What is the TI-RADS Score Calculator?
The Thyroid Imaging Reporting and Data System (TI-RADS), published by the American College of Radiology (ACR), is a standardized way to stratify the malignancy risk of a thyroid nodule seen on ultrasound. This calculator turns five ultrasound feature categories into a single point total and a TR1-TR5 category, giving a reproducible, evidence-based risk level.
How to use it
Select the option that best matches the nodule for each of the five feature groups: composition, echogenicity, shape, and margin are single-choice, while echogenic foci is additive because more than one type of focus can be present. The calculator sums the points and assigns the category. The main formula is:
where C = composition, E = echogenicity, S = shape, M = margin, and F = the sum of all echogenic foci points.
How the points are assigned
Composition ranges from 0 (cystic or spongiform) to 2 (solid). Echogenicity ranges from 0 (anechoic) to 3 (very hypoechoic). A taller-than-wide shape adds 3, lobulated or irregular margins add 2, and extra-thyroidal extension adds 3. Foci add 1 for macrocalcifications, 2 for peripheral calcifications, and 3 for punctate echogenic foci.
Worked example
Consider a solid nodule that is very hypoechoic, taller-than-wide, with irregular margins and punctate echogenic foci:
A total of 13 points is well above the 7-point threshold, so the nodule is classified as TR5, highly suspicious, and fine-needle aspiration (FNA) is recommended for nodules ≥ 1 cm.
使用注意事項與精準校對原則（6 大核心守則）
📐 1. 嚴格對齊輸入量綱與單位
輸入各項數值時請務必確認量綱（例如小時、天數、金額、百分比），避免單位不匹配引發推算偏差。
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🔄 5. 多情景敏感度動態對比
建議針對極端值與多組預期情景分別試算，觀察輸出數據的波動區間，輔助做出更穩健的決策。
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