Measurement and analysis of geometric effects on partial iso-centric x-ray tomosynthesis system

X-ray digital tomosynthesis based on plurality sets of projection data, within a restricted angular range, is capable of forming a cross-sectional image of 3D objects and providing acceptable resolution image but with lower radiation dose than computer tomography (CT). We are developing a tomosynthesis system based on an object rotating micro-CT system. This study is to evaluate the changes and to model the behaviors caused by projection angle variation of tomosynthesis geometry. The result proved that source-to-pixel distance plays an important role on image uniformity. Further studies to accomplish a well optimized tomosynthesis acquisition and system models to improve reconstructed image quality are on-going.