磁敏感加权成像在评估胶质瘤级别中的价值

Value of susceptibility weighted imaging in glionm classification

目的探讨磁敏感加权成像（SWI）的特点与评估胶质瘤级别的作用。方法45例经手术病理证实的脑胶质瘤患者术前行平扫磁共振成像（MRI）、增强MRI和SWI检查。采用双盲法对T1WI、T2WI、增强T1WI、SWI、增强SWI等方法对肿瘤、瘤周水肿、肿瘤出血及肿瘤静脉显示上进行评分，利用测量软件对肿瘤低信号区进行体积测量，评估肿瘤的出血量。结果26例高级别胶质瘤中18例瘤内出现不同程度多发斑片状、索状低信号，病理学证实为瘤内出血及瘤内血管；19例低级别胶质瘤中10例瘤内出现少许斑点、线状低信号，病理证实为瘤内出血；高级别胶质瘤出血量明显高于低级别组（P〈0．05）。在肿瘤出血与肿瘤静脉的显示上，SWI明显优于T12I、T2WI（P〈0．05）。结论不同级别胶质瘤的SWI表现有明显差异，SWI有助于对胶质瘤术前进行分级。

Objective To study the characteristics of susceptibility weighted imaging （SWI） and it＇s role in ghoma classfication. Methods 45 glioma patients with pathologically confirmion, underwent preoperative plain MRI, enhanced MRI and SWI examination. By using double blind method, the score of T1WI, T2 WI, enhanced T2WI, SWI and enhanced SWI were acquired to display enhancing tumor, peritumoral edema, tumor hemorrhage and tumor vein. The tumor volume of low signal areas was measured by using measurement software to acquire the bleeding of tumor. Results In 26 cases of high grade gliomas, 18 patients with intratumoral, multiple patchy low signal cords in varying degrees, which were proved by pathology as tumor hemorrhage and tumor blood vessels; in 19 case of low grade gliomas, 10 Cases occured a few spots, hnear low signal in tumor, which were proved by pathology as tumor hemorrhage; the bleeding of high grade gliomas was higher than that of the low level group （ P 〈 0.05 ）. SWI was superior to T1WI, T2WI on displaying tumor hemorrhage and tumor vein（P 〈 0.05 ）. Conclusion Different grades of glioma show obvious different display on SWI, and SWI probably be helpful for evaluation of glioma grading preoperatively.