Our Research CT Scanners

The current CT system in the CT Clinical Innovation Center is a Siemens SOMATOM Definition FORCE, which was installed in 2014.


Collaboration with Siemens Healthcare began in 2004 with the installation of the first Siemens Sensation 64 CT system in the United States. Since 2004, three other first-of-their-kind CT systems have been installed in the center: a Definition Dual Source CT, installed in 2006, a Definition AS+, installed in 2008, and a Definition Flash, installed in 2009. Dual-source CT systems are equipped with two x-ray tubes.

The current CT system has a minimum gantry rotation time of 0.25 seconds, which allows a temporal resolution of 66 milliseconds. The system can also be used for dual-energy CT imaging, in which the two X-ray tubes are operated at different energies, with one X-ray source typically operating at low energy — 70 or 80kilovolts (kV) — and the other operating at high energy — 150 kV. A 0.6 m tin filter is used in the high-energy beam to harden the x-ray spectrum.

The use of different tube energies allows for the differentiation of materials that might otherwise look the same using traditional CT imaging techniques, such as iodine, calcium and uric acid.

Dual-energy CT techniques are used clinically for automated removal of bone or iodinated contrast material and for the visualization of perfused blood volume. In addition, dual-energy CT can be used to identify the composition of materials in the body, such as renal stone type or uric acid deposits in joints (gout).


Installed in 2014, Siemens Whole-Body, Photon Counting Detector (dual-source CT; prototype) is located in Mayo's research imaging facility.


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