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目的:探讨鼻咽癌(nasopharyngealcarcinoma,NPC)的CT扫描技术。材料和方法:回顾性分析我院70例NPC鼻咽部CT扫描资料,其中59例平扫加增强扫描。扫描从上颌骨齿槽突向上扫至蝶鞍前床突水平,扫描基准线的设定分别采用:(1)听眦线(OML)56例;(2)听眶线(RBL)扫描5～6层后在颅底处改用听眉线(EML)5例;(3)EML或OML扫描2层后改用RBL扫描4～6层,之后再改用EML9例。打印胶片时,同时设定骨窗与软组织窗。结果:增强扫描59例中,54例明显增强(92%)。56例OML扫描对鼻咽顶后壁、后壁等层面壁值的测量稍有偏差的有23例。14例RBL扫描鼻咽顶后壁、后壁等层面,其影像结构能较真实反映的有13例,其中5例在扫描起始部选择RBL,口咽上部均不能显示。14例在颅底处改用EML同时显示3个颅底窝组织结构的有11例。结论:选用EML或OML扫描2层后改用RBL扫描4～6层,之后在颅底处再改用EML,以及正确应用增强扫描、薄层扫描、窗口等技术,能清晰地显示NPC及其周围组织的结构关系,达到精确诊断的目的。
Objective: To investigate the CT scanning technique of nasopharyngeal carcinoma (NPC). Materials and Methods: A retrospective analysis of 70 cases of NPC NPC nasopharyngeal CT scan data, including 59 cases of plain plus enhanced scan. Scanning from the maxillary alveolar ridge swept up to the level of the anterior sellae of the sellae, the scan baseline settings were used: (1) 56 cases of obliquity (OML); (2) auditory orbital (RBL) scan 5 ~ (EML) in 5 cases after the 6th floor; (3) EML or OML scans 2 layers and then uses RBL to scan 4 ~ 6 layers, then uses EML 9 cases. When printing film, set the bone window and soft tissue window at the same time. Results: Among the 59 cases, 54 cases were significantly enhanced (92%). 56 cases of OML scan on the nasopharyngeal posterior wall, posterior wall and other levels of wall thickness measurement of a slight deviation in 23 cases. Fourteen cases of RBL scan the nasopharyngeal posterior wall, posterior wall and other aspects of the image structure can be more realistically reflected in 13 cases, of which 5 cases at the beginning of the scan to select RBL, the oropharyngeal upper can not be displayed. Of the 14 patients who switched to EML at the base of the skull, 11 showed the structure of the skull base at the same time. Conclusion: After using EML or OML to scan 2 layers, RBL was used to scan 4 ~ 6 layers, and then reused EML at skull base, and the correct application of enhanced scanning, thin layer scanning, window and other techniques can clearly show NPC and its The structure of the surrounding tissue relationship, to achieve the purpose of accurate diagnosis.