Experimental analysis of ray-based sound speed reconstruction algorithms for phase aberration corrected USCT SAFT imaging

Experimental analysis of ray-based sound speed reconstruction algorithms for phase aberration corrected USCT SAFT imaging
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基于射线的相位差校正USCT SAFT成像声速重建算法的实验分析

DOI:
10.1117/12.2512955
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
N.V. Ruiter
N.V. Ruiter
中科院分区:
--
文献类型:
--
作者:
T. Hopp;F. Zuch;M. Zapf;H. Gemmeke;N.V. Ruiter

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合成孔径聚焦技术(SAFT)是超声层析成像中常用的反射率成像技术。需要相位畸变校正以实现具有高分辨率和高对比度的图像,为此需要声速图。对于USCT系统,这些声速图通常使用来自原始数据集的透射数据来重建,其也用于反射层析成像。我们比较了直射线和弯曲射线相位畸变校正SAFT算法相对于不同的重建算法,以获得声速图。根据模拟体模和多模态超声乳腺成像系统(MUBI)的测量数据进行评价。相位像差校正使得能够恢复图像的对比度,而没有SAFT则导致内部结构相当不聚焦。然而,通过应用重建的声速图,与理想情况相比,局部对比度不能完全恢复。在所有情况下,引入基于快速行进或B ′ ezier曲线方法的弯曲射线透射重建方法改善了直射线透射层析成像的结果。
For Ultrasound Tomography reflectivity imaging Synthetic Aperture Focusing Technique (SAFT) is often applied. Phase aberration correction is required to achieve images with high resolution and high contrast, for which a sound speed map is required. For USCT systems these sound speed maps are usually reconstructed using the transmission data from the raw data set, which is also used for reflection tomography. We compare straight and bent ray phase aberration correction SAFT algorithms with respect to different reconstruction algorithms to derive the sound speed map. Evaluations are carried out based on a simulated phantom and measured data from the Multimodal Ultrasound Breast Imaging System (MUBI). Phase aberration correction enables recovering the contrast of the image, while without SAFT results in considerably unfocused inner structures. By applying a reconstructed sound speed map however the local contrast cannot be fully recovered compared to the ideal case. Introducing bent ray transmission reconstruction approaches based on the Fast Marching or B´ezier curve method in all cases improves the results over the straight ray transmission tomography.
用于乳腺癌成像的逆散射和折射校正反射
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影响因子: --
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DOI: --
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