8GraserA,Johnson TR, Chandarana H, et al. Dual energy CT: preliminary observations and potential clinical applications in the abdomen[J].Eur Radiol,2009,19( 1 ): 13 -23.
9Takahashi N,Hartmanl RP, Vrtiskal TJ,et al Dual-energy CTiodine-subtraction virtual unenhanced technique to detect urinary stones in iodine-filled collecting system[J].a phantom study+A JR Am J Roentgenol,2008,190(5): 1169-1173.
10Carstensenhhe Hansen J. Stones in ureter[J].Acta Chirurgica Scandinavica,1973,(11):1797-1801.
