
Local treatment of bone loss with an injection of resorbable, calcium‐based implant material to replace bone has a long history of clinical use. The in vivo discrimination of changes in bone versus implant is challenging with standard computed tomography (CT). However, spectral‐CT techniques distinguish tissues of similar densities but different chemical compositions. Therefore, dual-layer spectral‐CT imaging and postprocessing analysis methods were applied to investigate the separability of AGN1 (a triphasic calcium‐based implant) and bone after AGN1 injection in n = 10 male cadaveric femurs ex vivo. Spectral‐CT permits better discrimination of calcium‐based implants from bone ex vivo. The results warrant spectral-CT application in patients undergoing procedures with similar implants.
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