MRI在伽玛刀术前定位中的应用价值评估(附288例分析)

Evaluation of MRI in Localization before γ-knife Treatment (Analysis of 288 Cases)

目的：评估MRI在伽玛刀术前定位中的应用价值。材料与方法：回顾性分析了288例行MRI术前定位者的成像效果，并与定位前诊断资料进行比较，比较内容为诊断意见，病灶大小，个数及病灶轮廓的清晰程度。结果：288例中284例与定位前诊断结果相符，4例定位时确诊为感染性病灶。31例转移性肿瘤中有6例定位时比定位前多出2～4个子灶。28例行大剂量（3ml／kg）增强者病灶的显示较定位前更为清晰，其中18例病灶较定位前有不同程度的增大（2～8mm）。结论；MRI在γ-刀术前定全中有较高的应用价值，依不同病种增强显示规律把握扫描时机和大剂量（3ml／kg）用药更有助于靶点病灶的检出和显示。

Purpose: To evaluate MRI in localization before γ-knife treatment. Materials and Methods: The imaging effect of 288 cases undertaken localization by MRI before γ-knife treatment was analyzed ret rospectively , and comparison to the origional diagnoses was made. The contents for comparison included di agnosis, size and number of foci, the clarity level of focis shape. Results: In 288 cases, the diagnoses of 284 cases of them were corresponding to the previous ones, 4 cases were diagnosed as infection foci, 2~4 extra foci were shown in 6 cases of 31 metastatic tumors, The appearances of foci of 28 cases receiving large dose (3ml/kg) of contrast agent were much clearer than that before localization, among which the foci of 18 cases were larger than that before localization to various degrees (2~ 8mm) .Conclusion: MRI enjoyed great impor tance in localization before γ-knife treatment. Based on property of enhancemant of different kinds of dis ease, ensuring the correct scanning time, and giving large dose (3ml/kg)of contrast agent could help to detect thd target foci.