Comparative Analysis of ACR TI-RADS and K-TIRADS: Inter-System Agreement and Diagnostic Performance Using a Single Study Cohort

Figures

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  Fig. 1. Diagram illustrating the inclusion of 481 thyroid US images.

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  Fig. 2. Web-based interface shows a grayscale US image on the left and an input panel on the right, where readers record individual US features and final K-TIRADS assessments, while ACR TI-RADS assessments were later calculated from these recorded features. ACR = American College of Radiology, K-TIRADS = Korean TI-RADS, TI-RADS = Thyroid Imaging Reporting and Data Systems

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  Fig. 3. US image shows a 7-mm nodule in the left thyroid lobe, lower isthmic portion, in a 49-year-old woman, which was confirmed as papillary thyroid carcinoma by fine-needle aspiration and subsequent surgery, with three readers assessing it as ACR TI-RADS and K-TIRADS 4 or 5, and one reader assessing it as ACR TI-RADS 2 and K-TIRADS 3, as summarized in the table. ACR = American College of Radiology, K-TIRADS = Korean TI-RADS, TI-RADS = Thyroid Imaging Reporting and Data Systems

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  Fig. 4. US image shows a 10-mm nodule in the right mid-lobe of the thyroid in a 43-year-old woman, which was confirmed as benign (Bethesda II) by fine-needle aspiration, with two readers assessing it as TI-RADS 2 or 3 and the other two readers assessing it as TI-RADS 4 or 5, as summarized in the table. ACR = American College of Radiology, K-TIRADS = Korean TI-RADS, TI-RADS = Thyroid Imaging Reporting and Data Systems