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Orthogonal Trajectories01:26

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Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
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Traveling Waves: Lossless Lines01:27

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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
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Effective Value of a Periodic Waveform01:07

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对于任意$k$-空间轨迹的实时梯度波形设计.

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    此摘要是机器生成的。

    这项研究引入了一种新的实时方法,用于设计磁共振成像中的梯度波形,显著减少任意k空间轨迹的计算时间和失误率.

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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
    • 信号处理 信号处理

    背景情况:

    • 为任意的k空间轨迹设计梯度波形对于先进的MRI技术至关重要.
    • 现有的方法在实时适用性和硬件合规性方面往往面临局限性.

    研究的目的:

    • 开发一种实时,硬件兼容的方法来设计时间最佳的梯度波形.
    • 为了适应MRI梯度波形设计中的任意k空间轨迹.

    主要方法:

    • 一种递归方法在旋转率和轨迹约束下解决梯度波形,形成二次方程.
    • 梯度约束是使用L2-规范值和逃逸速度来强制执行的.
    • 离散时间前向和后向扫描策略完善了杀伤率约束.
    • 轨迹和梯度重定位增强了一般性和采样准确性.

    主要成果:

    • 实现了超过89%的计算时间减少和超过98%的流量率错误减少.
    • 计算时间始终比梯度持续时间短,证实实时能力.
    • 通过幻影和体内实验证明成像的可行性.

    结论:

    • 开发的方法可以实现实时,硬件兼容的梯度波形设计.
    • 与以前的方法相比,观察到计算时间和死亡率超越的显著减少.
    • 这代表了对任意k空间轨迹的实时梯度波形设计的第一个方法.