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MRM 封面文章︱深圳先进院邹超/程传力团队研发快速精准腹部脂肪与铁定量成像新技术

  • 2026-06-01 00:52:41
MRM 封面文章︱深圳先进院邹超/程传力团队研发快速精准腹部脂肪与铁定量成像新技术

撰文︱中国科学院深圳先进院

责编︱王思珍

代谢功能障碍相关脂肪性肝病‌Metabolic Dysfunction-Associated Steatotic Liver DiseaseMASLD,此前称为非酒精性脂肪肝)已成为全球最常见的慢性肝病,影响约全球四分之一人口。疾病谱从单纯肝脂肪变性可进展为脂肪性肝炎、肝纤维化、肝硬化乃至肝癌,早期精准评估肝脏脂肪含量至关重要。磁共振质子密度脂肪分数(Proton Density Fat Fraction, PDFF)成像是目前无创定量肝脏脂肪的金标准, 但通常需在屏气状态下进行三维采集,对儿童、老人及呼吸困难者适用性差,限制了其广泛临床使用。

近日,中国科学院深圳先进技术研究院(以下简称深圳先进院)生物医学与健康工程研究所、医学成像科学与技术系统全国重点实验室邹超研究员、程传力副研究员等在磁共振物理领域权威期刊Magnetic Resonance in Medicine上以封面文章发表了题为Fast and Accurate Abdominal PDFF and R2* Mapping With Model‐Fitted Flip Angle Modulation and Simultaneous Multi‐Slice (SMS) 2D Imaging的研究成果。该研究提出了一种基于模型拟合翻转角调制(Flip Angle Modulation, FAM)与同步多层(SMS)加速的二维自由呼吸成像新方法,实现了在自由呼吸状态下快速、高信噪比、高一致性的肝脏脂肪与铁定量成像。

方法创新:从离线迭代优化在线模型拟合,从单层采集多层同步

研究团队针对现有二维FAM方法中翻转角组合需随相位编码步数重复迭代优化、计算效率低的问题,提出一种高斯函数模型拟合法,可直接根据编码步数快速计算最佳翻转角曲线,避免重复优化,大幅提升计算效率与协议设计的灵活性。

同时,该方法创新性地将同步多层成像(SMS)技术引入二维FAM序列通过多层同时激发与重建,在保持高信噪比的前提下将扫描时间缩短近一半,并有效抑制了传统并行成像(如GRAPPA)在高加速比下的噪声放大问题。

研究提出的模型拟合算法与迭代算法具有很好的一致性

实验验证:体模与在体研究均表现优异

研究通过脂肪水体模多例志愿者进行系统验证,对比了所提方法(FAM-SMS)与传统三维屏气法、二维FAM结合GRAPPAFAM-GRAPPA)以及混合加速(FAM-Hybrid)等多种方案:

1体模实验显示,模型拟合翻转角曲线与优化结果高度一致,PDFFR2*测量无显著偏差(p>0.05),与三维参考方法相关性极高(PDFF: 0.994–0.995R2: 0.978–0.988)。

2在体实验中,FAM-SMS在自由呼吸下获得的PDFFR2*图像噪声水平与三维屏气采集相当,且PDFFR2*的标准差较FAM-GRAPPA分别降低18.7% 18.5%,表现出更优的噪声性能与定量稳定性。

文章结论与讨论(未来)启发与展望

临床意义:为呼吸配合困难患者提供可靠肝脏脂肪定量工具。该方法不仅解决了屏气困难患者的成像难题,通过缩短单层采集时间、抑制运动伪影,实现了真正意义上的自由呼吸、运动鲁棒定量成像。其在保持高定量准确性的同时,大幅提升扫描效率,为肝脏脂肪与铁沉积的临床筛查、随访与疗效评估提供了更加高效、稳定的成像手段。

未来,研究团队将联合多家临床中心,开展大规模、多中心的前瞻性临床研究,进一步验证该技术在更广泛人群(包括不同程度脂肪肝、铁过载及儿童、老年等呼吸配合困难患者)中的定量准确性、可重复性及临床实用性。通过建立标准化的成像协议与后处理流程,推动该技术从科研工具向临床常规检查方案转化,助力代谢相关脂肪性肝病及肝铁过载的早期筛查、精准分型与疗效评估。

同时,团队将拓展该方法在全身脂肪定量、心外膜脂肪及肾周脂肪评估等更多临床场景中的应用,探索其在不同解剖部位、不同疾病状态下的适用性。通过推动多中心数据共享与算法优化,形成基于自由呼吸、快速精准脂肪定量的临床指南,为我国肝病及代谢性疾病防控提供更加普适、高效的影像解决方案。

原文链接:https://www.nature.com/articles/s41467-026-73241-7

该研究由深圳先进院医学成像科学与技术系统全国重点实验室牵头,通讯作者为邹超研究员,第一作者为程传力副研究员。研究获得国家自然科学基金、国家重点研发计划、深圳市科技计划项目等多个项目支持。

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  1. CONNECT:[ UseTime:0.001003s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001369s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000619s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007622s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001160s ]
  6. SELECT * FROM `set` [ RunTime:0.004292s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000723s ]
  8. SELECT * FROM `article` WHERE `id` = 597197 LIMIT 1 [ RunTime:0.000945s ]
  9. UPDATE `article` SET `lasttime` = 1780585608 WHERE `id` = 597197 [ RunTime:0.001902s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.022001s ]
  11. SELECT * FROM `article` WHERE `id` < 597197 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000504s ]
  12. SELECT * FROM `article` WHERE `id` > 597197 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005512s ]
  13. SELECT * FROM `article` WHERE `id` < 597197 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001895s ]
  14. SELECT * FROM `article` WHERE `id` < 597197 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006423s ]
  15. SELECT * FROM `article` WHERE `id` < 597197 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013494s ]
0.176647s