onographic techniques, including transvaginal sonography, have been proven effective in identifying disorders responsible for gynecologic emergencies. 1,2 In women presenting to emergency departments (EDs) because of symptoms in the first trimester of pregnancy, sonography is recommended as part of the initial workup. 3,4 According to a recent systematic review, the use of sonography in gynecologic EDs decreases the risk of missed ectopic pregnancy, time to surgery for ectopic pregnancy, and length of stay in patients with normal pregnancies and may be more cost-effective than diagnostic strategies requiring formal sonography. 5 Abbreviations ED, emergency department; Ob/Gyn, obstetrics and gynecology S ©2015 by the American Institute of Ultrasound in Medicine | J Ultrasound Med 2015; 34:829-835 | 0278-4297 | www.aium.org ORIGINAL RESEARCH Objectives-To assess the impact of an educational intervention based on an original accreditation training program on the quality of emergency sonography performed by obstetrics and gynecology (Ob/Gyn) residents. Methods-We conducted a prospective before-after study on residents who performed bedside standardized sonographic examinations as first-line investigations in patients seen at our gynecologic emergency department. In both periods, the residents followed a 1-hour class taught by a board-certified Ob/Gyn sonography expert (opinion leader) and received a written standardized imaging protocol. An accreditation training process was implemented for the new residents at the beginning of the second period: 5 complete sonographic examinations were required for each resident, and facilitated feedback from the opinion leader was performed using a dedicated sonographic quality score. During both periods, all consecutive sonograms were collected and stored. The primary outcome was the sonographic quality score. A mixed model for repeated measures was used to compare scores in both periods from 20 consecutive sonographic examinations performed by 5 residents who were different in each period. Results-The mixed model analysis showed an increase in quality scores in the post-accreditation training compared to the pre-accreditation training period (estimated coefficient ± SD, 4.13 ± 0.51; t = 8.16). The sonographic examination order also had a significant effect in both periods (estimated coefficient ± SD, 0.11 ± 0.03; t = 3.99). Conclusions-An accreditation training process including facilitated feedback from a local opinion leader improved the quality of sonographic examinations performed by Ob/Gyn residents in women presenting to a gynecologic emergency department.