arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10024physics.med-ph
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孔径、深度和声杂波对相干多换能器超声成像性能的影响

Impact of aperture, depth, and acoustic clutter on performance of Coherent Multi-Transducer Ultrasound imaging

Laura Peralta, Alessandro Ramalli, Michael Reinwald, Robert J. Eckersley, Joseph V. Hajnal

摘要:

在超声成像中期望具有较大孔径尺寸的换能器以提高分辨率和图像质量。相干多换能器超声成像系统(CoMTUS)通过多个换能器的相干组合实现扩展的有效孔径。在这项研究中,不连续的扩展孔径创建的CoMTUS及其性能的深层成像和通过分层介质的模拟和实验研究。典型的图像质量指标-分辨率,对比度和对比度噪声比-进行评估和比较,与标准的单探头成像系统。结果表明,CoMTUS的图像性能取决于阵列的相对空间位置。由此产生的有效孔径显著提高了分辨率,而阵列之间的间隔可能会降低对比度。对于有效孔径中的有限间隙(小于几厘米),与标准单探头成像系统相比,CoMTUS提供了图像质量方面的优势。总的来说,CoMTUS显示出更高的灵敏度和降低的分辨率损失与成像深度。一般来说,当通过具有不同声速值的分层介质成像时,CoMTUS成像性能不受影响,并且在大成像深度下分辨率可提高高达80%。

英文摘要:

Transducers with larger aperture size are desirable in ultrasound imaging to improve resolution and image quality. A coherent multi-transducer ultrasound imaging system (CoMTUS) enables an extended effective aperture through coherent combination of multiple transducers. In this study, the discontinuous extended aperture created by CoMTUS and its performance for deep imaging and through layered-media are investigated by both simulations and experiments. Typical image quality metrics - resolution, contrast and contrast-to-noise ratio - are evaluated and compared with a standard single probe imaging system. Results suggest that, the image performance of CoMTUS depends on the relative spatial location of the arrays. The resulting effective aperture significantly improves resolution, while the separation between the arrays may degrade contrast. For a limited gap in the effective aperture (less than few centimetres), CoMTUS provides benefits to image quality compared to standard single probe imaging system. Overall, CoMTUS shows higher sensitivity and reduced loss of resolution with imaging depth. In general, CoMTUS imaging performance was unaffected when imaging through a layered-medium with different speed of sound values and resolution improved up to 80% at large imaging depths.

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