颈部CT扫描中定位片对甲状腺锁骨伪影的预测价值  

Predictive value of the positioning image in neck CT scans for clavicular artifacts of thyroid

作　　者：胡广柱 朱大荣[1] 韩志江[1] HU Guang-zhu;ZHU Da-rong;HAN Zhi-jiang(Deaprtment of Radiology,Hangzhou First People＇s Hospital,Hangzhou 310000,China)

机构地区：[1]杭州市第一人民医院放射科,浙江杭州310000

出　　处：《中国临床医学影像杂志》2018年第7期471-474,共4页Journal of China Clinic Medical Imaging

摘　　要：目的:探讨颈部CT扫描中定位片对甲状腺锁骨伪影的预测价值。方法:回顾性分析211例颈部CT扫描影像资料,测量定位片颌咽角(下颌骨下缘与咽后壁的夹角)大小和观察椎体(肩部未掩盖)数目,采用SPSS 19分析软件,对甲状腺有或无锁骨伪影的颌咽角度数及所显示的椎体数目进行统计学分析,通过受试者工作特征(ROC)曲线,获得预测甲状腺无锁骨伪影颌咽角度数的大小和椎体数目的阈值。结果:甲状腺有或无锁骨伪影的颌咽角度数(t=5.63,P<0.05)及所显示的椎体数目(t=12.29,P<0.05)具有统计学差异,颌咽角度数和椎体数目对甲状腺无锁骨伪影预测价值的ROC曲线下面积分别为0.744和0.873,随着颌咽角和椎体数目增大,预测甲状腺无锁骨伪影敏感度减低而特异度增高。当颌咽角和椎体数目分别为80.875°和5.75时,约登指数最大,分别为0.402和0.625,此时预测甲状腺无锁骨伪影的敏感度和特异度分别为64.1%和76.1%、82.1%和80.4%。当颌咽角≥80.875°且椎体数目≥5.75时,甲状腺无锁骨伪影的发生率为91.0%,当颌咽角<80.875°且椎体数目<5.75时,甲状腺无锁骨伪影的发生率为14.3%。结论:通过颈部CT定位片中颌咽角度数和椎体数目的观察,可有效对甲状腺锁骨伪影进行评估,及时采取有效措施,尽量减少甲状腺锁骨伪影的影响,提高图像质量。Objective： To evaluate the predictive value of the positioning image in neck CT scans for clavicular artifacts of thyroid. Methods： A retrospective analysis of 211 cases of neck CT scaning data was performed to measure the size of the jaw-pharynx angle（the angle between the lower edge of the mandible and the postpharyngeal wall） and the number of vertebra（shoulder not be covered）. SPSS 19 analysis software was used to analyze the degree of jaw-pharynx angle and the number of vertebra displayed in thyroid with or without clavicular artifacts, the thresholds of which would be predicted by the receiver operating characteristic（ROC） curve. Results： The degree of jaw-pharynx angle（t=5.63, P0.05） and the number of vertebra（t=12.29, P 0.05） displayed in thyroid with or without clavicular artifacts were statistically different. The area under the ROC curve of the degree of jaw-pharynx angle and the number of vertebra for the predictive value of thyroid without clavicular artifacts were 0.744 and 0.873, respectively. With the increase of degree of jaw-pharynx angle and the number of vertebra,the sensitivity of prediction of thyroid without clavicular artifacts decreased, but the specificity increased. When the degree of the jaw-pharynx angle and the number of vertebra were 80.875° and 5.75 respectively, the Youden＇s indexes were the maximum, which were 0.402 and 0.625 respectively. And at this time, the sensitivity and specificity of prediction of thyroid without clavicular artifacts were 64.1% and 76.1%, 82.1% and 80.4%, respectively. When the jaw-pharynx angle was no less than80.875° and the number of vertebra was no less than 5.75, the incidence rate of thyroid without clavicular artifacts was91.0%. When the jaw-pharynx angle was less than 80.875° and the number of vertebra was less than 5.75, thyroid without clavicular artifacts occurred at a rate of 14.3%. Conclusion： It is effective to evaluate the clavicular artifacts of thyroid by observativing the positioning image in the neck CT

关 键 词：甲状腺 体层摄影术 X线计算机 

分 类 号：R581[医药卫生—内分泌] R814.42[医药卫生—内科学]