Timothy Peter Szczykutowicz PhD, Presenter: Equipment support, General Electric Company Research Grant, Siemens AG

Sebastian Schafer, Abstract Co-Author: Consultant, Siemens AG

Kevin Royalty MS, MBA, Abstract Co-Author: Employee, Siemens AG

Sara Rademacher Nace MD, Abstract Co-Author: Nothing to Disclose

Tabassum A. Kennedy MD, Abstract Co-Author: Nothing to Disclose

(1) While producing similar tomographic images, there exist geometric and technological differences between MDCT and c-arm CT (CACT). (2) Target collimated imaging modes available on some CACT systems allow for smaller irradiated volumes compared to MDCT (3) The reduced scan angular range and smaller irradiated volume modes achievable with CACT can be exploited to reduce the eye lens dose in temporal bone imaging by several hundred percent relative to MDCT.

This education exhibit will provide an overview of the components of MDCT and CACT systems that define the volume to be irradiated in order to obtain volumetric images. Temporal bone imaging will be used to demonstrate how scan acquisition differences between MDCT and CACT result in differences in the incident fluence radiation dose distribution. The difference in the eye lens dose between MDCT and CACT will be presented using results measured with thermo-luminescent dosimeters. Volumetric dose maps will also be shown to allow the clinician to visualize the dose distribution differences between MDCT, full field CACT and volume of interest CACT. The clinician should be able to walk away from this exhibit and easily communicate to their colleagues why eye lens and integral dose reductions are possible when target collimation modes of CACT are used in place of MDCT.

http://abstract.rsna.org/uploads/2014/14004966/14004966_tkmt.pdf

Szczykutowicz, T, Schafer, S, Royalty, K, Nace, S, Kennedy, T, Understanding the Differences in Radiation Dose Distribution between Multi Detector CT and C-arm CT for High Contrast Imaging.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14004966.html