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相关实验视频

Updated: Jan 10, 2026

Dual Raster-Scanning Photoacoustic Small-Animal Imager for Vascular Visualization
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快速而准确的腹部PDFF和R2*映射与模型装配的翻转角度调制和同时多切片 (SMS) 2D成像.

Chuanli Cheng1,2, Liwen Wan1,2, Hao Peng1,2

  • 1Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.

Magnetic resonance in medicine
|November 25, 2025
PubMed
概括
此摘要是机器生成的。

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一种新的2D翻转角度调制 (FAM) 核磁共振 (MRI) 方法,采用与模型相适应的翻转角度计算和同时的多切片 (SMS) 加速,提供快速而准确的肝脂肪分数 (PDFF) 和R2*量化. 这种方法表明与传统GRAPPA方法相比,噪声性能优越.

科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 医学物理 医学物理
  • 生物医学工程 生物医学工程

背景情况:

  • 精确量化肝脏质子密度脂肪分数 (PDFF) 和R2*对于诊断和监测肝脏疾病至关重要.
  • 目前的MRI技术可能耗时,并且可能会受到运动工件的影响.
  • 同时多切片 (SMS) 成像为加速MRI采集提供了潜力.

研究的目的:

  • 开发和验证基于在线模型的翻转角度计算方法,用于翻转角度调制 (FAM) 化学转移编码 (CSE) MRI.
  • 将FAM-CSEMRI与SMS成像进行整合,以实现加速和准确的腹部PDFF和R2*量化.
  • 评估拟议方法的性能与现有技术相比.

主要方法:

  • 使用高斯函数的新在线模型拟合方法被用于确定最佳翻转角度 (FA) 配置文件,避免代优化.
  • 集成了切片间SMS加速以提高采集效率.
  • 在3.0T进行了幻影和志愿者研究,以验证使用FAM-SMS,FAM-GRAPPA和FAM-Hybrid方法的PDFF和R2*量化,与低FA的3D采集相比.

主要成果:

  • 模拟的FA配置文件与幻象研究中的优化配置文件密切匹配,从而获得了不偏见的PDFF和R2*量化.
  • 对于PDFF (0.994-0.995) 和R2* (0.978-0.988) 的3D参考扫描,FAM-SMS显示了高相关性.
关键词:
R2* 是一个R2* 类型.在自由呼吸的CSE中.在模型上安装的FAM.质子密度脂肪分数同时的多片切片.

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  • 在体内,FAM-SMS实现了与3D采集相似的噪声水平,并且与FAM-GRAPPA相比,PDFF (18.7%) 和R2* (18.5%) 的标准偏差明显较低.

    • 结论:

    • 拟议的2D FAM方法与模拟的FA计算和SMS加速提供了快速,准确和运动稳定的肝脏PDFF和R2*成像.
    • 与GRAPPA相比,这种技术提供了优越的噪声性能,简化了MRI协议设计.
    • 该方法有望改善肝脏脂肪含量和铁过载的临床评估.