在放射治疗中利用基于迪克逊的磁共振成像用于骨盆骨髓成像
Chuyan Wang1, Haoping Xu2,3, Zhenkui Wang4
1Institute for Medical Imaging Technology, Ruijin Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 201801, China.
Physics and imaging in radiation oncology
|October 13, 2025
概括
基于DIXON的MRI准确量化盆腔骨髓脂肪分数,为骨髓节约性放射治疗提供了一个有前途的工具. 这种技术显示出高精度和可重复性,解决了目前评估骨髓损伤的方法的局限性.
科学领域:
- 放射学和成像科学 放射学和成像科学
- 瘤学和辐射疗法治疗
- 生物医学工程 生物医学工程
背景情况:
- 盆腔放射治疗可能导致骨髓 (BM) 损伤,对患者的治疗结果产生负面影响.
- 目前用于放射治疗中的BM量化方法缺乏标准化,并受到磁共振光谱 (MRS) 的限制.
- 基于DIXON的MRI的质子密度脂肪分数 (PDFF) 是BM变化的新兴生物标志物.
研究的目的:
- 评估基于DIXON的MRI在放射治疗中量化骨盆骨髓 (BM) 的潜力.
- 优化和比较三种基于DIXON的技术,用于BM评估中的临床应用.
- 在盆腔BM分析中建立基于DIXON的MRI标准化协议.
主要方法:
- 优化了三种基于DIXON的MRI技术,并比较了它们的性能.
- 在体外测量中使用脂肪幻象进行了测量,并对温度测量分析进行了校准.
- 在30名志愿者身上进行了体内测量,使用MRS作为定量准确性,可重复性 (ICC) 和图像质量 (ACR幻影) 的参考标准.
主要成果:
- 基于DIXON的优化序列显示出高精度,体外平均绝对误差 (MAE) ≤5.9%,体内R2 ≥0.93,MAE ≤7.6%,与MRS相比.
- 所有经过测试的基于DIXON的序列都表现出极好的重复性 (ICC ≥ 0.97).
- 这些技术清楚地可视化了骨髓脂肪变异,没有单一的序列在图像质量方面始终超过其他序列.
结论:
- 基于DIXON的PDFF量化是准确的,可重复的,并为骨髓评估提供高图像质量.
- 这种技术显示出改善骨髓节约放射治疗的巨大潜力.
- 基于DIXON的MRI为MRS提供了一个可行的替代方案,用于在放射治疗规划中标准化骨盆骨髓评估.
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