OBJECTIVES: : To compare the time and motion of prefilled syringes with syringes filled from bottles during CT scan examinations and consequences on productivity of radiology wards METHODS: : We performed a time and motion study comparing Optiray™ Ioversol (in a pre-filled syringe) and syringes filled from bottles during CT scan examinations in 15 centres from 7 European countries. This study focused on the tasks of preparing the injection and injector and discarding the supplies. Measurements of engineered time standards were computed through EASE software using the Methods Time Measurment-1 and MTM-2 standard of work measurements [[1]]. RESULTS: : Eighty-nine analyzed observations of 173 were performed with Optiray. The average time to perform the injection was calculated at 162 s for pre-filled syringes vs. 214 for bottles in exams using a dual head injector and at 64 s for pre-filled syringes vs. 116 s for Vials in exams using a single head injector. The time benefit was calculated as 52 seconds decreasing the time spent for injection preparation by 35%. There was a low variability in our findings with a range from 45 to 135 s of benefit for with-saline exams and from 48 to 57 seconds for without-saline exams. Based on these calculations the time efficiency benefit could lead to an increase of 102 exams performed per year in a department performing 2 CT scans per hour, up to 407 additional exams per year for a room with 4 CT scans per hour. CONCLUSIONS: : The improvement provided by pre-filled syringes, could lead to an increase in productivity that could equate to a decrease in waiting lists. [1] MTM Association for standards and research http://www.mtm.org/index.html