论文标题
菱形网格减少快速脉冲 - 回声超声成像中的体素数量
Rhombic Grids Reduce the Number of Voxels in Fast Pulse-Echo Ultrasound Imaging
论文作者
论文摘要
超快成像模式，例如相干平面波化合物（CPWC），使用平行接收焦点在单个脉冲回波测量中捕获了一个较大的视野。图像中焦点的数量或等效的量元素数（体素）的数量决定了图像形成的计算成本和记忆消耗。在此，提出了120°菱形网格来指定体素位置并减少与正交网格相比的体素数量。所提出的网格源自CPWC中延迟和-AM算法形成的图像的双变量采样定理和光谱特性。幻影实验验证了所提出的网格，与通常和最佳的正交网格相比，体素数量分别减少了81.4％和14.7％。平均结构相似性指数高于96.6％，而相对根均值误差低于6.8％，证实了插值与通常的正交网格后所有图像的视觉等效性。
Ultrafast imaging modes, such as coherent plane-wave compounding (CPWC), capture a large field of view in a single pulse-echo measurement using parallel receive focusing. The number of foci or, equivalently, the number of volume elements (voxels) in the image determines the computational costs and the memory consumption of the image formation. Herein, 120° rhombic grids are proposed to specify the voxel positions and reduce the number of voxels in comparison to orthogonal grids. The proposed grids derive from the bivariate sampling theorem and the spectral properties of the images formed by the delay-and-sum algorithm in CPWC. A phantom experiment validated the proposed grids and showed reductions in the number of voxels by 81.4 % and 14.7 % in comparison to the usual and optimal orthogonal grids, respectively. Mean structural similarity indices above 96.6 % and relative root mean-squared errors below 6.8 % confirmed the visual equivalence of all images after interpolations to the usual orthogonal grid.
