摘要
目的:评价肺部不同扫描参数下的辐射剂量和图像质量,探讨低剂量扫描在CT引导下肺部穿刺活检中的应用价值.方法:①CT引导下肺部穿刺活检的患者30例(肺穿组),扫描参数为10 mA,120 kV,层厚5 mm,螺距1.5,床速15 mm/s;30例患者(对照组)行胸部常规智能自动毫安扫描,参数为30～175 mA,平均(82.0±13.5)mA,120 kV,层厚10 mm,螺距1.5,床速30 mm/s;②分别比较两种扫描参数下的CT权重剂量指数(CTDIw)和剂量长度乘积(DLP)、图像质量及总扫描帧数.结果:30例肺穿患者在10 mA低剂量扫描参数下全部穿刺成功.肺穿组的CTDIw和DLP分别为(15.9±8.4)mGy和(2.9±2.3)Gy·cm,明显低于对照组(P＜0.01).结论:采用10 mA低剂量扫描参数,不仅可以保证CT引导下肺部穿刺活检成功,而且能减少患者的受线量.
Objective：To compare the radiation dose and the quality of images in different CT scan parameters of the thorax, and to evaluate the application of low dose scanning in CT guided puncture biopsy of the lung. Methods： ① 30 patients underwent CT-guided puncture biopsies of the lung with low dose （120 kV,10 mA） CT scanning. Auto low dose scanning was performed in 30 patients （control group）. ②Weighted CT dose index （CTDIw）, dose length product （DLP） and image quality produced by each scanning protocol were compared respectively. Results： Pathologic results were available in 30 patients with CT-guided puncture biopsies. CTDIw and DLP were （2.9±2.3） mGy and （15.89±8.4） mGy·cm respectively, which were far lower than those of the auto low dose scanning protocol. The puncture needle can be clearly shown in the lower scanning protocol, and the operation can be successfully performed. Conclusion： Lower dose scanning can be used not only to ensure the success of CT-guided puncture biopsies of the lung and also to lessen the amount of radiation the patients receive.
出处
《放射学实践》
2005年第12期1075-1077,共3页
Radiologic Practice
