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相关概念视频

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

400
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...
400
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

354
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...
354
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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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...
459
Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

52
The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
52
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

219
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...
219
One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation

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This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
On...
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相关实验视频

Updated: Jun 24, 2025

Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro
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计算intravoxel不连贯的运动参数图,使用核心化基于总差异的方法.

Hsuan-Ming Huang1,2

  • 1Institute of Medical Device and Imaging, College of Medicine, National Taiwan University, Taipei City, Taiwan.

NMR in biomedicine
|June 12, 2024
PubMed
概括
此摘要是机器生成的。

一种新的核心化总差异方法改善了在扩散权重MRI中的Intravoxel不连贯运动 (IVIM) 参数映射. 这种技术提高了可靠性,并保留了细节,在模拟和实验中表现优于现有的方法.

关键词:
扩散权重磁共振成像技术的扩散权重磁共振成像在intravoxel不连贯的运动.核子中的核子.总差额的总差额.

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科学领域:

  • 医疗成像医学成像
  • 量化MRI是指数量化的MRI.
  • 生物物理建模 生物物理建模

背景情况:

  • 扩散权重磁共振成像 (DW-MRI) 可用于临床应用的定量分析.
  • 在DW-MRI中,Intravoxel不连贯运动 (IVIM) 模型被广泛使用,但参数图通常会受到噪音诱导的不可靠性影响.
  • 现有的像素智能安装方法与噪声作斗争,影响IVIM参数估计的准确性.

研究的目的:

  • 提出和评估一种基于总差异的新型核心化曲线拟合方法,以进行可靠的IVIM参数估计.
  • 将拟议的方法与既有技术进行比较,例如信任区域反射 (TRR),贝叶斯概率 (BP) 和深度神经网络 (DNN).
  • 通过模拟和真实腹部DW-MRI数据在各种信号噪声比和b值上评估方法的性能.

主要方法:

  • 为IVIM参数估计开发基于总差异的核心化曲线拟合算法.
  • 使用模拟的DW-MRI数据在多个信号与噪声比率 (10-100) 的验证.
  • 在1.5T时获得的真实腹部DW-MRI数据的评估,具有9个b值 (0-500s/mm2) 和6个梯度方向.

主要成果:

  • 拟议的方法在模拟中表现出卓越的性能,与TRR,BP和DNN相比,实现更低的平方根平均误差.
  • 它有效地保留了估计的IVIM参数图中的细节.
  • 实验结果显示,与TRR相比,伪扩散系数的过高估计减少,IVIM地图质量改善,性能与BP和DNN相比,但精度更高.

结论:

  • 核心化基于总差异的曲线拟合方法为IVIM参数成像的可靠性提供了显著的改进.
  • 它为腹部器官提供了更精确的IVIM参数估计,接近参考值.
  • 这种技术有可能通过提供更准确和详细的IVIM地图来提高DW-MRI的诊断价值.