Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5735
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Title: Dynamic measurement of pennation angle of gastrocnemius muscles during contractions based on ultrasound imaging
Authors: Zhou, Y
Li, JZ
Zhou, G
Zheng, YP 
Issue Date: 3-Sep-2012
Source: BioMedical engineering online 2012, 11:63
Abstract: Background: 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).
Methods: 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.
Results: 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.
Conclusions: With the proposed methods, ultrasound measurement for muscle pennation angles can be more widely used for functional assessment of muscles.
Keywords: Ultrasound image
Pennation angle
Hough transform
Sonomyography
SMG
Electromyography
EMG
Gastrocnemius muscle
Orientation
Publisher: BioMed Central Ltd.
Journal: BioMedical Engineering OnLine 
ISSN: 1475-925X
DOI: 10.1186/1475-925X-11-63
Rights: © 2012 Zhou et al.; licensee BioMed Central Ltd.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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