ULD-E (Ultra Low Dose Extremities)

extremity trauma is a frequent reason for emergency room visits. There is an increase in the use of CT scanners in extremity trauma, due to a greater sensitivity of detection than X-rays, particularly for "occult fractures" and for the organization of treatment, particularly surgical treatment. As the number of CT scans increases, the reduction of the delivered dose has become a subject of interest. Among the many methods used, the use of iterative reconstruction has enabled a substantial reduction in the delivered dose without compromising image quality: low-dose and ultra-low-dose protocols (effective dose equivalent to the effective dose of the Diagnostic Reference Levels of radiographs from the same region of interest) have been developped, but have not yet been evaluated in extremity trauma. The subject of our feasibility study is to evaluate the diagnostic performance of ultra-low dose CT compared to radiographs in patients consulting for extremity trauma in the emergency room. The recent implementation in our department of a scanner dedicated to low-dose explorations as well as the optimization of protocols has allowed the realization of ultra-low-dose scans since June 2017.