European Radiology:增强CT和MRI在手部关节炎中的应用

2022-08-24 shaosai MedSci原创

到目前为止,双能量CT(DECT)已经发展成为诊断痛风性关节炎的重要影像学工具,CT减影(CT-S)和DECT衍生的碘图(iMap)可以检测出关节内活动性软组织炎症的造影剂摄取,并具有足够的诊断准确性

众所周知滑膜炎和腱鞘炎的早期检测在关节炎影像学检查中具有重大意义,早期治疗防止不可逆的骨和关节破坏,有助于保护关节功能并提高患者的生活质量。

目前的关节炎诊断标准包括肌肉骨骼超声(MSUS)和磁共振成像(MRI)。由于特异性相对较低,MRI不再是首选的成像方式。MSUS更容易获得,并提供比MRI更高的空间分辨率,已经成为诊断早期关节炎的首选影像学手段

到目前为止,双能量CT(DECT)已经发展成为诊断痛风性关节炎的重要影像学工具,CT减影(CT-S)和DECT衍生的碘图(iMap)可以检测出关节内活动性软组织炎症的造影剂摄取,并具有足够的诊断准确性。此外,CT在检测骨侵蚀方面有决定性的优势,是一种快速、标准化的成像手段

近日,发表在European Radiology杂志的一项研究使用iMap和CT-S这两种技术评估可疑似手部类风湿性关节炎患者的滑膜炎和腱鞘炎,并与以MSUS为参考标准的MRI比较了其诊断准确性。

本项前瞻性研究对本机构的关节炎患者进行了评估。所有患者都接受了手部的MSUS、MRI和对比度增强的DECT检查,从后者中重建了常规CT-S、基于图像的iMap(iMap-I)和基于原始数据的iMap(iMap-RD)。应用改良的类风湿性关节炎MRI评分(RAMRIS)对CT和MRI数据集的滑膜炎和腱鞘炎/副腱鞘炎进行了评分,并计算了敏感性、特异性和诊断准确性。使用单尾的McNemar检验来检验非劣效性。总分的相关性用皮尔逊检验来评估。阅读者之间的可靠性使用Cohen's kappa来评估。 

总共有33名患者被纳入研究。28名患者的MSUS对滑膜炎和腱鞘炎/副腱鞘炎呈阳性,总分是6.91分。CT-S(总分6.38;r = 0.91)、iMap-RD(总分9.74;r = 0.82)、MRI(总分12.70;r = 0.85)和iMap-I(总分6.94;r = 0.50)与MSUS的相关性极佳。CT-S的诊断准确性最高,为83%,其次是iMap-I(78%)、MRI(75%)和iMap-RD(74%)。所有模式都显示出非劣质性。读者对CT-S和MRI的一致性良好(κ=0.62;0.64),对iMap-RD和iMap-I的一致性一般(κ=0.31;0.37)。 


图 冠位和轴位方向的成像实例。MRI(T1fs Gd+)=脂肪饱和对比增强T1加权序列MRI;iMap-I=基于图像数据的双能量CT碘图;iMap-RD=基于原始数据的双能量CT碘图;CT-S=CT减影。患者A:50岁的女性患者,血清阴性类风湿性关节炎。未发现关节炎症变化,如掌指关节II(MCP)(箭头)。注意在骨和皮肤边界的部分容积效应(箭头)。患者B:一个55岁的女性患者,血清阴性类风湿关节炎。在MCP V(箭头)和桡骨掌关节(箭头)有严重的滑膜炎。此外,在所有的检查方式中都发现了屈肌腱II-V的严重腱鞘炎(箭头),而iMap-I往往低估了腱鞘炎III(箭头)和CT-S腱鞘炎V(箭头)

本研究表明,CT-S和iMap可以实现高度标准化的关节炎成像,并适合于临床实践。

 

原文出处:

Sevtap Tugce Ulas,Katharina Ziegeler,Sophia-Theresa Richter,et al.Contrast-enhanced CT techniques and MRI perform equally well in arthritis imaging of the hand: a prospective diagnostic accuracy study.DOI:10.1007/s00330-022-08744-0

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