准静态超声弹性成像中基于正则化的二维应变张量成像SAGE出版物。

IF 2.5 4区 医学 Q1 ACOUSTICS
Anne-Lise Duroy, Valérie Detti, Agnès Coulon, Olivier Basset, Elisabeth Brusseau
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引用次数: 1

摘要

准静态超声弹性成像中所有应变分量的准确估计对生物介质的全面分析至关重要。在本研究中,研究了二维应变张量成像,重点是使用正则化方法来改进应变图像。该方法增强了(准)不可压缩性的组织特性,同时惩罚强场变化,以平滑位移场并降低应变分量中的噪声。该方法的性能通过数值模拟、模型和体内乳腺组织进行评估。对于所有被检测的介质,结果表明横向位移和应变都有显著的改善,而轴向场仅受到正则化的轻微改变。罚项的引入使我们能够获得剪切应变和旋转弹性图,其中夹杂物/病变周围的图案清晰可见。在幻象病例中,研究结果与实验建模所得结果一致。最后,在最终的横向应变图像中,更容易检测到夹杂物/病变与更高的弹性噪声对比比(cnr)相关,其值范围为[0.54-9.57],而正则化前的值为[0.08-0.38]。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Regularization-Based 2D Strain Tensor Imaging in Quasi-Static Ultrasound Elastography SAGE Publications.

Accurately estimating all strain components in quasi-static ultrasound elastography is crucial for the full analysis of biological media. In this study, 2D strain tensor imaging was investigated, focusing on the use of a regularization method to improve strain images. This method enforces the tissue property of (quasi-) incompressibility, while penalizing strong field variations, to smooth the displacement fields and reduce the noise in the strain components. The performance of the method was assessed with numerical simulations, phantoms, and in vivo breast tissues. For all the media examined, the results showed a significant improvement in both lateral displacement and strain, while axial fields were only slightly modified by the regularization. The introduction of penalty terms allowed us to obtain shear strain and rotation elastograms where the patterns around the inclusions/lesions were clearly visible. In phantom cases, the findings were consistent with the results obtained from the modeling of the experiments. Finally, the easier detectability of the inclusions/lesions in the final lateral strain images was associated with higher elastographic contrast-to-noise ratios (CNRs), with values in the range of [0.54-9.57] versus [0.08-0.38] before regularization.

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来源期刊
Ultrasonic Imaging
Ultrasonic Imaging 医学-工程:生物医学
CiteScore
5.10
自引率
8.70%
发文量
15
审稿时长
>12 weeks
期刊介绍: Ultrasonic Imaging provides rapid publication for original and exceptional papers concerned with the development and application of ultrasonic-imaging technology. Ultrasonic Imaging publishes articles in the following areas: theoretical and experimental aspects of advanced methods and instrumentation for imaging
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