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相关概念视频

Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
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Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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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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Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
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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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相关实验视频

Updated: Sep 11, 2025

Blood Flow Imaging with Ultrafast Doppler
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Blood Flow Imaging with Ultrafast Doppler

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脉冲逆转多普勒式相位补偿 减少高率对比增强超声波的失调.

Hsin Huang1, Yichuang Han2, Hendrik J Vos3

  • 1Thorax Biomedical Engineering, Department of Cardiology, Erasmus MC University Medical Center, Rotterdam, the Netherlands; Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.

Ultrasound in medicine & biology
|August 17, 2025
PubMed
概括

本研究介绍了用于高率对比增强超声波的相位补偿算法. 该方法减少了快速血流中的信号损失,改善了速度测量,以更好地估计流量.

关键词:
血液流动成像 血液流动成像与对比度增强的超声波.这是什么关系?这就是EchoPIV.高率成像技术的成像阶段性补偿阶段性补偿脉冲逆转多普勒是指一个脉冲逆转多普勒.

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A Novel Application of Musculoskeletal Ultrasound Imaging
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相关实验视频

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科学领域:

  • 医疗成像医学成像
  • 生物医学工程 生物医学工程
  • 流体动力学 流体动力学

背景情况:

  • 使用对比剂的高率 (HFR) 超声波可以通过回声粒子图像速度计 (echoPIV) 进行血流研究.
  • 脉冲逆转用于增强超声波对比剂 (UCA) 信号,但由于UCA的位移,可以在快速流动中遭受信号损失.
  • 这种信号损失阻碍了echoPIV准确的血液流量跟踪.

研究的目的:

  • 开发和评估HFR对比增强超声波中脉冲逆转多普勒 (PID) 的相位补偿算法.
  • 为了减轻由快速移动的UCAs引起的超声图像中的运动诱导的信号损失.
  • 为了提高血液流速测量的准确性,使用echoPIV.

主要方法:

  • 为PID成像开发了一种新的相位补偿算法.
  • 该算法用于减少HFR对比增强超声数据中的信号损失.
  • 使用体外和患者数据验证了有效性.

主要成果:

  • 基于PID的相位补偿算法在高速区域显著提高了图像强度,高达6dB.
  • 在补偿后,echoPIV测量显示患者数据中的载体速度增加了27%.
  • 该算法有效地减少了与快速UCA移动相关的信号损失.

结论:

  • 基于PID的相补偿是一种可行的方法,可以减少快速流动HFR对比增强超声波的信号损失.
  • 这种技术有可能提高使用echoPIV估计血流的准确性.
  • 这些发现支持使用该算法来改进血管成像和分析.