张口位扫描在口腔金属植入物患者CT检查中减少伪影的应用价值  

Value of open-mouth scanning for artifact reduction in CT scanning of patients with metallic oral implants

作　　者：赵冬冬 谢佳芮 邓灵波 张辉[1] ZHAO Dongdong;XIE Jiarui;DENG Lingbo;ZHANG Hui(Department of Medical Imaging,Peking University Shenzhen Hospital,Shenzhen 518036,China)

机构地区：[1]北京大学深圳医院医学影像科,广东深圳518036

出　　处：《中国医学物理学杂志》2025年第3期356-359,共4页Chinese Journal of Medical Physics

基　　金：广东省卫生信息网络协会科研项目(MZ-202408-0002)。

摘　　要：目的:探讨张口位CT扫描在减少口腔伪影的优势和临床价值。方法:选取口腔颌面部占位且存在金属义齿等51例患者纳入本研究。患者均先行常规CT平扫,后令患者张口,放置口含器,再行CT增强扫描。选取舌、上颚、牙龈等伪影相关层面并划定感兴趣区,计算两组图像伪影指数(AI)。通过AI比较常规与张口位扫描图像的伪影情况;并由两名高年资医生对两组图像伪影情况进行主观评分,评价两种检查方式的优劣。结果:所有患者均正常完成检查,张口组各区域AI均小于常规组(P<0.001)。张口组CT扫描图像的主观评分高于闭口组(P<0.001)。51例患者中有38例病变区域伪影减轻,有12例病变区域与金属伪影层面错开,病变显示清晰,对比度良好,图像效果最佳。结论:口腔占位患者行CT扫描时采用张口位能有效减少伪影,提升图像质量。Objective To explore the advantages and clinical potential of open-mouth CT scanning in reducing oral artifacts.Methods Fifty-one patients with oral and maxillofacial space-occupying lesions and wearing metallic dentures were enrolled.All of them underwent routine CT scan fist and then enhanced CT scan following insertion of a bite block into the mouth.The related slice of artifacts such as tongue,palate and gum were selected,and in which the region of interest was delineated.The advantages and disadvantages of conventional closed-mouth scanning and open-mouth scanning were discussed by calculating artifact indexes and subjectively scoring the image quality by senior doctors.Results Scanning was successfully performed in all patients.Compared with closed-mouth group,open-mouth group had smaller artifact index(P<0.001) and higher subjective score(P<0.001).The artifacts in the lesion area were reduced in 38 out of 51 cases,and the lesion area was staggered from the metallic artifact level in 12 cases.The open-mouth scanning showed the lesion clearly,with high contrast and the best image quality.Conclusion The open-mouth position can effectively reduce artifacts in CT scanning of patients with space-occupying lesions in the oral,and improve image quality.

关 键 词：张口位 口腔CT 金属伪影 伪影指数 

分 类 号：R816.98[医药卫生—放射医学]