Computational methods for quantifying in vivo muscle fascicle curvature from ultrasound images
Computational methods for quantifying in vivo muscle fascicle curvature from ultrasound images
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DOI：
10.1016/j.jbiomech.2011.07.017
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发表时间：
2011-09-23
影响因子：
2.4
通讯作者：
Wakeling, James M.
中科院分区：
文献类型：
--
作者：
Namburete, Ana I. L.;Rana, Manku;Wakeling, James M.
肌肉束在收缩过程中弯曲，这已经用B型超声观察到。曲率可以沿肌束沿着变化，并且在肌肉内的肌束之间变化。本研究的目的是开发一种自动化方法，用于量化整个成像肌肉的曲率，测试该方法对已知曲率和噪声的合成图像的准确性，并测试该方法对超声探头放置的灵敏度。使用多尺度血管增强滤波处理合成图像和超声图像以突出肌肉束，使用基于小波的方法来量化束方向，并通过量化图像内每个点的局部曲率来产生曲率分布网格。在一项重测研究中获得了人内侧腓肠肌等长收缩的超声图像，该方法能够确定肌肉不同区域的不同曲率。这些方法对图像处理过程中的核大小、图像内的噪声和重新测试过程中探针位置的变化敏感。在曲率和噪声的生理范围内，从验证网格计算的曲率被量化，典型标准误差小于0.026 m（-1），这大约是收缩肌束中观察到的最大曲率的1%。Crown版权所有（C）2011由Elsevier Ltd.发布。保留所有权利。
Muscle fascicles curve during contraction, and this has been seen using B-mode ultrasound. Curvature can vary along a fascicle, and amongst the fascicles within a muscle. The purpose of this study was to develop an automated method for quantifying curvature across the entirety of an imaged muscle, to test the accuracy of the method against synthetic images of known curvature and noise, and to test the sensitivity of the method to ultrasound probe placement. Both synthetic and ultrasound images were processed using multiscale vessel enhancement filtering to accentuate the muscle fascicles, wavelet-based methods were used to quantify fascicle orientations and curvature distribution grids were produced by quantifying local curvatures for each point within the image. Ultrasound images of ramped isometric contractions of the human medial gastrocnemius were acquired in a test-retest study.The methods enabled distinct curvatures to be determined in different regions of the muscle. The methods were sensitive to kernel sizes during image processing, noise within the image and the variability of probe placements during retesting. Across the physiological range of curvatures and noise, curvatures calculated from validation grids were quantified with a typical standard error of less than 0.026 m(-1), and this is about 1% of the maximum curvatures observed in fascicles of contracting muscle. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.