Abstract
Objectives: To assess the impact of the Siemens Artis Q.zen on radiation dosage during patent ductus arteriosus (PDA) device closure. Theoretical dose reduction is purported to be delivered by the use of crystalline silicon detectors in combination with the Gigalix x-ray tube that uses flat emitter technology instead of filaments. Both of these allow good image quality at low dose. Methods: Case-control comparison of patients undergoing PDA device closure in two eras – July to October of 2014 in a Siemens Artis zee laboratory (group 1) versus February of 2015 (group 2) in the Siemens Artis Q.zen laboratory. All patients undergoing PDA closure by three operators were included for analysis. Results: Group 1 comprised 11 patients compared to 9 in group 2. Group 1 median age 1.3 years (range 0.6-7 years) and weight 11kg (range 4.8-26.7kg) versus group 2 age 2.6 years (range 0.7-13.3 years) and weight 14.7kg (range 7.6-49kg). Fluoroscopy time was similar in both groups: 6.75min vs 5.73min (ranges 4.2-20min vs 1.4-13.4min). DAP in group 1 was 142uGym2 (range 42-287) versus 64uGym2 (range 32-124) in group 2. Entry dose was 32mGy (range 8-67) in group 1 vs 9 (range 6-25) in group 2. Conclusion: Conversion to the Artis Q.zen laboratory has more than halved radiation dose in children undergoing PDA closure, without any other changes in operators or procedural practice.
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