MRI三期增强扫描对脑转移瘤的诊断价值  

The diagnostic value of three-phase enhanced MRI for brain metastases

作　　者：朱冬 汤若琪 徐金娥 张建军[2] 刘冲[2] ZHU Dong;TANG Ruoqi;XU Jin'e;ZHANG Jianjun;LIU Chong(Graduate School of Chengde Medical College,Hebei Chengde 067000,China;Department of Medical Imaging,the First Central Hospital of Baoding City,Hebei Baoding 071000,China)

机构地区：[1]承德医学院研究生院,河北承德067000 [2]保定市第一中心医院医学影像一科,河北保定071000

出　　处：《现代肿瘤医学》2023年第3期513-516,共4页Journal of Modern Oncology

摘　　要：目的:对比MRI三期增强扫描对脑转移瘤的敏感性及诊断价值,评估最佳增强扫描时间。方法:对40例临床拟诊为脑转移瘤患者,均行磁共振T1WI轴位即时增强扫描、5 min增强扫描及10 min增强扫描,据此分为三组,统计并比较三组图像中脑转移瘤的数量、体积、信号强度比。结果:40例患者中,三组分别显示病灶136个、163个、173个。整个肿瘤体积的中位数在三组分别为79.2 mm^(3)、102.4 mm^(3)、116.8 mm^(3),延迟5 min和10 min的肿瘤体积明显大于即时增强的肿瘤体积(P<0.0001)。病灶信号强度比在三组分别为0.16、0.19、0.20,延迟10分钟图像肿瘤增强部分信号强度比明显大于即时增强图像肿瘤的信号强度比(P<0.05),延迟5 min和10 min的图像之间没有显著差异(P=0.65)。结论:注射钆造影剂后的10分钟左右行MRI增强扫描对脑转移瘤的检测具有较高的敏感性。Objective:To evaluate the sensitivity of delayed-enhanced MRI scan in diagnosing brain metastases after injection of contrast agent,and explore the best delay time.Methods:40 patients with brain metastases under-went T1WI axial enhancement scan,and then underwent two T1WI axial enhancement scans every 5 minutes.Accord-ing to the time of enhancement,the patients were divided into instant enhancement group,5 min delayed enhancement group and 10 min delayed enhancement group.The number,volume and signal intensity ratio of brain metastases in the three groups of images were compared.Results:Among 40 patients,three groups showed 136,163,and 173 lesions,respectively.The median of the entire tumor volume in the three groups was 79.2 mm^(3),102.4 mm^(3),116.8 mm^(3).The tumor volume delayed by 5 min and 10 min was significantly larger than the tumor volume with immediate enhancement(P<0.0001).The signal intensity ratio of the lesion was 0.16,0.19,0.20 in the three groups.The sig-nal intensity ratio of the tumor enhancement part on the image delayed by 10 minutes was significantly greater than the signal intensity ratio of the tumor on the immediate enhancement image(P<0.05),but there is no significant difference between the images delayed by 5 min and 10 min(P=0.65).Conclusion:MRI-enhanced scan about 10 mi-nutes after the injection of gadolinium contrast agent has high sensitivity in detecting metastases.

关 键 词：磁共振成像 脑转移瘤 延迟增强扫描 

分 类 号：R742[医药卫生—神经病学与精神病学]