7Mac Mahon H, Li F, Engelmann R, et al. Dual energy subtraction and temporal subtraction chest radiography [ J ]. J Thorac Imaging, 2008,23 ( 2 ) :77 -85.
8Shkumat NA,Siewerdsen JH,Richard S,et al. Dual-energy imaging of the chest :optimization of image acquisition techniques for the 'bone- only' image[ J ]. Med Phys,2008,35(2) :629-632.
9He Q, He W, Wang K, et al. Effect of muhiscale processing in digital chest radiography on automated detection of lung nodule with a computer assistance system[ J]. J Digit Imaging,2008,21(4) :164-170.
10Gilkeson RC, Novak RD, Sachs P. Digital radiography with dual- energy subtraction: improved evaluation of cardiac calcification [ J]. Am J Roentgenol,2004,183 (5) : 1233-1238.