Health

Adrenal CT Washout Calculator

Differentiate adrenal adenomas from malignant masses using CT washout.

Pre-contrast (HU)

Post-contrast (60s) (HU)

Delayed (15 min) (HU)

Absolute Washout—

Relative Washout—

Pre-contrast Assessment—

Interpretation—

Absolute Washout = (Post − Delayed) / (Post − Pre) × 100
Relative Washout = (Post − Delayed) / Post × 100
Adenoma: Absolute ≥ 60% OR Relative ≥ 40%
Pre-contrast ≤ 10 HU → lipid-rich adenoma