Abstract
Phase contrast tomography is a developing area in imaging. It isan extension of conventional tomography additionally employing phase information.However a strong coherence condition is needed for the measurement setup.Applications at synchrotron devices are being done since 1998 with convincing success.Devices for small laboratories are about to be implemented in near future. Inthis paper several models for phase contrast tomography are derived from the waveequation. Error estimates show...