3[2]Naidich DP. Marshall CH, Gribbin C , et al . Low - dose CT of the lungs: preliminary observations. Radiology, 1990,175: 729- 731
4[3]Kaneko M, Eguchi K, Ohmatsu Hi et al. peripheral lung cancer:screening and detection with low - dose spiral CT versus radiography. Radiology , 1996, 201: 798 - 802
5[4]Nitta N, Takahashi M, Murata K, et al . Ultra low- dose helical CT of the chest . AJR, 1998, 171: 383 - 385
6[5]Rusinek, H, Naidich, D. P, Mc Guinness, G, et al: pulmonary nodule detection: Low- dose Versus conventional CT. Radiology,1998, 209: 243- 249
7[1]GE Medical Systems.LightSpeed Qxi General Service Manual.2001: 534- 538.
