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相关概念视频

Spherical Coordinates01:23

Spherical Coordinates

Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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 instrumental in...
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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...
Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position with respect to time...

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相关实验视频

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MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
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使用球形导航器对和易感性映射进行前性运动校正.

Miriam Hewlett1,2, Omer Oran3, Junmin Liu1

  • 1Robarts Research Institute, The University of Western Ontario, London, Ontario, Canada.

Magnetic resonance in medicine
|December 4, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种基于导航器的新方法,用于前运动校正 (PMC) 和场移校正,显著提高了脑部MRI定量绘图的准确性.

关键词:
大脑大脑大脑的大脑大脑航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员,航海员预期的运动校正正.易感性映射绘制的敏感性映射

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相关实验视频

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 医学物理 医学物理
  • 神经成像是一种神经成像.

背景情况:

  • 运动文物是定量MRI的一个主要挑战,降低图像质量和地图准确性.
  • 准确的和易感性映射对于各种神经学应用至关重要.

研究的目的:

  • 开发和评估一种纯粹基于导航器的方法来进行前运动校正 (PMC).
  • 在MRI采集过程中同时纠正运动和零级场变化.

主要方法:

  • 球形导航器 (SNAVs) 与FID读数 (FIDSNAVs) 结合,用于同时测量运动和场移.
  • FIDSNAVs与PMC的多回声梯度回声序相交,并进行了回顾性校正.
  • 实验是在3T扫描仪上进行的,具有32通道头线圈,并用真实运动数据在志愿者身上进行测试.

主要成果:

  • PMC有效地减少了文物,特别是在更短的回声时间.
  • 回顾性校正对于在更长的回声时间下减少文物至关重要.
  • 无论是PMC还是回顾性校正,都提高了和易感性图的准确性,在严重的运动病例中还存在残留文物.

结论:

  • 在FIDSNAV的方法允许同时运动和场的校正,没有额外的硬件.
  • 这种方法提高了定量核磁共振绘图在存在主体运动时的准确性.
  • 这种技术有望提高神经成像诊断的准确性.