对比水-脂分离成像技术与频率选择饱和法在头颈部增强MRI中的脂肪抑制效果  

Comparison of fat suppression effect of Dixon and frequency-selective saturation in head and neck contrast-enhanced MRI

作　　者：邓文明 康文焱 文洁 刘周 黄华 王云飞 张艳 罗德红 DENG Wenming;KANG Wenyan;WEN Jie;LIU Zhou;HUANG Hua;WANG Yunfei;ZHANG Yan;LUO Dehong(Department of Radiology,National Cancer Center/Cancer Hospital&Shenzhen Hospital,Chinese Academy of Medical Sciences and Peking Union Medical College,Shenzhen 518116,China;Department of Diagnostic Radiology,National Cancer Center/Cancer Hospital,Chinese Academy of Medical Sciences andPeking Union Medical College,Beijing 100021,China)

机构地区：[1]国家癌症中心/中国医学科学院北京协和医学院肿瘤医院深圳医院放射科,广东深圳518116 [2]国家癌症中心/中国医学科学院北京协和医学院肿瘤医院影像诊断科,北京100021

出　　处：《中国医学影像技术》2018年第9期1390-1394,共5页Chinese Journal of Medical Imaging Technology

摘　　要：目的对比分析水-脂分离技术(Dixon技术)与频率选择饱和法(FS)在头颈部增强MRI中的脂肪抑制效果。方法对接受头颈部增强MR检查的49例患者行Dixon和FS脂肪抑制T1WI。由2名放射科医师评价其脂肪抑制效果,计算并比较2种图像间CNR和磁场中心层面(小脑、延髓)、偏离磁场中心层面(颞叶、咬肌、锁骨)的SNR。结果 49例患者的Dixon图像中,2名医师分别记录了14处和17处脂肪抑制效果不佳的区域,一致性好(Kappa=0.858,P<0.001);FS图像中分别记录192处和175处脂肪抑制效果不佳区域,一致性好(Kappa=0.890,P<0.001)。在磁场中心层面,Dixon图像噪声小于FS图像(P<0.001),小脑SNR、延髓SNR及CNR优于FS组(P均<0.05)。在偏离磁场中心层面,Dixon图像噪声小于FS图像(P=0.010),咬肌SNR优于FS图像(P=0.010),锁骨SNR小于FS图像(P<0.001);2种图像颞叶SNR和CNR差异均无统计学意义(P均>0.05)。结论对于头颈部增强MRI,应用Dixon技术较FS能获得更好的图像质量和脂肪抑制效果。Objective To evaluate the fat suppression efficacy of Dixon technique compared with frequency-selective saturation(FS)in head and neck contrast-enhanced MRI.Methods Totally 49 patients underwent contrast-enhanced T1WI of head and neck with both Dixon technique and FS technique.The efficacy of fat suppression was evaluated by two radiologists,while CNR between two sets of images and SNR of images were compared,including the center of magnetic field(corresponding to cerebellum and oblongata)and the periphery of magnetic field(corresponding to temporal lobe,masseter,and clavicle),respectively.Results Among the images acquired using Dixon technique,14 and 17 areas with unsatisfactory fat suppression were recorded by two radiologists,respectively(Kappa=0.858,P<0.001),whereas 192 and 175 areas were recorded in the images acquired using FS technique,both showed great agreement between the two radiologists(Kappa=0.890,P<0.001).In the center of magnetic field,image noise of the Dixon image was significantly lower than that of the FS image(P<0.001),while SNR in the cerebellum,oblongata and CNR of the Dixon image were all superior to those in the FS image(all P<0.05).Meanwhile,in the peripheral magnetic field,similarly,image noise of the Dixon image was significantly lower than that of the FS image(P=0.010),and SNR in the masseter of the Dixon image was higher than that of the FS image(P=0.010).However,SNR in the clavicle of the Dixon image was lower than that of the FS image(P<0.001),and no statistical difference was found in SNR of temporal lobe nor CNR between the two kinds of images(both P>0.05).Conclusion In contrast-enhanced MRI of head and neck,using Dixon technique can obtain images with quality and fat suppression better than FS technique.

关 键 词：磁共振成像 水-脂分离 频率选择饱和 脂肪抑制 

分 类 号：R653[医药卫生—外科学] R445.2[医药卫生—临床医学]