The objective of the proposal is to investigate the potential of a brand-new imaging technique, Spectral Photon Counting Computed Tomography or SPCCT (currently in development, to detect, characterize and monitor neurovascular and cardiovascular disease), for the visualization of injectable calcium phosphate cements (CPC) used in bone reconstruction surgery. Hence, combination of the contrast agents designed for SPCCT with CPC will be investigated to allow good visualization of the cement, while retaining suitable ergonomic, mechanical and biological properties for their practical use in bone surgery. Compared imaging results will be performed, to demonstrate that SPCCT provides unique advantages for the in vivo monitoring of the degradation of CPC implants, in comparison with other imaging techniques, in particular CT-scan. For that purpose, a preclinical animal model of spine fusion will be used, since the possibility to early detect fusion failures is a critical issue for this indication. The proposal will also investigate the potential of SPCCT to target and visualize the inflammatory process occurring during bone repair. Finally, the expected results might also open the way to the image-guided implantation of theses cements, via minimally invasive procedures.