相关实验视频
Updated: Jul 13, 2026
10:53
A Novel Application of Musculoskeletal Ultrasound Imaging
Published on: September 17, 2013
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对于神经肌肉骨模型的实时校准免费肌肉动力学
概括
一个新的神经网络准确地实时估计了肌肉骨动力学,改善了用于康复和疾病管理等应用的生物力学模型,而不需要单独的替代模型.
科学领域:
- 生物力学 生物力学
- 计算建模计算建模
- 机器学习 机器学习
背景情况:
- 神经肌肉骨 (NMS) 模型以非侵入的方式估计内部生物力学.
- 精确估计肌动力学 (长度,动力臂,动作线) 对于NMS模型至关重要.
- 当前的实时计算需要计算密集,每个人替代模型.
研究的目的:
- 开发一个前神经网络,以实时估计肌运动.
- 为了实现跨多种类型的人类测量范围的准确和计算效率高的NMS建模.
- 为了促进在现实世界应用中部署NMS模型.
主要方法:
- 开发了一个前神经网络来编码肌运动学.
- 通过对长度,时刻臂和动作线的参考数据验证神经网络.
- 将神经网络集成到电肌图信息NMS模型中,以计算部接触力.
主要成果:
- 神经网络实现了高精度:长度误差为~0.1%,时刻臂误差为<0.4%,动作线误差为<0.10°.
- 使用神经网络的NMS模型显示,与参考模型相比,部接触力 (1.23±0.15%RMSE) 的差异很小.
- 执行时间始终很快 (<0.04ms/frame),无论模型的复杂性如何.
结论:
- 开发出来的神经网络提供了准确的实时肌动力学.
- 这种方法消除了对每个人代孕模型的需求,提高了计算效率.
- 能够为计算机视觉,可穿戴设备,生物力学监测,康复和疾病管理中的应用提供先进的实时NMS建模.
相关概念视频
01:26Kinematic Equations - I
When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
01:17Kinematic Equations - II
The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
01:18Kinematic Equations - III
The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
Using the kinematic equations,...
01:12Gross Anatomy of Skeletal Muscles
The connective tissues play a significant role in arranging the muscle fibers into a hierarchical structure that forms a complete muscle. Consider a muscle like the bicep brachii, commonly called the bicep. This muscle comprises thousands of muscle fibers enclosed by a protective layer of connective tissue called the endomysium. The endomysium is primarily composed of reticular fibers, a type of thin collagen fiber. It allows the exchange of nutrients and waste products at the fiber level,...
01:29Relaxation of Skeletal Muscles
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
01:30Kinematic Equations for Rotation
In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...