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Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...

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斑块背后的成像:使用活性衰减校正的代方案改进了血液流量量化.

Jelle Plomp1, Ashkan Ghanbarzadeh-Dagheyan2, Michel Versluis3

  • 1Multi-Modality Medical Imaging Group, TechMed Center, University of Twente, Enschede, The Netherlands; Physics of Fluids Group, TechMed Center, University of Twente, Enschede, The Netherlands.

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概括

这项研究引入了活性衰减校正 (ISAAC) 的代方案,以改善使用echoPIV. echoPIV的血液流量量测量. ISAAC增强了信号幅度,减少了有声阴影的患病动脉的速度估计错误.

关键词:
积极的补偿积极的补偿动脉样硬化斑块是一种动脉样硬化斑块.减弱校正的纠正 减弱校正的纠正血液流动成像 血液流动成像传递apodization的传播方式超声波采集 超声波采集 超声波采集超声波粒子图像测速仪.

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科学领域:

  • 医疗成像医学成像
  • 超声波技术 超声波技术 超声波技术
  • 流体动力学 流体动力学

背景情况:

  • 高率 (HFR) 增强对比的超声波与粒子图像速度计 (PIV),称为echoPIV,可以在患病的动脉中进行血流分析.
  • 动脉样硬化斑块的声影阻碍了通过导致信号损失来准确量化流量.
  • 补偿全球风险减弱,在未受影响地区破坏对比剂.

研究的目的:

  • 开发一种局部增强信号振幅的方法,以提高在有声阴影的情况下流量量化的准确性.
  • 为了解决当前echoPIV技术的局限性,由于在患病动脉成像中信号减弱引起的局限性.

主要方法:

  • 开发了一种活性衰减校正 (ISAAC) 的代方案,根据声学模型调整传感器的apodization.
  • 在HFR记录之前,ISAAC会在本地代地修改声压,以补偿信号衰减.
  • 该方法在体外验证,使用具有不同衰减水平的幻影,然后进行PIV分析.

主要成果:

  • 如果没有ISAAC,速度估计错误超过20%,减弱度超过6.4dB.
  • 对于减弱到8.5dB,ISAAC将误差降低到10%以下,对于减弱到10.6dB,则降低到20%以下.
  • 结果表明,尽管信号损失很大,ISAAC在提高准确性的有效性.

结论:

  • 拟议的ISAAC有效地弥补了阴影地区的声信号损失.
  • ISAAC显著提高了来自echoPIV的流速的准确性.
  • 这种方法提高了复杂血管几何形状的非侵入性血液流量量化的可靠性.