A 3-D X-ray imaging system that eliminates the rotation process associated with tomographic systems is introduced. The system relies on measuring the intensity of Compton scattered radiation in two directions mutually perpendicular to an incident beam that rectilinearly scans the object. These measurements, along with transmission measurements obtained from one-side exposure of the object are utilized to reconstruct 3-D images of three physical parameters: two attenuation coefficients corresponding to the incident and scattered energies, and the electron-density in each voxel. This part of the paper addresses the theoretical and physical aspects associated with the image reconstruction process, and presents examples of images reconstructed from experimental results.Index Terms-3-D imaging, Compton scattering, image reconstruction, X-ray imaging.

The design aspects of a 3-D X-ray imaging system that eliminates the rotation process associated with tomographic systems are discussed. The processes of selecting the proper X-ray voltage and the beam configuration are addressed. A rectilinear scanning mechanism is introduced. The choice and design of detector assemblies are described. The paper presents the results of experiments devised to progressively test the performance and response of the system.

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