2Boridy IC,Nikolaidis P,Kawashima A.Ureterolithiasis:value of the tail sign in differentiating phleboliths from ureteral calculi at nonenhanced helical ct[J].Radiology,1999,211(3):619~621
3Knoepfle E,Hamm M,Wartenberg S,et al.CT in ureterolithiasis with a radiation dose equal to intravenous urography:results in 209 patients[J].Rofo,2003,175 (12):1667~1672
4Heneghan JP,McGuire KA,Leder RA.Helical ct for nephrolithiasis and ureterolithiasis:comparison of conventional and reduced radiation-dose techniques[J].Radiology,2003,229(2):575~580
5Liu W,Esler SJ,Kenny BJ.Low-dose nonenhanced helical CT of renal colic:assessment of ureteric stone detection and measurement of effective eose equivalent[J].Radiology,2000,215(1):51~54
6Kobayashi T,Nishizawa K,Watanabe J.Clinical characteristics of ureteral calculi detected by nonenhanced computerized tomography after unclear results of plain radiography and ultrasonography[J].J Urol,2003,170(3):799~802