骨髓相对脂肪分数与质子密度脂肪分数相比的限制
Tamara Scott1,2, Matthew Mader1, Rianne A van der Heijden1,3
1Department Radiology, University of Wisconsin-Madison, Madison, WI.
Journal of computer assisted tomography
|November 17, 2025
概括
相对脂肪分数 (rFF) 测量骨髓脂肪的MRI测量是不准确的,不应该使用. 质子密度脂肪分数 (PDFF) 是评估骨髓脂肪含量的更可靠的MRI指标.
科学领域:
- 放射学 放射学是一门学科.
- 医疗成像医学成像
- 在瘤学瘤学.
背景情况:
- 使用双回声梯度召唤回声 (GRE) 中相和相反相 (IOP) MRI 的相对脂肪分数 (rFF) 已被提议用于评估多发性骨髓瘤治疗反应.
- 然而,rFF具有显著的局限性,导致骨髓脂肪分数测量不准确.
- 通过混校正,多声波,化学转移编码 (CSE) MRI 测量的质子密度脂肪分数 (PDFF) 是对组织脂肪含量的验证和客观指标.
研究的目的:
- 为了评估骨髓rFF与PDFF相比的线性和偏差.
主要方法:
- 100名患者 (1.5T和3.0TMRI) 的回顾性研究,包括双回声GRE IOP和多回声CSEMRI (IDEAL-IQ).
- 感兴趣的区域 (ROI) 位于T12,L1和L2脊椎体中.
- 从信号强度计算rFF;使用线性回归 (R2) 和Bland-Altman偏差分析与PDFF相关.
主要成果:
- 骨髓rFF在1.5T (R2 = 0.032) 或3.0T (R2 = 0.057) 时与PDFF没有呈现线性.
- 在rFF和PDFF之间在两个场强度之间观察到显著的偏差.
- 偏差直接与骨髓脂肪分数增加.
结论:
- 与PDFF相比,骨髓rFF是非线性的,并且具有可变偏差.
- rFF不应在研究或临床环境中用于骨髓脂肪的评估.
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