Radiology Calculator Hub

Disclaimer

This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. All calculations must be confirmed by a qualified healthcare professional.

eGFR (CKD-EPI 2021) Calculator

Calculates estimated Glomerular Filtration Rate using the 2021 CKD-EPI Creatinine equation, which does not use a race variable. This is essential for assessing kidney function before administering IV contrast.

References:

1. Inker, L. A., Eneanya, N. D., et al. (2021). New Creatinine- and Cystatin C–Based Equations to Estimate GFR without Race. *New England Journal of Medicine*, 385(19), 1737-1749.

2. ACR Manual on Contrast Media (2024). American College of Radiology. Version 2024.

ACR TI-RADS (2017) Calculator

Calculates the TI-RADS score for a thyroid nodule based on 5 ultrasound categories to assess malignancy risk and guide management.

1. Composition

Cystic or almost completely cystic (0 pts) Spongiform (0 pts) Mixed cystic and solid (1 pt) Solid or almost completely solid (2 pts)

2. Echogenicity

Anechoic (0 pts) Hyperechoic or Isoechoic (1 pt) Hypoechoic (2 pts) Very Hypoechoic (3 pts)

3. Shape (Transverse)

Wider-than-tall (0 pts) Taller-than-wide (3 pts)

4. Margin

Smooth (0 pts) Ill-defined (0 pts) Lobulated or Irregular (2 pts) Extrathyroidal extension (3 pts)

5. Echogenic Foci

Select all that apply. The highest point value will be used.

None or Large comet-tail artifacts (0 pts) Macrocalcifications (1 pt) Peripheral (rim) calcifications (2 pts) Punctate echogenic foci (3 pts)

Reference:

Tessler, F. N., et al. (2017). ACR Thyroid Imaging, Reporting and Data System (TI-RADS): White Paper of the ACR TI-RADS Committee. *Journal of the American College of Radiology*, 14(5), 587-595.

Fleischner (2017) Solid Nodule

Provides follow-up recommendations for incidental, solid pulmonary nodules in patients aged 35+ based on the 2017 Fleischner Society guidelines.

Reference:

MacMahon, H., et al. (2017). Guidelines for Management of Incidental Pulmonary Nodules Detected on CT Scans: From the Fleischner Society 2017. *Radiology*, 284(1), 228-243.

PI-RADS v2.1 Calculator

Calculates the PI-RADS score for a prostate lesion based on location (PZ vs. TZ) and dominant sequence findings, as per the 2019 PI-RADS v2.1 guidelines.

1. Lesion Location

Reference:

Turkbey, B., et al. (2019). PI-RADS 2.1: 2019 Update of Prostate Imaging Reporting and Data System. *Radiology*, 291(2), 465-475.