Dynamic measurement of pennation angle of gastrocnemius muscles during contractions based on ultrasound imaging.
Dynamic measurement of pennation angle of gastrocnemius muscles during contractions based on ultrasound imaging.
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DOI：
10.1186/1475-925x-11-63
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发表时间：
2012-09-03
影响因子：
3.9
通讯作者：
Zheng YP
中科院分区：
文献类型：
--
作者：
Zhou Y;Li JZ;Zhou G;Zheng YP
肌束羽状角（PA）是与肌肉骨骼功能相关的重要参数，超声成像已被广泛用于测量PA，但大多数情况下是手动和逐帧测量。我们先前已经报道了一种基于Gabor变换和Revoting Hough变换（RVHT）的自动方法来估计腱膜方向。本文提出了一种估计感兴趣区域中肌束整体方向的方法，以完成对羽状角另一侧的方向计算，而不是RVHT找到的那一侧。在每帧超声图像上测量肌束和腱膜的方向，自动获得肌肉收缩过程中羽状角的动态变化。使用具有不同噪声水平的合成图像和之后的500幅等长跖屈期间人腓肠肌的超声图像来评估用于束定向估计的方法。肌束方向也由两名操作员手动估计。从结果中可以发现，所提出的自动方法表现出与手动方法相当的性能。利用所提出的方法，超声测量肌肉的羽角可以更广泛地用于肌肉的功能评估。
Muscle fascicle pennation angle (PA) is an important parameter related to musculoskeletal functions, and ultrasound imaging has been widely used for measuring PA, but manually and frame by frame in most cases. We have earlier reported an automatic method to estimate aponeurosis orientation based on Gabor transform and Revoting Hough Transform (RVHT). In this paper, we proposed a method to estimate the overall orientation of muscle fascicles in a region of interest, in order to complete computing the orientation of the other side of the pennation angle, but the side found by RVHT. The measurements for orientations of both fascicles and aponeurosis were conducted in each frame of ultrasound images, and then the dynamic change of pennation angle during muscle contraction was obtained automatically. The method for fascicle orientation estimation was evaluated using synthetic images with different noise levels and later on 500 ultrasound images of human gastrocnemius muscles during isometric plantarflexion. The muscle fascicle orientations were also estimated manually by two operators. From the results it’s found that the proposed automatic method demonstrated a comparable performance to the manual method. With the proposed methods, ultrasound measurement for muscle pennation angles can be more widely used for functional assessment of muscles.