利用基于径向基函数的重构减轻剪切波弹性成像的高帧频要求:实验模型研究

IF 3.8 2区 物理与天体物理 Q1 ACOUSTICS
Sajjad Afrakhteh, Libertario Demi
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引用次数: 0

摘要

背景:剪切波弹性成像(SWE)是一种通过评估剪切波受声辐射力激发后的传播速度来量化组织硬度的技术。剪切波弹性成像可量化弹性组织特性,是传统超声技术的辅助手段,有助于组织特征描述。要捕捉剪切波的这种瞬态传播,超声设备必须能够达到非常高的帧频:本文旨在放宽对 SWE 成像的高帧频要求。为此,我们提出了降低 SWE 成像帧频的建议,然后采用基于径向基函数 (RBF) 的二维 (2D) 插值。更具体地说,这一过程包括获取低帧频数据,然后通过在两个连续图像帧之间插入缺失值的 "UpS-1 "图像帧(UpS:升采样率)进行时间升采样,以合成高帧频数据。最后,我们应用所提出的插值技术来重建不完整的高帧率数据中的缺失值:在两个实验数据集上使用所提出的模型得出的结果表明,我们可以将 SWE 成像的帧速率要求放宽 4 倍,同时保持剪切波速度(SWS)、群速度和相位速度估计值与高帧速率 SWE 模型密切吻合,使误差小于 3%。此外,对二维-SWS 地图的结构相似性指数(SSIM)和均方根误差(RMSE)的分析突出表明,即使在下采样(DS)因子为 4 的情况下,所建议的技术在提高局部 SWS 估计值方面也很有效。此外,RMSE 值低于 0.37 m/s,这表明所提技术在重构 SWS 值方面性能良好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mitigating high frame rate demands in shear wave elastography using radial basis function-based reconstruction: An experimental phantom study.

Background: Shear wave elastography (SWE) is a technique that quantifies tissue stiffness by assessing the speed of shear waves propagating after being excited by acoustic radiation force. SWE allows the quantification of elastic tissue properties and serves as an adjunct to conventional ultrasound techniques, aiding in tissue characterization. To capture this transient propagation of the shear wave, the ultrasound device must be able to reach very high frame rates.

Methodology: In this paper, our aim is to relax the high frame rate requirement for SWE imaging. To this end, we propose lower frame rate SWE imaging followed by employing a 2-dimensional (2D) radial basis functions (RBF)-based interpolation. More specifically, the process involves obtaining low frame rate data and then temporal upsampling to reach a synthetic high frame rate data by inserting the 'UpS-1' image frames with missing values between two successive image frames (UpS: Upsampling rate). Finally, we apply the proposed interpolation technique to reconstruct the missing values within the incomplete high frame rate data.

Results and conclusion: The results obtained from employing the proposed model on two experimental datasets indicate that we can relax the frame rate requirement of SWE imaging by a factor of 4 while maintaining shear wave speed (SWS), group velocity, and phase velocity estimates closely align with the high frame rate SWE model so that the error is less than 3%. Furthermore, analysis of the structural similarity index (SSIM) and root mean squared error (RMSE) on the 2D-SWS maps highlights the efficacy of the suggested technique in enhancing local SWS estimates, even at a downsampling (DS) factor of 4. For DS≤4, the SSIM values between the 2D-SWS maps produced by the proposed technique and those generated by the original high frame rate data consistently remain above 0.94. Additionally, the RMSE values is below 0.37 m/s, indicating promising performance of the proposed technique in reconstruction of SWS values.

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来源期刊
Ultrasonics
Ultrasonics 医学-核医学
CiteScore
7.60
自引率
19.00%
发文量
186
审稿时长
3.9 months
期刊介绍: Ultrasonics is the only internationally established journal which covers the entire field of ultrasound research and technology and all its many applications. Ultrasonics contains a variety of sections to keep readers fully informed and up-to-date on the whole spectrum of research and development throughout the world. Ultrasonics publishes papers of exceptional quality and of relevance to both academia and industry. Manuscripts in which ultrasonics is a central issue and not simply an incidental tool or minor issue, are welcomed. As well as top quality original research papers and review articles by world renowned experts, Ultrasonics also regularly features short communications, a calendar of forthcoming events and special issues dedicated to topical subjects.
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