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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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强大的脂肪抑制高分辨率DWI在5T使用切片选择梯度调制和化学转移编码.

Fan Liu1, Yiming Dong2, Wending Tang3

  • 1Center for Biomedical Imaging Research, School of Biomedical Engineering, Tsinghua University, Beijing, China.

Magnetic resonance in medicine
|December 22, 2025
PubMed
概括

结合切片选择梯度调制 (SSGM) 和迪克森的新两步策略有效地增强了5特斯拉 (5T) 多拍EPI扩散权重成像 (ms-EPI DWI) 的脂肪抑制. 这一进步提高了各种解剖学和应用的图像质量.

关键词:
5 T T T 5 T T T T 5 T T T 5 T T T 5 T 5 T T 5 T T 5 T T 5 T T 5 T T 5 T T 5 T T 5 T T 5 T 5 T 5 T 5 T 5 T T 5 T 5 T 5 T 5 T 5 T 5 T 5 T T 5 T 5 T 5 T T 5 T 5 T 5 T 5 T 5 T 5 T T 5 T T 5 T 5 T 5 T 5 T T 5 T 5 T 5 T 5 T 5 T 5 T T T 5 T T 5 T T 5 T T T 5 T T 5 T T 5 T T 5 T T T T 5 T T 5 T T T 5 T T T 5 T T 5 T T T T 5 T T T 5 T T T 5 T T T 5 T T T T 5 T T 5 T T T 5 T T 5 T T T T 5 T T T T 5 T T T 5 T T T 5 T T 5 T T T 5 T T 5 T T T 5 T T 5 T T T 5 T T 5 T T 5 T T T 5 T 5 T T 5 T T T 5 T T 5 T T T T 5 T 5 T T 5 T T 5 T T T 5 T 5 T T T T T 5 T T 5 T T T 5 T T 5 T T T 5 T T T 5 T T T T 5 T T T T T T T 5 T T T T 5 T T T T T 5 T T T T 5 T T T T 5 T T T T 5 T T T T T T T 5 T T T T T T T T T T T T T T T T T T T T T 6 T T T T T T T T T T T T T T T T T T was was was by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by by迪克森·迪克森 (Dixon Dixon) 是一个扩散加权成像技术的使用.多次射击的EPI可以使用多次射击.水与脂肪的分离方法

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 生物医学工程 生物医学工程
  • 放射学 放射学是一门学科.

背景情况:

  • 化学转换编码 (Dixon) 在3特斯拉 (3T) 的多次EPI扩散权重成像 (ms-EPI DWI) 中有效抑制脂肪.
  • 在5特斯拉 (5T) 时,脂肪偏振频率的增加会导致切片位置的不匹配,使得标准的迪克森方法在同时抑制脂肪时无效.
  • 现有的脂肪抑制技术,如SPAIR (光谱减弱倒置恢复) 在ms-EPI DWI的5T上显示出局限性.

研究的目的:

  • 开发和评估一种新的两步策略,结合切片选择梯度调制 (SSGM) 和迪克森,在5T ms-EPI DWI中增强脂肪抑制.
  • 为了克服标准迪克森方法在5T的局限性,由于脂肪偏振频率增加.
  • 为了提高5T ms-EPI DWI的图像质量和诊断潜力.

主要方法:

  • 实施了两步策略: 1) 切片选择梯度调制 (SSGM) 以激发但不重定位特定的脂肪峰值 (甲基/甲).
  • 2) 迪克森方法与联合水/脂肪分离算法,使用结构化的低级调整来分离剩余的脂脂肪峰.
  • 该方法在腿部,头部和部以及前列腺成像中进行了体内评估.

主要成果:

  • 结合SSGM和迪克森的策略成功地实现了5T的同时脂肪抑制,与只有迪克森的方法不同.
  • 与SPAIR相比,SSGM表现出优异的甲基/甲脂肪抑制,随后Dixon去除了残留的脂脂肪.
  • 在所有测试的解剖学中观察到整体图像质量的改善,包括高分辨率 (1.6毫米同位素) 和高b值 (2800秒/毫米2) 的前列腺成像.

结论:

  • 拟议的两步SSGM和迪克森策略显著增强5T ms-EPI DWI中的脂肪抑制.
  • 这种改善的脂肪抑制有潜力推进全身疾病查和诊断使用5TMRI.
  • 该方法适用于各种成像场景,包括减少视野采集.