两种锥形束CT金属伪影的定量研究  

Phantom quantitative study on metal artifacts in two different cone beam CT

作　　者：周洋[1] 刘红红[1] 张志宏[1] 司俊锋 朱元君 张震东[1] 周航天[1] 

机构地区：[1]安徽医科大学附属省立医院口腔医学中心,合肥230001 [2]合肥美亚光电技术股份有限公司,合肥230088

出　　处：《安徽医科大学学报》2017年第8期1247-1250,共4页Acta Universitatis Medicinalis Anhui

基　　金：安徽省科技计划项目(编号:1301041026)

摘　　要：提供一种定量评价金属伪影的方法 ,并以此比较两种锥形束CT金属伪影面积的差异。在石膏底座模型上标记出前牙区、前磨牙区、磨牙区的位点,灌注超硬石膏模型,并在前牙区和前磨牙区放置直径3.3 mm纯钛柱,磨牙区放置直径4.1 mm和4.8 mm纯钛柱,每个模型放置一颗钛柱,共计32个模型。分别用两台不同品牌的锥形束CT在相同的外部条件下扫描上述模型,用Matlab软件测量同一截面下伪影的面积并比较分析。结果显示两锥形束CT都产生了环状和放射条纹状伪影,采用脉冲放射模式的锥形束CT较采用连续放射模式的锥形束CT产生的伪影面积大,差异有统计学意义(P<0.05)。在外界条件(管电流、管电压、分辨率等级)相同的情况下,不同锥形束CT产生金属伪影的程度差异有统计学意义(P<0.05)。To quantitatively evaluate the artifacts appearance of different cone beam computed tomography. The anterior region, premolar area, molar region were marked on the plaster models. 3. 3 mm diameter titanium cylin-der into anterior region,4. 1 mm and 4. 8 mm diameter titanium cylinder were placed into molar region. One titani-um cylinder was plased in each model. Models were scanned by CBCT under the same external conditions and meas-ured with Matlab software then analyzed the results. Two cone-beam CTs had the ring artifacts and scattering arti-facts. The difference was considered statistically significant （P 〈0. 05） . This showed that cone-beam CT would pro-duce different artifacts if it has different internal exposure conditions （P 〈0. 05）.

关 键 词：锥束计算机体层摄影技术 伪影 牙种植体 

分 类 号：R816.98[医药卫生—放射医学]