HR-MRI信号强度的改变在眼眶部疾病诊断中的作用  

The role of the HR-MRI signal intensity in diagnosis of the eye and orbital diseases

作　　者：周全[1] 刘斯润[1] 黄力[1] 陈金城[1] Arne-Jrn Lemke 

机构地区：[1]暨南大学附属第一医院医学影像中心,广东广州510632 [2]洪堡大学CharitéVirchow医院医学影像科,德国柏林13353

出　　处：《暨南大学学报（自然科学与医学版）》2005年第4期538-545,共8页Journal of Jinan University(Natural Science & Medicine Edition)

基　　金：教育部留学回国人员科研启动基金资助项目(教外司留[2004]180号)

摘　　要：目的:总结眼眶部疾病的HR-MRI影像表现,主要明确其HR-MRI信号强度的改变在眼眶部疾病诊断中的作用,以提高对其进行鉴别诊断的能力。方法:对诊断明确的208例眼眶部疾病的位置及其磁共振信号的变化情况进行回顾性分析。磁共振扫描采用1.5 T磁共振扫描机,用眶部表面线圈进行高分辨率扫描,SE及FSE系列常规轴位、冠状位及(或)矢状位扫描,72例行脂肪抑制扫描1、65例行增强扫描。结果:眼眶部可以被分成8区,各区有其各自的好发疾病。眼眶部疾病的MRI信号征象大致可分为4种信号表现。骨膜下区的皮样囊肿及亚急性骨膜下出血、肌锥外区的淋巴管瘤在T1WI及T2WI均为高信号;眼部脉络膜黑色素瘤在T1WI为高信号,T2WI为低信号;骨膜下区及视神经区的脑膜瘤在T1WI及T2WI均为等信号;大部分病变在T1WI为等低信号,T2WI为高信号。结论:MRI信号对眶部疾病的鉴别诊断有重要作用。结合病变的位置、发病年龄,根据MRI信号可以对大多数眼眶部肿瘤做出定性诊断。Aim： The purposes of this study are to summarize the HR - MRI signal intensity manifestations of the eye and orbital diseases and to study their role for the differential - diagnosis of those diseases. Methods： Two hundred and eight patients with eye and orbital disease identified pathologically were analysed. MRI of the orbit at 1.5 tesla was performedwith thin slice, suitable bandwidth, small field of view （FOV） and large matrix. Enhanced scanning was performed in 165 patients and 72 patients received additional fat suppression sequence. The observation was focused on the site, MR signal and enhancement of the lesions. Results： The orbit could be divided into eight different compartments： preseptal, subperiosteal, extraconal, muscles, intraconal, centage of various pathologies are located in optic nerve, lacrimal, and eyeball. A high perdifferent compartments of the orbit. According to HR- MRI signal findings, the signal manifestations were classified into four types. Dermoid cyst and subacute hematoma in subperiosteal compartment and lymphangioma in extraconal compartment showed hyperintense signal in both T1WI and T2WI. Chomidal melanomas in eye showed high signal in T1WI and low signal in T2WI. Meningiomas in subperiosteal and optic nerve compartment had isointense signal in both T1WI and T2WI and with marked enhancement. Most lesions of the eye and orbit showed iso - or hypointense on T1WI and hyperintense on T2WI. Conclusion： MRI signal intensity plays an important role in the differential diagnosis of the eye and orbital disease. A correct diagnosis may be made for the eye and orbital diseases, when those MRI signal intensity combined with the location criteria and patient＇s age are taken into account, which can provide important information for medical treatment.

关 键 词：高分辨率磁共振 表面线圈 眶部肿瘤 信号特征 

分 类 号：R863.1[医药卫生—临床医学]