Phase-aberration correction with a 3-D ultrasound scanner: Feasibility study
Phase-aberration correction with a 3-D ultrasound scanner: Feasibility study
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DOI：
10.1109/tuffc.2006.1665100
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发表时间：
2006-08-01
影响因子：
3.6
通讯作者：
Smith, Stephen W.
中科院分区：
文献类型：
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作者：
Ivancevich, Nikolas M.;Dahl, Jeremy J.;Smith, Stephen W.
我们测试了使用二维（2-D）阵列和实时3-D超声自适应成像（即相位像差校正）的可行性。由于像差的空间频率含量高，通常具有较小间距和较高空间采样频率的二维阵列和三维成像显示出改善自适应成像性能的潜力。相位校正算法通过补偿波束形成过程中组织引起的误差来提高图像质量。以经颅超声为例，我们评估了我们使用实时三维扫描仪进行自适应成像的能力。我们使用了人类颞骨的聚合物铸型，均方根（RMS）相位变化为45.0 ns，全宽-半宽（FWHM）相关长度为3.35 mm，电子像差，100 ns RMS， 3.76 mm相关，组织幻影作为近场相屏像差的示例。利用多重滞后、最小二乘和互相关方法，我们展示了3D自适应成像提高消声囊肿识别、图像亮度、对比度-散斑比（CSR）的能力，以及在3D彩色多普勒实验中可视化血流的能力。对于物理畸变颅骨铸造，我们看到CSR从1.01增加到1.14，增加了13%，而可检测的囊肿数量从4.3增加到7.7。
We tested the feasibility of using adaptive imaging, namely phase-aberration correction, with two-dimensional (2-D) arrays and real-time, 3-D ultrasound. Because of the high spatial frequency content of aberrators, 2-D arrays, which generally have smaller pitch and thus higher spatial sampling frequency, and 3-D imaging show potential to improve the performance of adaptive imaging. Phase-correction algorithms improve image quality by compensating for tissue-induced errors in beamforming. Using the illustrative example of transcranial ultrasound, we have evaluated our ability to perform adaptive imaging with a real-time, 3-D scanner. We have used a polymer casting of a human temporal bone, root-mean-square (RMS) phase variation of 45.0 ns, full-width-half-maximum (FWHM) correlation length of 3.35 mm, and an electronic aberrator, 100 ns RMS, 3.76 mm correlation, with tissue phantoms as illustrative examples of near-field, phase-screen aberrators. Using the multilag, least-squares, cross-correlation method, we have shown the ability of 3D adaptive imaging to increase anechoic cyst identification, image brightness, contrast-to-speckle ratio (CSR), and, in 3-D color Doppler experiments, the ability to visualize flow. For a physical aberrator skull casting we saw CSR increase by 13% from 1.01 to 1.14, while the number of detectable cysts increased from 4.3 to 7.7.