Polychromatic X-ray in-line phase-contrast tomography for soft tissue Xue-jun Guo, Xiao-lin Liu, Mu Gu, Chen Ni, Shi-ming Huang and Bo Liu EPL, 98 1 (2012) 14001 Published online: 05 April 2012 DOI: 10.1209/0295-5075/98/14001