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椎体压缩性骨折:第三代双能量 CT 在视觉和定量分析中检测骨髓水肿。

Vertebral Compression Fractures: Third-Generation Dual-Energy CT for Detection of Bone Marrow Edema at Visual and Quantitative Analyses.

机构信息

From the Departments of Diagnostic and Interventional Radiology (B.P., A.K., A.M.W., A.H., T.G., T.A.B.) and Trauma, Hand, Plastic and Reconstructive Surgery (R.W., T.M.H.), University Hospital Würzburg, Oberdürrbacher Str 6, D-97080 Würzburg, Germany; Imaging and Therapy Division, Siemens Healthcare, Forchheim, Germany (B.K.).

出版信息

Radiology. 2017 Jul;284(1):161-168. doi: 10.1148/radiol.2017162165. Epub 2017 Feb 27.

Abstract

Purpose To assess the diagnostic performance of a third-generation dual-energy computed tomographic (CT) virtual noncalcium (VNCa) technique for detection of traumatic bone marrow edema in patients with vertebral compression fractures. Materials and Methods This prospective study was approved by the institutional review board. Informed consent was obtained from all participants. Twenty-two consecutive patients with 37 morphologic vertebral fractures were studied between October 2015 and May 2016. All patients underwent dual-energy CT (90 kV and 150 kV with a tin filter) and 3-T magnetic resonance (MR) imaging. Two independent readers visually evaluated all vertebral bodies (n = 163) for the presence of abnormal bone marrow attenuation on VNCa images by using color-coded maps and performed a quantitative analysis of CT numbers on VNCa images. MR images served as the reference standard. CT numbers were subjected to receiver operating characteristic analysis to calculate cutoff values. Results In the visual analysis, VNCa images had an overall sensitivity of 64.0%, specificity of 99.3%, accuracy of 93.9%, positive predictive value of 94.1%, and negative predictive value of 93.8%. The interobserver agreement was excellent (κ = 0.85). CT numbers obtained from VNCa images were significantly different in vertebral bodies with and without edema (P < .001). Receiver operating characteristic analysis revealed an area under the curve of 0.922. A cutoff value of -47 provided sensitivity of 92.0%, specificity of 82.6%, accuracy of 84.0%, positive predictive value of 48.9%, and negative predictive value of 98.3% for the differentiation of edematous vertebral bodies. Conclusion Visual and quantitative analyses of dual-energy VNCa images showed excellent diagnostic performance for assessing traumatic bone marrow edema in vertebral compression fractures. RSNA, 2017 Online supplemental material is available for this article.

摘要

目的 评估第三代双能量 CT(DECT)虚拟非钙(VNCa)技术在检测外伤性骨髓水肿中的诊断性能,以诊断椎体压缩性骨折患者。

材料与方法 本前瞻性研究经机构审查委员会批准,所有参与者均签署知情同意书。2015 年 10 月至 2016 年 5 月,连续 22 例 37 个形态学椎体骨折患者纳入本研究。所有患者均行双能 CT(90 kV 和 150 kV 加锡滤器)和 3-T 磁共振(MR)成像检查。2 位独立观察者通过彩色编码图评估所有椎体(n = 163)VNCa 图像上异常骨髓衰减的存在情况,并对 VNCa 图像上的 CT 数值进行定量分析。MR 图像作为参考标准。对 CT 数值进行受试者工作特征分析,以计算截断值。

结果 在视觉分析中,VNCa 图像的总体敏感性为 64.0%,特异性为 99.3%,准确性为 93.9%,阳性预测值为 94.1%,阴性预测值为 93.8%。观察者间一致性极好(κ = 0.85)。有水肿和无水肿的椎体之间 VNCa 图像上的 CT 数值差异有统计学意义(P <.001)。受试者工作特征分析显示曲线下面积为 0.922。区分水肿性椎体的截断值为-47,此时的敏感性为 92.0%,特异性为 82.6%,准确性为 84.0%,阳性预测值为 48.9%,阴性预测值为 98.3%。

结论 双能 VNCa 图像的视觉和定量分析对评估外伤性骨髓水肿具有优异的诊断性能,有助于诊断椎体压缩性骨折。

放射学会,2017 年 在线补充材料可在本文中获取。

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