锥形束CT影像清晰度影响因素的分析研究

Study on influential factors on the definition of CBCT images

目的评估患者锥形柬CT（CBCT）影像清晰度，探讨其影响因素。方法选择2014年1：2腔科患者的CBCT影像学资料共700例，以10年为一年龄段将其分为9组，分别记录各组中重叠影像和金属物伪影的数量及种类，计算百分比并比较各组间的差异。结果1～10岁组中，重叠影像的比率为25％，21～30岁组该比率迅速降至4．2％，随后缓慢增高，于80岁以上组达到20％；伪影的比率则随年龄由0（1～10岁组）逐渐增至90％（i〉81岁组）。结论年龄及口内各种金属物是影响CBCT影像清晰度的重要因素，在行CBCT检查前对影响因素给予高度重视及适当处理将提高影像清晰率。

Objective To evaluate the definition of images of cone beam computed tomography( CBCT)and to provide the reference for methods of clinical examination. Methods The imaging data of 700 patients treated in the department of Stomatology in Friendship Hospital dur-ing 2014 were selected and reviewed. They were divided into 9 groups with the age range of every ten years and the number of overlapped images and metal artifacts were studied respectively,and their difference had been compared. Results The rate of overlapped images had been rapidly declined from 25%(age group 1~10 yrs)to 4. 2%(age group 21~ -30 yrs),and then slowly increased to 20%(age group over 81yrs). The rate of metal artifacts increased from 0( age group 1~10 yrs)to 90%( age group over 81 yrs). Conclusion Age and intraoral metallic material are important factors influencing the definition of images. For those above-mentioned patients,better definition of images can be achieved,if high attention has been paid to these influential factors with some appropriate intervention before CBCT examination.