Objective:To compare the radiation dose between two different collimations on chest low-dose screen and normal using a 16-slice spiral CT,in order to provide guideline for lung low-dose screen.Methods:100 physical examination objectors use 1.5 mm × 16(24 mm) collimation in lung low-dose screen of anomalous.Then use 0.75 mm × 16(12 mm) collimation to screen.They use KVP,Effective mAs,time of ration and image of thick were the same.120 kV,20 mAs,0.5 s/rotation,5 mm.To different overlap 50% reconstruct 2 mm an...
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