甲状腺专用表面线圈在甲状腺MRI中的图像质量研究  

Application of a dedicated surface coil in thyroid MRI provides superior image quality

作　　者：杨倩 邹丽艳 刘周 邓文明 张妙如 宋晓敏 李天然 王云飞 罗德红 YANG Qian;ZOU Liyan;LIU Zhou;DENG Wenming;ZHANG Miaoru;SONG Xiaomin;LI Tianran;WANG Yunfei;LUO Dehong(Department of Radiology,National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital&Shenzhen Hospital,Chinese Academy of Medical Sciences and Peking Union Medical College,Shenzhen 518116,China;Department of Radiology,National Cancer Center/National Clinical Research Center for Cancer,Chinese Academy of Medical Sciences and Peking Union Medical College,Beijing 100021,China)

机构地区：[1]国家癌症中心/国家肿瘤临床医学研究中心/中国医学科学院北京协和医学院肿瘤医院深圳医院放射诊断科,深圳518116 [2]国家癌症中心/国家肿瘤临床医学研究中心/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：《磁共振成像》2021年第2期57-61,共5页Chinese Journal of Magnetic Resonance Imaging

基　　金：中国医学科学院肿瘤医院深圳医院院内科研课题(编号:SZ2020ZD005)。

摘　　要：目的探讨8通道特制甲状腺专用表面线圈对甲状腺磁共振检查图像质量的影响。材料与方法对49名健康志愿者使用8通道甲状腺专用表面线圈行甲状腺磁共振检查,扫描序列包括T1WI、T2WI、T2WI-FS(fat-suturation)、扩散加权成像(diffusion weighted imaging,DWI)-STIR和DWI-FOCUS。然后对图像质量进行主观评价和客观评价,主观评价为由两名影像诊断经验丰富的医师依据Likert Scale评分法对图像质量进行双盲评价,并对评分结果进行一致性分析。客观评价为测量不同序列图像甲状腺组织的信号强度、信噪比和对比噪声比,并对左右叶甲状腺组织的一致性进行分析。结果基于主观评分标准,两名评分者评分结果为:T1WI、T2WI和T2WI-FS评分均达到4分以上,DWI-STIR和DWI-FOCUS序列均达到3分以上,二者对T1WI、T2WI、T2WI-FS、DWI-STIR和DWI-FOCUS各序列评分一致性分别为0.92、0.94、0.96、0.93和0.89。基于客观评价,T1WI、T2WI、T2WI-FS、DWI-STIR和DWI-FOCUS各序列甲状腺组织信号强度分别为1246.39、1345.03、860.88、236.91和569.06,左右叶一致性分别为0.957、0.937、0.924、0.871和0.848。各序列甲状腺组织信噪比分别为17.56、33.18、42.82、27.99和19.53,左右叶一致性分别为0.945、0.957、0.885、0.825和0.773。各序列甲状腺组织对比噪声比分别为0.20、5.36、3.07、16.01和9.91,左右叶一致性分别为0.577、0.704、0.740、0.710和0.589。结论使用甲状腺专用表面线圈扫描图像主观评分高,信号均匀,信号强度、信噪比以及对比噪声比高,可以满足诊断要求。Objective:To evaluate the quality of thyroid gland magnetic resonance images acquired using a surface coil exclusively designed for thyroid gland.Materials and Methods:In this prospective study,forty-nine volunteers underwent MR examination using the surface coil exclusively designed for thyroid gland under a thyroid MR protocol including T1WI,T2WI,T2WI-FS(fat-suturation),DWI-STIR(diffusion weighted imaging-STIR)and DWI-FOCUS.For the qualitative evaluation,double-blinded evaluation was performed by two experienced radiologists on the image quality according to the Likert Scale scoring criteria,and then the consistency of the scoring results was analyzed.As for quantitative evaluation,the consistency in signal intensity,signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)measured between each lobe of the thyroid gland on the MR images with different sequences was analyzed.Results:Based on the subjective scoring criteria,all of the T1WI,T2WI,T2WI-FS images were rated no less than 4 points,while all of DWI-STIR and DWI-FOCUS images were rated no less than 3 points by two radiologists.Two radiologists agreed perfectly in the ratings of T1WI,T2WI,T2WI-FS,DWI-STIR and DWI-FOCUS sequences with consistency of 0.92,0.94,0.96,0.93 and 0.89,respectively.For the objective evaluation in consistencies between two lobes of thyroid gland for the T1WI,T2WI,T2WI-FS,DWI-STIR and DWI-FOCUS sequences,consistency of 0.957,0.937,0.924,0.871 and 0.848 for the mean signal intensities,0.945,0.957,0.885,0.825 and 0.773 for the signal-to-noise ratio,0.577,0.704,0.740,0.710 and 0.589 for the contrast-to-noise ration were obtained with mean signal intensities of 1246.39,1345.03,860.88,236.91 and 569.06,SNRs of 17.56,33.18,42.82,27.99 and 19.53,CNRs of 0.20,5.36,3.07,16.01 and 9.91,respectively for each sequence.Conclusions:The thyroid MR images acquired using the exclusively designed surface coil have high subjective rating scores,homogeneous signal intensity,high consistency in signal intensity,signal-to-noise ratios and contrast-to-no

关 键 词：甲状腺 磁共振成像 图像质量评价 表面线圈 信噪比 

分 类 号：R445.2[医药卫生—影像医学与核医学] R581[医药卫生—诊断学]