目的 分析单发脑转移瘤MRI多序 列扫描应用价值。方法 回顾性分析我院 收治且经病理证实为单发脑转移瘤的48例 患者的临床资料，所有患者均已接受MRI 多序列扫描，且影像学资料完整，记录脑 转移瘤发生部位、大小、数量、形态、 水肿、组织受累及强化特征，比较脑转移 瘤在MRI各序列表现及其诊断价值。结果 MRI平扫以T2-FLAIR序列对脑转移病灶检 出率最高，为45.83%，但MRI增强T1WI序 列对脑转移瘤病灶检出率达79.17%，明显 高于平扫T2-FLAIR序列及其他各MRI序列 检出率（P<0.05）。结论 T2-FLAIR序列 可较好显示肿瘤周边水肿，可作为脑转移 瘤平扫常规序列；在b=0条件下，DWI序列 与T2WI序列一致性好，但扫描时间短，可 替代平扫T2WI序列；增强扫描对单发脑转 移瘤病灶检出率最高。

Objective To analyze the value of MRI multiple sequence scan of single brain metastases. Methods The clinical data of 48 patients with single brain metastases confirmed by pathology in our hospital were retrospectively analyzed. All patients were canned with MRI multiple sequences, and the imaging data were complete. The sites, size, quantity, shape, edema, tissue involvement and enhancement of brain metastases were recorded. Findings of MRI sequences and their diagnostic value of brain metastases were compared. Results The detection rate of T2-FLAIR in MRI plain scan for brain metastases was the highest (45.83%), and the detection rate of MRI enhanced T1WI sequence for brain metastases (79.17%) was significantly higher than the detection rates of T2-FLAIR sequence in plain scan and other MRI sequences (P<0.05). Conclusion T2- FLAIR sequence can well show edema around the tumors and can be used as the routine sequence for plain scan of brain metastases. Under the condition of b=0, the consistency of DWI with T2WI is good but the time for scanning is short. Therefore, it can replace T2WI sequence in plain scan. The detection rate of enhanced scan for solitary brain metastases is the highest.