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相关概念视频

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

879
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
879
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

702
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
702
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

753
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
753
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

536
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
536
Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

814
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
814
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

691
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
691

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相关实验视频

Updated: Jan 15, 2026

Movement Retraining using Real-time Feedback of Performance
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对于MPnRAGE的自导航,回顾性,数据一致的运动校正.

John Podczerwinski1, Andrew L Alexander1,2,3, Brittany G Travers1,4

  • 1Waisman Center, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Magnetic resonance in medicine
|October 13, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了用于3D辐射T1加权成像的自动化运动校正方法,显著提高了图像质量和皮质厚度测量的测试-检测可靠性,特别是在儿科患者中. 先进的技术提高了数据的一致性,以提高诊断准确度.

关键词:
在MPnRAGE中使用MPnRAGE在T1加权的T1加权.在k-空间.运动校正,运动校正.辐射式 辐射式

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相关实验视频

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科学领域:

  • 医疗成像医学成像
  • 神经成像是一种神经成像.
  • 生物医学工程 生物医学工程

背景情况:

  • 运动文物是3D辐射T1加权MRI的一个重大挑战,可能会损害图像质量和诊断准确性.
  • 现有的运动校正方法可能缺乏自动化或难以处理各种运动类型和严重程度.

研究的目的:

  • 扩展和自动化一个数据一致的,自导航的运动校正方法,用于3D辐射T1加权成像.
  • 评估该方法在各种运动场景中的有效性及其对神经成像测量测试可靠性的影响.

主要方法:

  • 将刚体运动纳入前向模型,解决运动参数以最大限度地提高数据的一致性.
  • 在各种数据集上测试了自动化方法,评估图像质量改进和对皮质厚度可靠性的影响.
  • 利用基于错误的权重和精细尺度的定时分辨率来增强运动校正.

主要成果:

  • 在广泛的运动类型中实现了显著的图像质量改进,挽救了以前无法使用的扫描.
  • 对于儿科患者皮质厚度测量测试重复测试可靠性的显著提升.
  • 通过校正方法将皮质厚度的平均变化系数从2.73%降至0.79%.

结论:

  • 自动化运动校正方法对于T1加权的辐射数据是有效的,提供了定性和定量上的好处.
  • 该技术的精细尺度定时分辨率和基于错误的加权对于容易运动的人群或需要对小效果尺寸高度敏感的研究尤其有利.