目的：探讨MRI(核磁共振成像)在脊柱血管瘤临床诊断中的应用价值。方法：回顾性分析23例脊柱血管瘤患者的MRI影像学资料，所有患者行常规TSE序列T1WI、T2WI以及T2WI/STIR压脂的矢状面扫描和横断面扫描，其中17例患者行轴位T1WI压脂增强扫描和矢状位T1WI压脂增强扫描。结果：总检查出腰椎11例(47.8%)、胸椎受累7例(30.4%)、颈椎5例(21.7%)，包括5例多发性肿瘤，总发现病灶的有31个；T1WI低信号/T2WI等信号6例， T1WI低信号/T2WI高信号8例， T1WI等信号/T2WI高信号5例。结论：MRI不仅可以对脊柱血管瘤的组织学类型进行良好的推测，还能够对脊柱血管瘤的活动性以及潜在侵袭性进行有效评价，显示了重要的临床价值。

Objective:To investigate the clinical use value of MRI in diagnosis of vertebral hemangioma.Methods:Retrospective analysis was performed on the data of 23 vertebral hemangioma cases.All of the patients were examined by conventional lipid suppression TSE sequence for T1WI, T2WI and T2WI/STIR in sagittal and cross section.17 cases accepted axial and sagittal lipid suppression enhanced T1WI.Results:11 cases,7 cases and 5 cases were found be involved in lumbar,thoracic and cervical vertebra,respectively.31 lesions,including 5 cases of multiple neoplasm were found,and among these ones 6 showed low signal on T1WI and isointense signal on T2WI,8 showed low signal on T1WI and high signal on T2WI and 5 showed isointense signal on T1WI and high signal on T2WI. Conclusion:MRI showed a potential clinical value on diagnosis of vertebral hemangioma in exactly speculating on the histological type and effectively evaluating of the activity and invasiveness.

目的分析脑海绵状血管瘤常规MRI与磁敏感加权成像（susceptibility weighted imaging,SWI）的影像学表现,并探讨SWI对脑海绵状血管瘤的诊断价值。方法回顾性分析经手术病理证实的18例海绵状血管瘤的常规MRI及SWI影像资料,记录常规MRI T2WI、T1WI及SWI检出病灶数并测量最大病灶的大小。结果 18例海绵状血管瘤,T2WI检出病灶共25个,T1WI检出病灶共21个,SWI检出病灶共47个。T2WI和T1WI呈＂爆米花＂样高、低混杂信号,周围绕以低信号环或高信号环;SWI表现为明显低信号。SWI测得的病灶范围较T2WI、T1WI测得的范围大,且微小病灶显示多。但SWI测得的病灶大小与T2WI、T1WI比较差异没有统计学意义（P〉0.05）。结论磁敏感成像对海绵窦血管瘤的显示优于T1WI、T2WI成像。结合常规磁共振成像及SWI,可更好地显示颅内海绵状血管瘤的病变范围及微小病灶。

Objective To evaluate the diagnostic value of SWI in cerebral cavernous angioma by analyzing the imaging find-ings of conventional MRI and SWI.Methods A retrospective analysis of 18 cases confirmed by operation and pathology in patients with cerebral cavernous angioma of the conventional MRI and SWI image,recording the number of cerebral cavernous angioma in the conventional MRI T2WI,T1WI and SWI,and measuring the size of the lesion.Results 18 cases of cerebral cavernous angioma were detected by T2WI,T1WI and SWI were 25,21,47 lesions respectively.The signal of T2WI and T1WI were mixed high and low,sur-rounding by low signal ring or high signal ring,SWI showed low signal.Descending orders of the size of lesion were SWI,T2WI and T1WI.SWI showed more small lesions.But no significant differences in SWI,T2WI and T1WI measured lesion size (P>0.05).Con-clusion SWI showed cerebral cavernous angioma better than T1WI and T2WI imaging.Combined with conventional MRI and SWI can display

目的：探讨3.0T 磁共振在直肠癌术前评估中扫描序列的最优选择。方法根据指定的扫描序列对已确诊的61例直肠癌患者进行术前 T、N 分期并测量肿瘤的纵向浸润范围,将 MRI 诊断结果与术后病理结果作对照。结果 T2 WI-TRA(T2 weighted image-transverse,T2 WI-TRA)联合 DWI(diffusion weighted image,DWI)序列、T2 WI-TRA 序列、T1 WI-TRA+ DCE(T1 weighted-transverse and dynamic contrast-enhanced image,T1 WI-TRA+DCE)序列在 T 分期准确率分别为90.16%、78.69%、83.61%。薄层T2 WI-COR(T2 weighted image-coronal,T2 WI-COR)联合 DWI 序列、薄层 T2 WI-COR 序列、T1 WI-TRA+CE(T1 weighted contrast-enhanced image,T1 WI-CE)序列的 N 分期准确率分别为81.97%、73.78%、72.13%。T2 WI-SAG(T2 weighted image-sagittal, T2 WI-SAG)联合 DWI 序列测量肿瘤的纵向浸润范围与病理结果采用配对样本 t 检验分析,两者差异无统计学意义(P >0.05)。结论3.0T 磁共振在直肠癌术前 T 分期、N 分期及肿瘤纵向浸润范围评估中的最优扫描序列分别是：T2 WI-TRA 联合 DWI 序列、薄层 T2 WI-COR 联合 DWI 序列、T2 WI-SAG 序列联合 DWI 序列。

Objective To probe the prior selection of MRI scanning sequence for preoperative assessment of rectal cancer at 3.0T. Methods 61 patients with rectal cancer underwent preoperative T,N staging,and the sagittal infiltrated range of the tumor was measured according to the MR imaging.MRI findings were compared with the postoperative pathological results.Results The accu-racy of T staging by T2 WI-TRA combined with DWI,T2 WI-TRA and T1 WI-TRA+DCE was respectively 90.1 6%,78.69% and 83.61%.The accuracy of N staging by T2 WI-COR (thin layer)combined with DWI,T2 WI-COR (thin layer)and T1 WI-TRA+CE was respectively 81.97%,73.78% and 72.13%.No statistical difference in sagittal infiltration range of tumor was found between T2 WI-SAG combined with DWI and pathological results (P >0.05)by using paired samples t test.Conclusion The prior scanning sequences to determine preoperative T,N staging and to assess the vertical infiltration range of rectal cancer include T2 WI-TRA combined with DWI,T2 WI-C

目的探讨颞下窝原发肿瘤CT及MRI表现。方法回顾性分析20例经病理证实的颞下窝原发肿瘤的CT及MR资料。结果颞下窝肿瘤形态多不规则。神经鞘瘤多边界清楚(5/6),MR T1WI为等信号,T2WI为高信号肿物伴线状分隔样低信号,2例通过卵圆孔伸入中颅窝呈哑铃状生长。恶性外周神经鞘膜肿瘤边界多不清楚(4/5),MR T1WI为等信号,T2WI为不均匀高信号,病变可侵犯邻近肌肉及骨质。横纹肌肉瘤MR T1WI为等信号,T2WI为高信号。孤立性纤维性肿瘤边界清楚,MR T1WI等信号,T2WI为混杂略高信号,增强后较明显强化。腺样囊性癌边界不清,沿神经浸润生长。侵袭性多形性腺瘤MR T1WI为等、低信号,T2WI为高信号,侵犯邻近肌肉。淋巴瘤形态不规则,边界清楚,MR T1WI为低信号,T2WI为中高信号,轻度强化,内有线样血管影穿行。结论熟悉颞下窝原发肿瘤CT及MRI表现,有助于提高该部位病变诊断及鉴别诊断水平。

Objective To analyze the computed tomography (CT) and magnetic resonance imaging (MRI) appearance of tumor originating from the infratemporal fossa (ITF) .Methods 20 patients with tumor originating in the ITF confirmed by histopathological examination ,CT and MR appearance were analyzed retrospectively .Results All the tumors origina-ting from the ITF showed irregular shape .5 neurilemmomas had well-defined border (5/6) .On MR imaging ,the tumors were isointense compared to muscle on T1WI while hyperintense with hypointense septum on T2WI .2 tumors extentded to middle cranial fossa through foramen ovale and showed dumbbell-shaped .4 malignant peripheral nerve sheath tumors had ill-defined border(4/5) .The tumors were isointense on T1 WI while hyperintense on T2 WI .The tumors invaded adjacent muscle and bone .Rhabdomyosarcoma showed isointense on T1WI while hyperintense on T2WI .Solitary fibrous tumor was isointense on T1 WI while slight hyperintense on T2 WI and showed marked enhancem

目的：分析肝血色素沉着症磁共振（ MR） T2加权图像（ T2 WI）及梯度双回波T1加权图像（ T1 WI）的影像表现，评价MRI在肝血色素沉着症中的应用价值。方法回顾性分析确诊27例肝血色素沉着症患者MR图像，观察其T2 WI及梯度双回波T1 WI的肝脏信号改变。结果所有病例T2 WI均表现为肝脏实质信号不同程度减低，接近或低于同层面竖脊肌，肝脏在梯度双回波T1 WI同反相位均见信号减低，同相位图像上信号减低更明显，因此反相位信号高于同相位为其特异性征象，其中9例合并脾脏信号减低，脾脏信号反相位高于同相位。结论 T2 WI结合梯度双回波T1 WI对诊断肝血色素沉着症具有较高敏感性和特异性，MRI检查对肝血色素沉着症早期诊断和监测治疗具有重要临床价值。

Objective To analyze the manifestations of MR T2 WI and dual echo T1 WI in liver hemochroma-tosis, and evaluate the value of MRI in the diagnosis of live hemochromatosis.Methods The MRI of 27 confirmed patients with liver hemochromatosis were retrospectively analyzed, the liver signal intensity on T2 WI and dual echo T1 WI were observed.Results All 27 patients′T2 WI showed liver signal intensity reduced in a certain extent, closed to or lower than the sacrospinal muscle signal intensity on the same slice.Dual-echo T1 WI also showed the liver sig-nal intensity reduced in both in-phase and opposed-phase images, however on the in-phase images the signal intensi-ty′s loss was more obvious than the opposed-phase images.The liver signal intensity was higher on the opposed-phase images than the in-phase images.Nine patients showed signal intensity reduced in spleen, and also display higher sig-nal intensity on opposed-phase images.Conclusion T2 WI combined with dual echo T1 WI hav