。对于给定的介质反射率函数，计算 B 扫描需要评估深度相关的发射/接收波束乘积，然后进行两次一维卷积和一次一维求和。使用发射和接收波束的解析表达式获得的数值结果与测量的 B 扫描图像和散斑统计数据吻合良好。
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