Abstract：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， P＜0.05) 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 than 80.875° and the number of vertebra was no less than 5.75, the incidence rate of thyroid without clavicular artifacts was 91.0%. 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 scanning about the degree of jaw-pharynx angle and the number of vertebra. And it can help to decrease the influence of clavicular artifacts for thyroid, and to improve the quality of images.
胡广柱，朱大荣，韩志江. 颈部CT扫描中定位片对甲状腺锁骨伪影的预测价值[J]. 中国临床医学影像杂志, 2018, 29(7): 471-474.
HU Guang-zhu, ZHU Da-rong, HAN Zhi-jiang. Predictive value of the positioning image in neck CT scans for clavicular artifacts of thyroid. JOURNAL OF CHINA MEDICAL IMAGING, 2018, 29(7): 471-474.
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