Objective To investigate the value of multi -slice spiral CT phase scan and post -processing techniques in diag-nosis of early glottic carcinoma .Methods A retrospective analysis was conducted on 29 patients with glottic carcinoma at tis , T1N0M0, and T2N0M0 stage, who were confirmed by pathology , with complete preoperative CT and postoperative pathological data.The CT values of tumor and vocal fold on plain scan , arterial phase, parenchymal phase enhanced scanning were measured and compared their differences .In combination with the original image and workstation processing image , the tumor location dis-tribution and edge in plain scan , arterial phase and parenchymal phase were observed .Results Early glottic carcinoma located in the anterior portion of the vocal folds in 13 cases, which were involved in the anterior joint in 3 cases, located in front of vocal cords in 9 cases, located at the rear in 5 cases, located in diffuse segment in 2 cases.The plain CT value in tumor and vocal cords flat had no significant difference ( P =0.2316), the tumor was shown a marked contrast enhancement , but, in arterial phase and parenchymal phase, CT value had no significant difference ( P =0.4264).The enhanced CT image of tumor margin in arterial phase was better than that in parenchymal phase .Conclusion For early glottic laryngeal carcinoma , multi-slice spiral CT scan can directly enhance the scanning , and only arterial phase CT scan can clearly show the tumor invasion and the scope for the as -sessment of tumor stage as well as reduce the effective radiation dose received by the patient .%目的：探讨多层螺旋CT不同期相扫描及后处理技术对早期声门型喉癌的诊断价值。方法对经病理证实的具有完整术前CT和术后病理资料的29例声门型喉癌Tis、T1N0M0、T2N0M0期进行回顾性分析。分别测量肿瘤及声带平扫、动脉期、实质期强化CT值，并比较其差异性；结合原始图像及工作站后处理图像观察肿瘤位置分布情况及边缘在平扫、动脉期及实质期的情况。结果声门区早期喉癌位于声带前部13例，其中累计前联合3例，位于声带中前部9例，位于后部5例，弥漫分部2例，肿瘤与声带相比平扫CT值无显著性差异， P值＝0．2316，肿瘤强化明显，但是动脉期与实质期CT值无显著性差异P值＝0．4264。动脉期强化幅度较实质期略高，观察肿瘤边界动脉期优于实质期。结论多层螺旋CT可直接增强扫描，且只扫描动脉期，既能清晰显示肿瘤侵及范围，判断肿瘤分期又能减少患者接收的有效放射剂量。
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