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相关概念视频

Curvilinear Motion: Rectangular Components01:23

Curvilinear Motion: Rectangular Components

462
Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
As the car advances, its position evolves over time. Quantifying the car's velocity involves computing the...
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Acceleration Vectors01:30

Acceleration Vectors

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In everyday conversation, accelerating means speeding up. Acceleration is a vector in the same direction as the change in velocity, Δv, therefore the greater the acceleration, the greater the change in velocity over a given time. Since velocity is a vector, it can change in magnitude, direction, or both. Thus acceleration is a change in speed or direction, or both. For example, if a runner traveling at 10 km/h due east slows to a stop, reverses direction, and continues their run at 10 km/h...
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Deconvolution01:20

Deconvolution

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Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
162
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

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Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
92
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

207
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
207
Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

370
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...
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相关实验视频

Updated: Jul 10, 2025

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

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加快螺旋模糊除色,使用方形核和低通预先调节.

Dinghui Wang1, Tzu Cheng Chao1, James G Pipe1

  • 1Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA.

Magnetic resonance in medicine
|November 27, 2023
PubMed
概括

新的方形内核显著改善了螺旋成像,通过减少文物和计算成本来消除模糊. 这些内核可以提高图像质量和信号噪声比 (SNR),从而实现更好的医学成像.

科学领域:

  • 医疗成像医学成像
  • 图像处理 图像处理

背景情况:

  • 螺旋成像对于强大的MRI采集至关重要.
  • 需要有效的消除模糊的方法来提高图像质量.
  • 以前的方法使用图像空间内核操作来同时分离水和脂肪并消除模糊.

研究的目的:

  • 为了提高先前消除模糊的技术的性能.
  • 为了研究具有改善螺旋成像模糊化特性的新型核.

主要方法:

  • 使用不同的模型和低通前置 (LP) 开发了四种内核类型.
  • 使用幻影和志愿者数据评估内核性能.
  • 综合数据以评估信号与噪声比率 (SNR).

主要成果:

  • 拟议的方形内核更紧,性能优于圆形内核.
  • 平方内核显示出优越的正常化RMS误差,结构相似度指数和SNR.
  • LP生成的方形内核在幻影数据中显示了最佳的工件缓解.

结论:

  • 与圆形内核相比,方形内核可以减少模糊内核大小和计算成本.
  • 低通预制 (LP) 可以进一步提高消除模糊性能的性能.
关键词:
删除模糊的方法异共振校正 异共振校正螺旋螺旋的螺旋是什么水-脂肪成像成像技术

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  • 开发的内核为螺旋成像模糊消除提供了更有效和有效的方法.