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目的 评价同层动态增强CT技术对3 cm以下肺腺癌和鳞癌的诊断价值。方法 选择直径<3 cm的肺腺癌22例和肺鳞癌9例,平扫后静脉注入对比剂行同层动态增强CT扫描,测量其增强前后各时间段的CT值改变,计算最大CT强化值,绘制其时间密度曲线。结果 肺腺癌在增强后135 s和195 s时间段的CT强化值大于鳞癌,二者有明显统计学差异(P<0.05),余各时间段无明显差别(P>0.05)。腺癌的时间密度曲线为缓慢持续上升型,鳞癌为抛物线型。肺腺癌与鳞癌的增强效果皆始于35 s,但鳞癌峰值时间早于腺癌,二者峰值大小无统计学差异(P>0.05)。结论 同层CT动态增强扫描技术,在区分肺腺癌与鳞癌组织学类型方面有一定价值。
Objective To evaluate the diagnostic value of the same layer of dynamic contrast-enhanced CT in lung adenocarcinoma and squamous cell carcinoma below 3 cm. Methods Twenty-two cases of lung adenocarcinoma with diameter less than 3 cm and 9 cases of squamous cell carcinoma of the lung were selected. The contrast-enhanced contrast agent was applied to the same layer of dynamic contrast-enhanced CT scan. The changes in CT values before and after the enhancement were measured. The maximum CT enhancement was calculated. Value, draw its time density curve. Results The enhancement value of lung adenocarcinoma in 135 s and 195 s after the enhancement was greater than that in squamous cell carcinoma. There was a significant difference between the two (P<0.05), and there was no significant difference in other time periods (P>0.05). The time-density curve of adenocarcinoma is a slowly rising type, and the squamous cell carcinoma is parabolic. The enhancement effect of lung adenocarcinoma and squamous cell carcinoma began at 35 s, but the peak time of squamous cell carcinoma was earlier than that of adenocarcinoma. There was no significant difference in the peak size of the two (P>0.05). Conclusion The dynamic contrast-enhanced scanning technique in the same layer has certain value in distinguishing the histological types of lung adenocarcinoma and squamous cell carcinoma.