School of Technology and Health, Royal Institute of Technology (KTH), Huddinge, Sweden.
Ultrasound Med Biol. 2011 Jul;37(7):1151-60. doi: 10.1016/j.ultrasmedbio.2011.04.006. Epub 2011 Jun 2.
Tissue velocity imaging (TVI) is a Doppler based ultrasound technique that can be used to study regional deformation in skeletal muscle tissue. The aim of this study was to develop a biomechanical model to describe the TVI strain's dependency on the pennation angle. We demonstrate its impact as the subsequent strain measurement error using dynamic elbow contractions from the medial and the lateral part of biceps brachii at two different loadings; 5% and 25% of maximum voluntary contraction (MVC). The estimated pennation angles were on average about 4° in extended position and increased to a maximal of 13° in flexed elbow position. The corresponding relative angular error spread from around 7% up to around 40%. To accurately apply TVI on skeletal muscles, the error due to angle changes should be compensated for. As a suggestion, this could be done according to the presented model.
组织速度成像（TVI）是一种基于多普勒的超声技术，可用于研究骨骼肌组织的局部变形。本研究的目的是开发一个生物力学模型来描述 TVI 应变对羽状角的依赖性。我们使用肱二头肌内侧和外侧在两种不同负荷下（5%和 25%的最大自主收缩（MVC））进行的动态肘部收缩，展示了其作为后续应变测量误差的影响。估计的羽状角在伸展位置平均约为 4°，在弯曲肘部位置增加到最大 13°。相应的相对角度误差从约 7%扩展到约 40%。为了准确地将 TVI 应用于骨骼肌，应补偿因角度变化引起的误差。作为一个建议，可以根据提出的模型进行补偿。
