摘要
目的探讨低剂量CT胸部扫描技术的临床应用价值。方法将100例患者随机分2组，各50例，均为男18例，女32例。身高1．60～1．78m，体重50～80kg。常规A组采用管电流90mAs，对照B组管电流70mAs。管电压均为120kV，两组胸部扫描的差异对比采用t检验进行比较。扫描图像质量由2名高年资诊断医师进行盲审。结果两组对比单次扫描剂量CTDI分别为6．84mGy、5．32mGy，降幅为23．3％。常规组的平均有效管球剂量、总管球剂量和放射容积剂量指数分别为（75．83±4．92）mAs、（2092±128．14）mAs和（5．77±0．42）mGy。低剂量组分别为（56．24±5．87）mAs、（1592±114．02）mAs和（4．29±0．69）mGy，两者差异有统计学意义（t=20．62，t=35．41，t=5．48，P〈0．05）。常规组的图像噪声为（11．4±2．97）HU，低剂量组为（14．22±3．39）HU，两者差异有统计学意义（t=6．71，P〈0．05）。结论低剂量胸部CT扫描技术可明显减少对患者的辐射剂量，且图像质量能满足临床诊断要求。
Objective To probe into the value of low dose chest CT in clinical application. Methods 100 cases are randomly classified into 2 groups. Each includes 18 males and 32 females. The height is between 1.60-1.78 m and the weight is between 50-80 kg. The tube current of regular group A is 90 mAs, and control group B is 70 mAs. The tube voltages are both 120 kV and the scanned images are compared by using t test and are supervised by 2 advanced doctors for blind peer review between the two groups. Results CTDI decreases by 23.3%, from 6.84 mGy to 5.32 mGy when the tube current changed from 90 mAs to 70 mAs. The average effective tube ball dose, total tube bail dose, and CT dose index volume are （75.83±4.92） mAs, （2092±128.14） mAs and （5.774-0.42） mGy in regular group A, and the data are （56.24±5.87） mAs, （1592±114.02） mAs and （4.29±0.69） mGy in low dose group. Both of them have statistical significance （t=20.62, t=-5.41, t=5.48,p 〈 0.05）. The image noises are （11.4±2.97） HU in standard group and （14.22±3.39） HU in low dose group, there is statistical significance is （ t=-6.71,p 〈 0.05 ）. Conclusion The low dose chest CT can remarkably reduce the radiation dose, and provide satisfactory images for diagnosis.
出处
《中国医疗设备》
2013年第1期159-161,57,共4页
China Medical Devices
