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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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使用双向细分EPI进行3DMR温度测量,用于跨焦超声波.

Michael Malmberg1,2, Seong-Eun Kim2, John Roberts2

  • 1Department of Biomedical Engineering, University of Utah, Salt Lake City, Utah, USA.

Magnetic resonance in medicine
|November 24, 2025
PubMed
概括

基于EPI的三维细分温度计 (segEPI) 为2D临床温度计提供了可行且准确的替代方案. 这种先进的方法提供了可比的精度和扫描时间,提高了对加热程度的理解.

关键词:
这是一个3D的3D.EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EP1 EPI EPI EP1 EPI EP1 EP1 EP1 EP2 EP3 EP2 EP3 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 EP4 is what is what is what is what is what is what is what isMRgFUSUS 的意思是聚焦式超声波的使用分段式的EPI.温度的温度的温度的温度的温度.测温仪测温仪使用方法

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科学领域:

  • 磁共振成像是一种磁共振成像技术.
  • 医学物理 医学物理
  • 热疗法监测 热疗法监测

背景情况:

  • 临床二维温度计是监测热疗法的标准.
  • 在2D温度测量中,关于精度和空间覆盖的局限性存在.
  • 在MRI序列的进步可能提供更好的温度测量解决方案.

研究的目的:

  • 评估用基于3D细分EPI的温度计 (segEPI) 取代2D温度计的可行性.
  • 为了评估3D segEPI是否达到同等的准确性,精度和扫描时间.
  • 确定快速临床整合3D segEPI的潜力.

主要方法:

  • 修改了一个 3D segEPI 序列,用于双向读取.
  • 将修改后的序列整合到临床方案中.
  • 在幻影和体内扫描中进行了聚焦超声波,以比较3D segEPI与2D温度计,分析各种插曲水平的准确性,精度和加热程度.

主要成果:

  • 3D segEPI显示与2D临床温度计的高度一致.
  • 温度一致性保持在±1°C以内,在平面内 voxel 间距为0.5 mm.
  • 3D segEPI提供了更好的加热分布的特征,尽管在半最大时有稍微更宽的全宽 (∼17%).
  • 在segEPI中的回声组合提高了温度估计精度.

结论:

  • 3D segEPI温度测量是一种可行的,有前途的替代方案,可以替代当前的2D临床方法.
  • 这项技术显示了将其无整合到现有的临床工作流程中的潜力.
  • 3D segEPI通过改进的空间信息来增强热疗法的监控.