Tomographic femtosecond X-ray diffractive imaging
  A method is proposed for obtaining three simultaneous projections of a target from a single radiation pulse, which also allows the relative orientation of successive targets to be determined. The method has application to femtosecond X-ray diffraction, and does not require solution of the phase problem. We show that the principle axes of a compact charge-density distribution can be obtained from projections of its autocorrelation function, which is directly accessible in diffraction experiments. The results may have more general application to time resolved tomographic pump-probe experiments and time-series imaging. 
K.E. Schmidt, J.C.H. Spence, U. Weierstall, R. Kirian, X. Wang, D.   Starodub, H.N. Chapman, M.R. Howells, and R.B. Doak