Introduction
The EOS imaging system is a biplane slot beam scanner capable of full body scans at low radiation dose and without geometrical distortion. It was implemented in our department primo 2012 and all scoliosis examinations are now performed in EOS. The system offers improved possibility to measure rotation of individual vertebrae and vertebral curves can be assessed in 3D. Leg length Discrepancy measurements are performed in one exposure without geometrical distortion and no stitching. Full body scans for sagittal balance are also performed with the equipment after spine surgery.
Purpose
The purpose of the study was to evaluate workflow defined as scheduled time pr. examination and radiation dose in scoliosis examinations in EOS compared to conventional x-ray evaluation.

Materials and Methods:
The Dose Area Product (DAP) was measured with a dosimeter and a comparison between conventional X-ray and EOS was made.
The Workflow in 2011 was compared to the workflow in 2013 with regards to the total number of examinations and the scheduled examination time for scoliosis examinations.

Results:
DAP for a scoliosis examination in conventional X-ray was 185 mGy*cm2 and 60.36 mGy*cm2 for EOS.
The scheduled time for scoliosis was 15 minutes in conventional X-ray which remained unchanged after implementation of EOS.
The number of scoliosis examinations has increased from 396 to 1.145 since the implementation.

Conclusion:
The radiation dose for a scoliosis examination in EOS can be reduced to approximately 30 % of the radiation dose in conventional X-ray.
The increased number of scoliosis examinations is related to increased referral and not due to optimized workflow.