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相关概念视频

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Interference and Superposition of Waves01:07

Interference and Superposition of Waves

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
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Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Doppler Effect - II01:05

Doppler Effect - II

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Doppler Effect - I00:56

Doppler Effect - I

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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相关实验视频

Updated: Feb 28, 2026

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

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基于虚拟源的apodization用于分歧波成像:一个实验研究.

Zahraa Alzein1, Hervé Liebgott2, Marco Crocco3

  • 1University of Genoa, Italy.

Ultrasonic imaging
|February 26, 2026
PubMed
概括
此摘要是机器生成的。

这项研究引入了用于分离波成像 (DWI) 的复合面具,一种超快超声波. 该方法优化了传输apodization重量,提高了B模式图像质量,而不会牺牲医疗诊断中的实时性能.

关键词:
波浪的分歧是不同的.合成光圈成像技术 合成光圈成像传输传输的 apodization 的时间.虚拟资源是虚拟的来源.

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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相关实验视频

Last Updated: Feb 28, 2026

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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Three-dimensional Optical-resolution Photoacoustic Microscopy
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科学领域:

  • 医疗成像医学成像
  • 超声波技术 超声波技术 超声波技术
  • 信号处理 信号处理

背景情况:

  • 超快速成像技术,包括分离波成像 (DWI),使得高率用于先进的医学诊断,如多普勒成像和剪切波弹性成像.
  • 在超快速成像中,由于连贯复合过程中合成光束的形成,传统的传输apodization是不可行的.
  • 优化DWI的传输apodization重量,与平面波成像 (PWI) 不同,仍然是一个未经探索的领域.

研究的目的:

  • 介绍以前开发的封闭形式方法的实时实现,用于将合成孔径成像 (SAI) 的apodization重量映射到DWI的复合面罩上.
  • 为了验证这种复合面具方法在各种虚拟源 (VS) 配置和超声波阵列几何结构中的有效性.

主要方法:

  • 一种封闭形式的方法被适用于将SAI的apodization重量映射到DWI的复合阶段重量,称为复合面具.
  • 复合面具方法在Verasonics超声波扫描仪上实时实现.
  • 验证是使用线性,曲线性和倾斜的虚拟源分布与线性和形数组进行的.

主要成果:

  • 实时实现成功地将复合面具应用于所有测试的虚拟源配置.
  • 实验结果显示,线性和形数组的B模式图像质量显著改善.
  • 复合面具方法并没有影响超快速成像系统的实时性能.

结论:

  • 复合面具方法提供了一种有效的手段,以优化在分离波成像中传输apodization.
  • 这种技术可以在超快超声波诊断中提高图像质量,而不会降低性能.
  • 这种方法是多功能性的,适用于各种虚拟源安排和数组类型.