Technical Specifications:

GE Revolution HD GSI

• Gemstone Spectyral Imaging (140 kV and 80 kV fast switching)
• VEO for ultra low dose image reconstruction

Use: 

• 3D modelling using low dose protocol
• Material decomposition, e.g. uric acid in gout

Want to know what the Dual Energy CT/GSI can be used for?  Some of these papers are excellent examples: 

Lin XZ, Miao F, Li JY, Dong HP, Shen Y, Chen KM. "High-Definition CT Gemstone Spectral Imaging of the Brain: Initial Results of Selecting Optimal Monochromatic Image for Beam-Hardening Artifacts and Image Noise Reduction." J Comput Assist Tomogr. 2011 Mar-Apr;35(2):294-7.

Lee YH, Park KK, Song HT, Kim S, Suh JS. "Metal artifact reduction(MAR) in gemstone spectral imaging dual-energy CT with and without metal artifact reduction software." Eur Radiol. 2012 Jun;22(6):1331-40.

Liguori C, Frauenfelder G, Massaroni C, et al. "Emerging clinical applications of computed tomography." Medical Devices (Auckland, NZ). 2015;8:265-278.

Graser, A., Johnson, T.R.C., Chandarana, H. et al. "Dual energy CT: preliminary observations and potential clinical applications in the abdomen." Eur Radiol (2009) 19: 13.

CT Angiography

Roberts WT, Bax JJ, Davies LC. "Cardiac CT and CT coronary angiography: technology and application." Heart.  2008;94:781-792.