摘要
目的探讨脂肪抑制技术在多肌炎、皮肌炎MRI诊断中的应用价值。方法回顾性分析比较46例经临床确诊多肌炎或皮肌炎患者双侧大腿MRI表现。常规行快速自旋回波序列T1W、T2W及抑脂序列(短时反转恢复序列STIR或频率预饱和反转恢复序列SPIR)。观察比较抑脂序列与常规T1W、T2W序列在病变检出能力上的差异。结果⑴本组46例患者中有43例于MRI上发现不同程度异常表现,提示肌炎33例、筋膜炎40例、皮下结缔组织炎20例、骨髓水肿13例、肌肉萎缩5例。⑵在抑脂序列上,除了肌肉萎缩,其它异常表现悉数发现;T1W上发现皮下结缔组织炎12例、骨髓水肿5例、肌肉萎缩5例,未发现肌炎、筋膜炎;T2W上发现肌炎10例、肌肉萎缩5例,未发现筋膜炎、皮下结缔组织炎、骨髓水肿。⑶T1W上发现的12例皮下结缔组织炎、5例骨髓水肿以及T2W上发现的10例肌炎患者,均处于急性期或亚急性期;T1W和T2W上发现的5例肌萎缩患者均处于慢性期;慢性期患者中发现的3例轻度肌炎、10例轻度筋膜炎均只在抑脂序列上发现,T1W或T2W上未见显示。结论使用脂肪抑制技术可以明显提高MRI上软组织炎性病变的检出,抑脂序列应作为多肌炎、皮肌炎患者软组织MRI检查的首选序列。
Objective：To discuss the application value of fat suppression techniques in the MRI diagnosis of polymyositis and dermatomyositis.Materials and Methods：The MRI appearances of the bilateral thighs in 46 patients with polymyositis or dermatomyositis were reviewed,using T1W,T2W and fat suppression sequences （short time inversion recovery or spectral presaturation with inversion recovery）.The abilities of detecting lesions among T1W,T2W and fat suppression sequences were observed and compared.Results：（1） Abnormalities in the MRI appearances of bilateral thighs were found in 43 cases,which representing myositis in 33 cases,fasciitis in 40 cases,subcutaneous inflammation in 20 cases,marrow edema in 13 cases and myoatrophy in 5 cases.（2） All the abnormalities mentioned above were discovered in fat suppression sequences except myoatrophy.There were 12 cases of subcutaneous inflammation,and 5 cases of marrow edema to be found on T1W,however,no cases of myositis or fasciitis were displayed obviously.There were 10 cases of myositis and 5 cases of myoatrophy to be found,on T2W,however,fasciitis,inflammation in subcutaneous connective tissues and marrow edema were failed to be displayed.（3） Twelve cases with subcutaneous inflammation and 5 cases with marrow edema were observed on T1W,10 cases with myositis observed in T2W,were all at the acute or subacute stage at that time.Five cases with myoatrophy observed in both T1W and T2W were all at the chronic stage.Three cases with slight myositise and 10 cases with slight fasciitis were observed only in the fat suppression sequences among the patients at the chronic stage,all of which were failed to be observed in T1W and T2W.Conclusion The application of MR fat suppression techniques can help to increase the detection of inflammatory lesions in soft tissues obviously.The fat suppression sequences are prefered when proceeding the MRI exam for polymyositis and dermatomyositis.
出处
《磁共振成像》
CAS
2011年第2期99-103,共5页
Chinese Journal of Magnetic Resonance Imaging
基金
上海市重点学科建设项目(编号:S30203)资助
关键词
磁共振成像
多肌炎
皮肌炎
筋膜炎
脂肪抑制
短时反转恢复序列
频率预饱和反转恢复序列
Magnetic resonance imaging； Polymyositis； Dermatomyositis； Fasciitis； Fat suppression； Short time inversion recovery； Spectral presaturation with inversion recovery；
