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使用短轴推进器的心脏DTI:可行性研究

Mehdi Sadighi1, Danielle Kara1, Dingheng Mai1,2

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概括

使用SAP-M2-EPI的新的自由呼吸心脏扩散张力成像 (cDTI) 方法显著减少左心室的几何扭曲和异形. 这种技术可以确保精确的心肌微观结构量化,即使在体重指数较高的患者中也是如此.

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科学领域:

  • 心血管磁力共振成像 (MRI) 的方法
  • 扩散张力成像 扩散张力成像
  • 医学成像技术 医学成像技术

背景情况:

  • 心脏扩散张力成像 (cDTI) 对于评估心肌微观结构至关重要.
  • 传统的方法经常遭受几何扭曲和伪造,特别是在自由呼吸扫描和身体质量指数 (BMI) 高的人.
  • 缓解这些人工物对于精确的心肌的定量分析至关重要.

研究的目的:

  • 开发和评估一种新的自由呼吸 (FB) cDTI方法,称为SAP-M2-EPI.
  • 这种方法使用短轴推进器 (SAP) 和M2运动补偿自旋回声EPI (SAP-M2-EPI) 来解决几何扭曲和别名.
  • 目标是提高cDTI的图像质量和定量准确性,特别是在BMI较高的患者中.

主要方法:

  • 该研究包括10名健康的志愿者,他们的BMI不同 (<25,25-28,>30).
  • 心脏DTI参数 (FA,MD,HAT) 在新型SAP-M2-EPI和标准M2-ssEPI序列之间进行了比较.
  • 使用DICE相似系数 (DSC) 和错误注册区域量化几何扭曲,将SAP-M2-EPI与CINE和M2-ssEPI进行比较.

主要成果:

  • 在所有志愿者中,SAP-M2-EPI成功地产生了高质量的,无别名的LV DWI.
  • 观察到SAP-M2-EPI显著减少几何扭曲 (平均DSC为0.92,平均误报为90mm2),其性能优于M2-ssEPI.
  • 由于散装运动而导致的信号损失减少和没有运动工件的一致的DTI参数图被注意到.

结论:

  • SAP-M2-EPI可实现整个左心室的高保真,自由呼吸的cDTI.
  • 与M2-ssEPI相比,该方法有效地消除了别名并最大限度地减少了几何扭曲.
  • 保持了心肌微观结构的准确量化,为心脏MRI提供了显著的进步.