Shima Aran MD, Presenter: Nothing to Disclose

Khalid Walid Shaqdan MD, Abstract Co-Author: Nothing to Disclose

Elmira Hassanzadeh MD, Abstract Co-Author: Nothing to Disclose

Efren Jesus Flores MD, Abstract Co-Author: Nothing to Disclose

Hani H. Abujudeh MD, MBA, Abstract Co-Author: Research Grant, Bracco Group Consultant, RCG HealthCare Consulting Author, Oxford University Press

Dual-energy CT (DECT) stands as the frontier imaging modality for metal artifact reduction as it provides significantly enhanced image acquisition with no additional radiation dose. Metal artifacts during polychromatic CT imaging are secondary to multiple physical phenomena such as beam hardening, photon starvation, scattered radiation and edge effects and excessive quantum noise. Monochromatic images are generated from projection-space data and are less susceptible to beam hardening artifacts. Availability of high photon energies in DECT reduced the issue of photon starvation and streak artifacts. The opportunity of scrolling through various extrapolated energy levels allows to find a suitable energy level which is high enough to overcome metal artifact, but not so high to make the surrounding soft tissue definition obscured. Optimal energy levels have generally been reported to be 110 to 140 keV. These unique advantages of DECT make it the imaging modality of choice for metal artifact reduction.

1. Basics of DECT on basis of photoelectric, Compton interactions and material decomposition. 2. Techniques of DECT acquisition 3. Image processing and reconstruction of DECT data. 4. Other available acquisition protocols for metal artifact reduction. 5. Clinical application of DECT for metal artifact reduction and sample cases.  

http://abstract.rsna.org/uploads/2014/14003638/14003638_jh1d.pdf

Aran, S, Shaqdan, K, Hassanzadeh, E, Flores, E, Abujudeh, H, Value of Dual-Energy Computed Tomography in Metal Artifact Reduction Using Energetic Extrapolation.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14003638.html