Simulations of phase contrast synchrotron tomography images containing cracks with different sizes and shapes are obtained by using GATE software. 
GATE
Characterization of internal fatigue cracks in aluminum alloys by simulation of phase contrast tomography.Synchrotron Radiation Computed Tomography (SRCT) allows a better detection of fatigue cracks in metals than laboratory CT due to the existence of phase contrast.  Analyzing the simulation results, firstly, we confirmed that the bright parts with strong contrast in SRCT image are streak artifacts; secondly, we found that the gray scale values within the cracks in SRCT images are related to the crack size; these simulation results are used to analyse SRCT images of internal fatigue cracks in a cast Al alloy, providing a clearer visualisation of damage.
SRCT