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相关概念视频

Reclosers and Fuses01:26

Reclosers and Fuses

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Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
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Subliminal Perception01:15

Subliminal Perception

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Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
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Passive Filters01:27

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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相关实验视频

Updated: Jan 29, 2026

Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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融合预测和感知:适应卡尔曼波器驱动的呼吸门为MR外科导航.

Haoliang Li1, Shuyi Wang1, Jingyi Hu1

  • 1School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

Sensors (Basel, Switzerland)
|January 28, 2026
PubMed
概括

这项研究引入了一种混合现实外科导航系统,以减少穿刺时的呼吸运动错误. 该系统通过预测呼吸模式来提高准确度,以提供精确的针插入指导.

关键词:
适应式卡尔曼波器 适应式卡尔曼波器混合现实混合现实.呼吸道门封闭的情况呼吸运动补偿 呼吸运动补偿

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科学领域:

  • 医疗成像医学成像
  • 手术导航 手术导航
  • 增强现实是一种增强现实.

背景情况:

  • 呼吸运动在胸腔腹腔穿皮穿刺时会导致显著的目标位移.
  • 目前的增强现实 (AR) 引导程序面临系统延迟,依赖手术内成像和缺乏智能定时的挑战.
  • 准确和安全的穿皮穿刺受到不可预测的呼吸运动的阻碍.

研究的目的:

  • 开发和评估混合现实 (MR) 手术导航系统,以补偿呼吸引起的目标位移.
  • 为皮肤穿刺手术提供智能定时辅助.
  • 为了提高AR导向胸腔腹腔干预的准确性和安全性.

主要方法:

  • 开发了一个MR外科导航系统,集成了一个基于卡尔曼波器的适应性呼吸预测模块和视觉门线索.
  • 使用动态呼吸运动模拟平台对系统进行了评估.
  • 利用光学追踪呼吸运动的实时状态估计和短期预测,用于补偿和指导窗口预测.

主要成果:

  • 与未补偿条件相比,动态注册误差从3.15 ± 1.23 mm减少到2.11 ± 0.58 mm (p < 0.001).与未补偿条件相比,动态注册误差从3.15 ± 1.23 mm减少到2.11 ± 0.58 mm (p < 0.001).
  • 在预测指导的最后吸入窗口时,达到>92%的准确性,提前大约发生142 ms.
  • 证明有效地抑制由呼吸运动引起的MR模型漂移.

结论:

  • 集成的MR系统成功地减轻了在外科导航中的呼吸引起的模型漂移.
  • 有效地提供了穿孔执行的智能定时指导,提高了程序精度.
  • 开发的系统提供了一个有前途的解决方案,以提高AR引导的皮肤穿刺手术的准确性和安全性.