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目的:研究肺癌脑转移瘤在磁敏感加权图像(SWI)上的影像特点,比较其与常规MRI在脑转移瘤显示方面的不同,探讨SWI对脑转移瘤的诊断价值。方法:回顾性分析经临床证实的肺癌脑转移患者24例,其中单发8例,多发16例。所有病例均行MR常规平扫(T1WI、T2WI、T2flair)、增强扫描及SWI扫描。结果:MR常规平扫检出146个病灶,T1WI增强扫描检出221个病灶,SWI扫描检出222个病灶,其中常规序列检出出血的瘤灶35个,SWI检出出血瘤灶113个。Friedman秩和检验显示在脑转移灶检出数目方面,常规MR平扫明显少于T1WI增强扫描和SWI序列(P<0.05),但T1WI增强扫描与SWI序列之间无统计学差异(P>0.05);在出血性瘤灶数目检出方面,SWI明显优于常规序列(P<0.05)。结论:SWI对于脑转移瘤的显示具有较高的敏感性,并在肺癌脑转移瘤内部出血显示具有一定优势。与常规MR相比,SWI能够在肺癌脑转移瘤的诊断中提供更多影像学信息。
Objective: To study the imaging features of brain metastases of lung cancer on magnetically susceptible images (SWI) and to compare their differences with conventional MRI in the display of brain metastases. To explore the diagnostic value of SWI in brain metastases. Methods: A retrospective analysis of 24 clinically confirmed patients with brain metastases of lung cancer, including 8 cases of single, multiple in 16 cases. All patients underwent conventional MR plain scan (T1WI, T2WI, T2flair), enhanced scan and SWI scan. Results: 146 lesions were detected by MR plain scanning, 221 lesions were detected by T1WI enhanced scanning, 222 lesions were detected by SWI scanning, of which 35 were hemorrhagic lesions detected by conventional sequence and 113 were detected by SWI. Friedman rank sum test showed that the number of brain metastases was significantly lower than that of T1WI enhanced scan and SWI sequence (P <0.05), but there was no significant difference between T1WI enhanced scan and SWI sequence (P> 0.05 ); SWI was significantly better than the conventional sequence in the detection of hemorrhagic tumor number (P <0.05). CONCLUSIONS: SWI is highly sensitive to brain metastases and has some advantages in internal hemorrhage of brain metastases of lung cancer. Compared with conventional MR, SWI can provide more imaging information in the diagnosis of brain metastases of lung cancer.