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相关概念视频

Spherical Coordinates01:23

Spherical Coordinates

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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...
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Stokes' Law01:20

Stokes' Law

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Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only...
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Gauss's Law: Cylindrical Symmetry01:20

Gauss's Law: Cylindrical Symmetry

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A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
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Gauss's Law: Spherical Symmetry01:26

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A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half has a...
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X-ray Imaging01:24

X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Gravitation Between Spherically Symmetric Masses01:14

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The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.
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相关实验视频

Updated: Jan 6, 2026

Determining 3D Flow Fields via Multi-camera Light Field Imaging
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可变密度和异构的视野为3D星星堆的辐射成像.

Joao Tourais1,2,3, Guruprasad Krishnamoorthy1,2, Jouke Smink2

  • 1Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.

Magma (New York, N.Y.)
|October 15, 2025
PubMed
概括

在射线成像中,用于圆视野 (FOV) 的新非代方法,特别是用于Stack-Of-Stars (SOS) MRI,在保持图像质量的同时,显著减少了高达45%的扫描时间. 这种方法还可以最大限度地减少伪造文物,提高诊断准确度.

关键词:
不同类型的FOV.圆形是指圆形的辐射成像技术 辐射成像技术一堆星星的星星可变密度的变量密度.

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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
  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 图像重建 图像的重建

背景情况:

  • 像Stack-Of-Stars (SOS) 这样的辐射成像技术对于加速MRI采集至关重要.
  • 在射线成像中,优化视野 (FOV) 和数据采样对于减少扫描时间和减轻工件至关重要.
  • 目前在辐射成像中应用非圆形FOV的方法可能是复杂的和代的.

研究的目的:

  • 开发和评估一种新的非代方法,用于在辐射MRI中实现圆视野 (FOV).
  • 评估这个圆FOV方法在k_z方向变量辐射密度的星星堆 (SOS) 成像中的有效性.
  • 调查异型FOV和可变密度采样对缩短扫描时间和别名化文物的影响.

主要方法:

  • 衍生出新的分析表达式来计算圆FOV的辐射轮角度,有或没有金角采样.
  • 评估了一个圆FOV,主要与小轴比为1:0.5,与可变密度SOS一起.
  • 利用点传播功能分析,幻影成像和体内盆腔成像进行全面评估.

主要成果:

  • 在k_z方向的变量密度减少了SOS扫描时间20%与可比的别名化工件.
  • 无异型FOV减少了对象的扫描时间31%与匹配的无异型,显示在低低样本时类似的别名.
  • 结合这两种技术,可以减少45%的扫描时间.
  • 当扫描时间与传统的SOS相同时,可变密度和异性质FOV都显示出减少的别名化工件.

结论:

  • 可变密度和异型FOV是减少扫描时间和/或在SOS成像中别名化文物的有效策略.
  • 为圆FOV开发的分析表达式将使进一步研究异型FOV辐射成像技术成为可能.
  • 这种非代的方法为加速辐射MRI采集提供了实际的进步.