[1] [1] GIJBELS I,LAMBERT A,QIU P H.Edge-preserving image denoising and estimation of discontinuous surfaces［J］.IEEE Transactions on Pattern Analysis and Machine Intelligence,2006,28(7):1075-1087.

[2] [2] TSUJII O,FREEDMAN M,MUN S.Automated segmentation of anatomic regions in chest radiographs using an adaptive-sized hybrid neural network［J］.Med Phys,1998,25(6):998-1007.

[3] [3] KALENDER W A,FICHTE H,BAUTZ W,et al.Semiautomatic evaluation procedures for quantitative CT of the lung［J］.Computer Assist Tomography,1991,15(2):248-255.