Application Analysis of Low Dose Chest CT scan

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 ball dose,and CT dose index volume are(75.83±4.92) mAs,(2092±128.14) mAs and(5.77±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=35.41,t=5.48,p0.05).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,p0.05).Conclusion The low dose chest CT can remarkably reduce the radiation dose,and provide satisfactory images for diagnosis.