Results 181 to 190 of about 6,879 (202)
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Estimation of muscle pennation angle in ultrasound images using the beamlet transform
Journal of Shanghai University (English Edition), 2010Ultrasound imaging has been widely used to investigate the architecture properties of skeletal muscle, including the measurement of the pennation angle. In this study, we propose a beamlet-based algorithm to detect the straight line-shaped patterns of aponeurosis, fascicle or bone, and then to quantify the pennation angle in ultrasound images.
Jun Shi, Rui-ling Wang
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Pennation angles of ankle dorsiflexor and plantarflexors depending on muscle contraction intensity
International Journal of Precision Engineering and Manufacturing, 2013In this study, we investigated the pennation angles of ankle muscles as they relate to muscle contraction intensity (MCI). Eight male subjects with no history of musculoskeletal injuries participated. In each patient, the ankle joint was fixed at 15° dorsiflexion and 0°, 15° and 30° plantarflexion.
Seunghyeon Kim +4 more
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Ultrasound in Medicine & Biology, 2015
The reflection of an ultrasound (US) wave is strongest when the propagation direction of the wave is perpendicular to muscle fascicles. Thus, it is possible that muscle echo intensity (EI), a gray-scale US measure of muscle quality, may be influenced by the angulation of muscle fascicles.
Eric D, Ryan +5 more
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The reflection of an ultrasound (US) wave is strongest when the propagation direction of the wave is perpendicular to muscle fascicles. Thus, it is possible that muscle echo intensity (EI), a gray-scale US measure of muscle quality, may be influenced by the angulation of muscle fascicles.
Eric D, Ryan +5 more
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Journal of Shoulder and Elbow Surgery, 2011
It is hypothesized that supraspinatus central tendon retraction is related to functional deficit; yet, there is no literature comparing the normal and pathological pennation and central tendon angles using magnetic resonance imaging (MRI). Therefore, the aim of this study was to quantify the anterior and posterior muscle pennation angles, central ...
Simon M, Thompson +3 more
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It is hypothesized that supraspinatus central tendon retraction is related to functional deficit; yet, there is no literature comparing the normal and pathological pennation and central tendon angles using magnetic resonance imaging (MRI). Therefore, the aim of this study was to quantify the anterior and posterior muscle pennation angles, central ...
Simon M, Thompson +3 more
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Fatigue-Induced Continuous Changes in Muscle Pennation Angle during Isometric Contraction
2010 4th International Conference on Bioinformatics and Biomedical Engineering, 2010Muscle fatigue is an exercise-induced reduction in the maximal capacity of muscle to produce force or power output. The continuous changes of brachialis pennation angles during the fatiguing isometric contraction was investigated in this study. The muscle torque, surface electromyography (SEMG) and ultrasound image of brachialis were continuously ...
Jun Shi +3 more
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Change in Gastrocnemius Pennation Angle According to Ankle Dorsiflexion among University Students
Journal of the Korea Academia-Industrial Cooperation Society, 2015 본 연구의 목적은 발목관절의 발등굽힘 각도를 $0^{\circ}$ , $10^{\circ}$ , $20^{\circ}$ 로 위치하게 한 후 각 각도에서 장딴지근의 깃각 변화에 미치는 영향을 비교하여 효율적인 장딴지근 신장 각도를 제시하는 것이다. 건강한 성인 남녀 25명을 그 대상으로 하여 발목관절 발등굽힘 각도 $0^{\circ}$ , $10^{\circ}$ , $20^{\circ}$ 에서 초음파 기기를 이용하여 내측 장딴지근의 깃각을 측정하였다. 각도별 장딴지근의 깃각 변화를 알아보기 위해 반복측정분산분석을 성별에 따른 각도별 차이를 알아보기 위해 독립 t 검정을 실시하였다.
Ji-Seon Kim +4 more
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THE RELATIONSHIP OF PENNATION ANGLE TO THE INDEX OF ARCHITECTURE IN MUSCLE461
Medicine & Science in Sports & Exercise, 1996L. Li, G. E. Caldwell
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Nan fang yi ke da xue xue bao = Journal of Southern Medical University, 2015
We propose a cross-correlation method for automatic extraction of the pennation angle (PA) of the gastrocnemius (GM) muscle from ultrasound radiofrequency (RF) signals.The ultrasound RF signals of the GM muscles in tension condition from normal subjects and the simulated ultrasound signals were collected.
Qingya, Pan +5 more
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We propose a cross-correlation method for automatic extraction of the pennation angle (PA) of the gastrocnemius (GM) muscle from ultrasound radiofrequency (RF) signals.The ultrasound RF signals of the GM muscles in tension condition from normal subjects and the simulated ultrasound signals were collected.
Qingya, Pan +5 more
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