Interreader Concordance of the TI-RADS: Impact of Radiologist Experience

Area of Science:

• Radiology
• Medical Imaging
• Endocrinology

Background:

• Accurate characterization of thyroid nodules is crucial for patient management.
• The American College of Radiology Thyroid Imaging Reporting and Data System (TI-RADS) provides a standardized lexicon for thyroid nodule assessment.
• Understanding radiologist concordance and the influence of experience is vital for consistent application of TI-RADS.

Purpose of the Study:

• To evaluate interreader agreement among radiologists when characterizing thyroid nodules using TI-RADS.
• To investigate the effect of radiologist experience on concordance in TI-RADS assessments.

Main Methods:

• Six radiologists (three experienced, three less experienced) assessed 150 thyroid nodules.
• Nodules were characterized using the TI-RADS lexicon, and percent concordance was calculated for various categories and features.
• Statistical analysis compared concordance rates between experienced and less experienced reader groups.

Main Results:

• Interreader concordance varied across TI-RADS categories (e.g., shape 87.2%, composition 81.2%) and individual features.
• Less experienced radiologists demonstrated significantly higher concordance for margins, echogenic foci, comet tail artifact, and punctate echogenic foci.
• Concordance for the overall TI-RADS level (50.4%) and fine-needle aspiration (FNA) recommendation (78.9%) was moderate and unaffected by experience.

Conclusions:

• Moderate interreader agreement exists for many TI-RADS categories and features.
• Less experienced readers showed higher concordance, potentially due to stricter adherence to explicit TI-RADS criteria.
• The TI-RADS lexicon demonstrates robustness, with overall assessments and FNA recommendations remaining consistent across experience levels.