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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Optimal apodization design for medical ultrasound using constrained least squares part II simulation results
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Optimal apodization design for medical ultrasound using constrained least squares part II simulation results

机译：约束最小二乘仿真结果的医用超声最佳切趾设计

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For Part I see ibid., vol. 54, p. 332-342 (2007). In the first part of this work, we introduced a novel general ultrasound apodization design method using constrained least squares (CLS). The technique allows for the design of system spatial impulse responses with narrow mainlobes and low sidelobes. In the linear constrained least squares (LCLS) formulation, the energy of the point spread function (PSF) outside a certain mainlobe boundary was minimized while maintaining a peak gain at the focus. In the quadratic constrained least squares (QCLS) formulation, the energy of the PSF outside a certain boundary was minimized, and the energy of the PSF inside the boundary was held constant. In this paper, we present simulation results that demonstrate the application of the CLS methods to obtain optimal system responses. We investigate the stability of the CLS apodization design methods with respect to errors in the assumed wave propagation speed. We also present simulation results that implement the CLS design techniques to improve cystic resolution. According to novel performance metrics, our apodization profiles improve cystic resolution by 3 dB to 10 dB over conventional apodizations such as the Hat, Hamming, and Nuttall windows. We also show results using the CLS techniques to improve conventional depth of field (DOF)
机译：对于第一部分，请参见同上。 54页。 332-342（2007）。在这项工作的第一部分中，我们介绍了一种使用约束最小二乘（CLS）的新颖的通用超声切趾设计方法。该技术允许设计具有窄主瓣和低旁瓣的系统空间脉冲响应。在线性约束最小二乘（LCLS）公式中，某个主瓣边界之外的点扩展函数（PSF）的能量被最小化，同时保持了焦点处的峰值增益。在二次约​​束最小二乘（QCLS）公式中，将某个边界外的PSF能量最小化，并将边界内的PSF能量保持恒定。在本文中，我们提供了仿真结果，这些仿真结果证明了CLS方法在获得最佳系统响应方面的应用。我们针对假设的波传播速度中的误差，研究了CLS切趾设计方法的稳定性。我们还介绍了实现CLS设计技术以提高囊性分辨率的模拟结果。根据新的性能指标，我们的切趾配置文件比常规切趾（例如Hat，Hamming和Nuttall窗口）将囊状分辨率提高了3 dB至10 dB。我们还显示了使用CLS技术改善常规景深（DOF）的结果

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