European Radiology:谁说MR不适合看骨头?多模态MR技术在绝经后女性骨密度评估中的应用

2022-06-08 shaosai MedSci原创

骨质疏松症的诊断及评估的两个参考标准是定量计算机断层扫描(QCT)和双能量X射线吸收仪,QCT因通过三维成像测量骨矿物质密度(BMD)而具有优越性。

骨质疏松症是一种全身性的骨代谢疾病,以骨矿物质含量减少和骨组织的微观结构变化为特征,在绝经后妇女中最为常见。随着骨强度的下降,骨质疏松症导致的脆性骨折和死亡的风险明显增加。因此,早期诊断和监测骨质疏松症的进展以防止脆性骨折及其引起的并发症越来越重要

骨质疏松症的诊断及评估的两个参考标准是定量计算机断层扫描(QCT)和双能量X射线吸收仪,QCT通过三维成像测量骨矿物质密度(BMD)而具有优越性。然而,在探讨骨质疏松症时,应强调骨微环境结构的动态变化,包括骨髓成分、血管化、矿化和水等成分。因此磁共振成像(MRI)可成为研究骨髓众多结构和生理特性的有用成像工具。具体来说,由于成骨细胞和脂肪细胞起源于一种共同的祖细胞,MRI对脂肪成分的量化已经成为学者们研究的目标之一。

一些基础研究报告了髓内血管在骨质疏松症进展中的重要作用,并评估了其治疗反应,动态对比增强MRI(DCE-MRI)是实现这一目标的合适技术。然而,由于其技术的复杂性和耗时性,很难将标准的腰椎MRI方案纳入骨质疏松症的常规筛查中。体内非相干运动(IVIM)可以通过使用多个b值分别对组织内的扩散和微循环进行量化。据我们所知虽然有一些关于骨髓疾病的扩散技术的报道,但扩散序列还没有得到应用。

近日,发表在European Radiology杂志的一项研究通过Q-Dixon和缩小的FOV IVIM定量参数获得与QCT有关的骨髓微环境信息,探讨了MRI技术应用于绝经后妇女的骨质疏松症的机会性诊断的价值。

本研究招募了105名绝经后的女性受试者,每位患者都接受了3T磁共振成像,包括T2*校正的Q-Dixon和缩小视野(dissen-FOV)的IVIM序列。Q-Dixon和IVIM参数的测量是在L3椎体上进行的。BMD值是用定量计算机断层扫描(QCT)检查获得的,以此作为参考标准。类内相关系数(ICC)用来评估不同观察者之间的测量重现性。进行了单因素方差分析、Spearman分析和受试者工作特性曲线分析。 

三组之间的FF、T2*和Dslow值存在明显差异(P = 0.011,P = 0.021,P = 0.015)。FF和T2*值与BMD呈负相关(r = - 0.747,p < 0.001;r = - 0.498,p = 0.007)。Dslow和f值与BMD呈正相关(r = 0.659,p < 0.001;r = 0.472,p = 0.012)。Dslow值与FF值呈明显的负相关(r = 0.659,p < 0.001)。f值与FF值呈中度负相关(r = - 0.387,p = 0.026)。Q-Dixon模型在区分正常和异常BMD(骨质稀少和骨质疏松症)的敏感性(89.2%)、特异性(92.7%)和准确性(91.4%)都优于IVIM模型。相反,IVIM模型在区分骨质稀少症和骨质疏松症方面优于Q-Dixon模型;其敏感性、特异性和准确性分别为85.4%、81.5%和83.8%。 


 在QCT Pro工作站上进行BMD测量。在轴图像(红色)和矢状图像(黄色)中自动绘制ROI,并进行手动调整。所有受试者被分为正常组(a)、骨质稀少组(b)和骨质疏松组(c)

本研究表明,可使用T2*校正的Q-Dixon和缩小的FOV IVIM技术对腰椎骨质疏松症进行评估,两者的衍生参数可以作为可靠的预测指标来检测绝经后女性的骨量变化,因此使用多模态MRI观察骨质疏松症发生的微观变化十分必要。

原文出处:

Xiangwen Li,Rong Lu,Yuxue Xie,et al.Identification of abnormal BMD and osteoporosis in postmenopausal women with T2*-corrected Q-Dixon and reduced-FOV IVIM: correlation with QCT.DOI:10.1007/s00330-021-08531-3

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    2023-04-28 feather89
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    2022-07-28 redcrab
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    2022-06-08 zxxiang

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