ABSTRACT
The progress of the gemstone spectral CT was introduced in clinical application. Review was executed from the aspects of energy spectrum technique and clinical application. The clinical application of the gemstone spectral CT was discussed in monochromatic imaging, materials decomposition, spectral curve, effective atomic number and analysis tool of the energy spectrum technique as well as in its clinical application to head, neck, chest, abdomen, musculoskeletal system and etc. Gemstone spectral CT could implement multi-parameter imaging and data analysis with analysis platform and tools and facilitate the qualitative and location diagnoses as well as treatment planning of the diseases, and thus could be promoted for comprehensive diagnosis, differential diagnosis, location diagnosis, postoperative imaging of iatrogenic metal implants, angiography, analysis on stone composition and etc of the tumors.