Comparison of 1.5-and 3.0-T MR Imaging for Evaluating the Articular Cartilage of the Knee Joint
Comparison of 1.5-and 3.0-T MR Imaging for Evaluating the Articular Cartilage of the Knee Joint
复制标题
DOI：
10.1148/radiol.2503080822
复制
发表时间：
2009-03-01
期刊：
影响因子：
19.7
通讯作者：
De Smet, Arthur A.
中科院分区：
文献类型：
--
作者：
Kijowski, Richard;Blankenbaker, Donna G.;De Smet, Arthur A.
目的：回顾性比较1.5-和3.0-T磁共振（MR）成像协议的诊断性能，用于评估膝关节的关节软骨症状patients.Materials和Methods：这符合健康保险责任法案的研究进行了知情同意的机构审查委员会的豁免。研究组由200名在1.5 T（61名男性，39名女性;平均年龄38.9岁）或3.0 T（52名男性，48名女性;平均年龄39.1岁）下接受膝关节MR检查的有症状患者组成，这些患者随后还接受了膝关节镜手术。所有MR检查均由多平面快速自旋回波序列组成，在1.5和3.0 T下具有相似的组织对比度。在关节镜下使用Noyes分类系统对所有关节面进行分级。三位肌肉骨骼放射科医生采用类似的分类系统对MR成像中观察到的所有关节面进行回顾性和独立的分级。以关节镜检查为参考标准，测定1.5 T和3.0 T MR检测软骨病变的敏感性、特异性和准确性。z检验用于比较1.5和3.0 T下的灵敏度、特异性和准确度值。对于所有阅片者，MR成像检测软骨病变的灵敏度、特异性和准确性分别为69.3%、78.0%和74.5%（1.5 T，n = 241）和70.5%、85.9%、3.0T时为80.1%（n = 226）。MR成像协议有显着更高的特异性和准确性（P <0.05），但没有更高的灵敏度（P = 0.73）检测软骨病变在3.0 T比在1.5 T。结论：3.0 T MR协议有改善诊断性能评估关节软骨的膝关节症状患者相比，1.5 T协议。(c)RSNA，2009年
Purpose: To retrospectively compare the diagnostic performance of 1.5- and 3.0-T magnetic resonance (MR) imaging protocols for evaluating the articular cartilage of the knee joint in symptomatic patients.Materials and Methods: This HIPAA-compliant study was performed with a waiver of informed consent from the institutional review board. The study group consisted of 200 symptomatic patients undergoing MR examination of the knee at 1.5 T (61 men, 39 women; mean age, 38.9 years) or 3.0 T (52 men, 48 women; mean age, 39.1 years), who also underwent subsequent arthroscopic knee surgery. All MR examinations consisted of multiplanar fast spin-echo sequences with similar tissue contrast at 1.5 and 3.0 T. All articular surfaces were graded at arthroscopy by using the Noyes classification system. Three musculoskeletal radiologists retrospectively and independently graded all articular surfaces seen at MR imaging by using a similar classification system. The sensitivity, specificity, and accuracy of the 1.5- and 3.0-T MR protocols for detecting cartilage lesions were determined by using arthroscopy as the reference standard. The z test was used to compare sensitivity, specificity, and accuracy values at 1.5 and 3.0 T.Results: For all readers combined, the respective sensitivity, specificity, and accuracy of MR imaging for detecting cartilage lesions were 69.3%, 78.0%, and 74.5% at 1.5 T (n = 241) and 70.5%, 85.9%, and 80.1% at 3.0 T (n = 226). The MR imaging protocol had significantly higher specificity and accuracy (P < .05) but not higher sensitivity (P = .73) for detecting cartilage lesions at 3.0 T than at 1.5 T.Conclusion: A 3.0-T MR protocol has improved diagnostic performance for evaluating the articular cartilage of the knee joint in symptomatic patients when compared with a 1.5- T protocol. (c) RSNA, 2009