拉普拉斯域波束形成用于超快平面波成像
Laplace-Domain Beamforming for Ultrafast Plane-Wave Imaging
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中文总结 AI 辅助
针对超快平面波成像中傅里叶域方法因简化假设导致图像质量下降的问题，提出拉普拉斯域波束形成，利用拉普拉斯衍射定理考虑三维空间、有限阵元高度和有损耗组织，在保持计算效率的同时，体模实验证明其改善了均匀性、分辨率和对比度。
中文摘要 AI 辅助
傅里叶域波束形成方法，如滤波反投影（FBP），因其计算效率高和图像质量高而在超快平面波成像中具有优势。这些方法利用傅里叶衍射定理（FDT）对转向平面波进行精确反演线性散射模型。然而，这些模型依赖于简化假设，这些假设会降低图像质量。特别是使用线性换能器阵列需要：(i) 二维空间，以及 (ii) 无损耗组织。本文提出了拉普拉斯域波束形成方法。该方法保留了傅里叶域方法的计算效率，同时改善了线性阵列的图像质量。具体而言，该方法使用FDT的推广，此处称为拉普拉斯衍射定理，以考虑三个空间维度、有限的阵列单元高度和有损耗组织。一项体模实验表明，与FBP相比，所提出的方法改善了图像均匀性、空间分辨率和对比度。使用三个转向角，导线的横向和轴向-6 dB宽度分别减小了最多12%和25%，而无回声区域的对比度提高了最多9%。
英文摘要
Fourier-domain beamforming methods, such as filtered backpropagation (FBP), are beneficial in ultrafast plane-wave imaging due to their computational efficiency and high image quality. These methods use the Fourier diffraction theorem (FDT) for steered plane waves to exactly invert linear scattering models. However, these models rely on simplifying assumptions that degrade image quality. The use of linear transducer arrays, in particular, requires: (i) a two-dimensional space, and (ii) lossless tissues. Herein, Laplace-domain beamforming is proposed. This method retains the computational efficiency of the Fourier-domain methods while improving image quality for linear arrays. Specifically, the method uses a generalization of the FDT, here called Laplace diffraction theorem, to account for three spatial dimensions, finite array element heights, and lossy tissues. A phantom experiment showed that the proposed method improves image uniformity, spatial resolution, and contrast compared to FBP. Using three steering angles, the lateral and axial -6 dB-widths of wires reduced by up to 12% and 25%, respectively, while the contrast of anechoic regions improved by up to 9%.
发表机构
- Ruhr University Bochum（波鸿鲁尔大学）
机构由 AI 辅助整理，请以论文原文为准。
