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相关概念视频

Vector Transformation in Rotating Coordinate Systems01:16

Vector Transformation in Rotating Coordinate Systems

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Consider a vector rotating about an axis with an angular velocity, such that its tip sweeps a circular path.
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Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
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Transformation01:26

Transformation

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Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
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Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

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In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
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Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
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Forced Transdifferentiation01:28

Forced Transdifferentiation

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Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
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对于2D/3D注册和投射空间变压器的完全可区分的框架.

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    此摘要是机器生成的。

    这项研究引入了一个深度学习框架,使用了一个新的投射空间变压器 (ProST) 模块来提高2D/3D图像注册精度和手术指导的捕获范围. ProST网络显著增强了传统方法,在现实应用中实现了更高的成功率.

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    科学领域:

    • 医疗成像医学成像
    • 计算机视觉 计算机视觉
    • 深度学习 (Deep Learning) 是一种深度学习.

    背景情况:

    • 2D/3D图像注册对于图像引导手术至关重要.
    • 由于相似性函数中的局部最小值,传统方法的捕获范围有限.

    研究的目的:

    • 使用可差分的深度网络扩展2D/3D注册的捕获范围.
    • 开发一个新的投射空间变压器 (ProST) 模块,以改进姿势估计.

    主要方法:

    • 开发了一个完全可差异化的深度网络框架.
    • 该网络包含一个投射空间变压器 (ProST) 模块,具有独特的3D姿势参数可区分能力.
    • 训练使用了双反向梯度驱动的损失函数.

    主要成果:

    • ProST网络学习了一个实用的相似性函数,显著扩大了注册捕获范围.
    • 对于骨盆解剖学,ProST跟随CMAES在模拟中实现了4.4mm (65.6%SR) 的中位数TRE,在真实数据中达到2.2mm (73.2%SR).
    • 这比单独CMAES (28.5%和36.0%SRs) 显著改善.

    结论:

    • 拟议的ProST网络有效地提高了基于强度的2D/3D注册的捕获范围.
    • ProST的独特可区分性显示了在3D医学成像研究中更广泛应用的潜力.