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相关概念视频

Conservation of Mass in Moving, Nondeforming Control Volume01:14

Conservation of Mass in Moving, Nondeforming Control Volume

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Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
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Conservation of Mass in Fixed, Nondeforming Control Volume01:07

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The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
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Elastic Collisions: Introduction01:00

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An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
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Elastic Collisions: Case Study01:15

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Uniform Depth Channel Flow: Problem Solving01:18

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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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The vertical distance between the actual value of y and the estimated value of y. In other words, it measures the vertical distance between the actual data point and the predicted point on the line
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Measurement of the Compressibility of Cell and Nucleus Based on Acoustofluidic Microdevice
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一个凸起式可压缩性启发的未经监督的人失去了物理驱动的深度学习重建的功能.

Yaşar Utku Alçalar1,2, Merve Gülle1,2, Mehmet Akçakaya1,2

  • 1Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota, USA.

Proceedings. IEEE International Symposium on Biomedical Imaging
|January 31, 2025
PubMed
概括
此摘要是机器生成的。

物理驱动的深度学习 (PD-DL) 改善了快速MRI扫描. 一个新凸损失函数提高了监督,无监督和零射击设置中的重建质量,优于传统方法.

关键词:
图像重建 图像重建压缩感应传感器 压缩感应深度学习是一种深度学习.快速的核磁共振成像 (MRI).神经网络的神经网络的神经网络监督学习学习监督学习没有监督的学习学习.零射击学习的学习

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科学领域:

  • 医疗成像医学成像
  • 机器学习 机器学习
  • 图像重建 图像的重建

背景情况:

  • 物理驱动的深度学习 (PD-DL) 越来越多地用于快速MRI重建.
  • 早期的PD-DL方法主要采用监督学习.
  • 最近的兴趣集中在PD-DL培训的无监督学习上.

研究的目的:

  • 为PD-DL训练提出一种新的凸损失函数.
  • 在监督,无监督和零射击场景中评估重建质量.
  • 提供一种由压缩传感灵感的替代学习策略.

主要方法:

  • 开发了一个凸损失函数来评估图像压缩性和数据保真性.
  • 使用重新加权的L1规范作为L0规范的近似值.
  • 将损失函数应用于PD-DL网络进行MRI重建.

主要成果:

  • 用拟议的损失训练的PD-DL网络表现优于传统方法.
  • 重建质量与现有的监督和无监督PD-DL技术相美.
  • 新的损失函数在不同的训练环境中展示了多功能性.

结论:

  • 拟议的凸损失函数是PD-DL训练的有效替代方案.
  • 这种方法提高了MRI重建的质量和通用性.
  • 它为加速MRI采集的未来研究提供了一个有希望的方向.