USING THE AMERICAN COLLEGE OF RADIOLOGY THYROID IMAGING REPORTING AND DATA SYSTEM AT THE POINT OF CARE: SONOGRAPHER PERFORMANCE AND INTEROBSERVER VARIABILITY

The purpose of this study was to assess inter-observer variability and performance when sonographers assign features to thyroid nodules on ultrasound using the American College of Radiology (ACR) Thyroid Imaging Reporting and Data System (TI-RADS). Fifteen sonographers retrospectively evaluated 100 thyroid nodules and assigned features to each nodule according to ACR TI-RADS lexicon. Ratings were compared with one another and to a gold standard using Fleiss' and Cohen's kappa statistics, respectively. Sonographers were also asked subjective questions regarding their comfort level assessing each feature, and opinions were compared with performance using a mixed effects model. Sonographers demonstrated only slight agreement for margin (kappa = 0.18, 95% confidence interval [CI]: 0.16-0.20) and large comet tail artifact (kappa = 0.08, 95% CI: 0.06- 0.10) but better performance for macrocalcification (kappa = 0.41, 95% CI: 0.39-0.43) and no echogenic foci (kappa = 0.52, 95% CI: 0.50-0.54). Sonographer comfort level with different feature assignments did not statistically correlate with performance for a given feature. In conclusion, sonographers using ACR TI-RADS to assign thyroid nodule features on ultrasound demonstrate a range of agreement across features, with margin and large comet tail artifact showing the most variability. These results highlight potential areas of focus for sonographer education efforts as ACR TI-RADS continues to be implemented in radiology departments. (E-mail: benjamin.wildmantobriner@duke.edu) (c) 2020 World Federation for Ultrasound in Medicine & Biology. All rights reserved.