The conventional X-ray imaging technique often provides poor contrast for many materials in biological samples. Phase contrast imaging approaches are suitable alternatives over the conventional computed tomography. The aim of this project is to demonstrate iterative methods to extract simultaneously phase and amplitude from the images taken along different directions of a homogeneous sample. One of the advantages of this imaging technique is having simple physical setup and showing significant contrast for homogeneous materials as shown in the figure. This figure demonstrates the microstructure of a wood which has been discovered by this method. The potential impact of such work could be quite significant; in case of success, it would be immediately incorporated in the data processing pipeline of the TOMCAT beamline at the Swiss Light Source (Paul Scherrer Institute).