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-《中国医学物理学杂志》

文章信息/Info

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

Author(s):: ZHAO Dongdong; XIE Jiarui; DENG Lingbo; ZHANG Hui; Department of Medical Imaging, Peking University Shenzhen Hospital, Shenzhen 518036, China

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。

Abstract:: 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.