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Medical ImagingGenerated accuracy model review: 2026-05-06

Adrenal Washout accuracy and testing

This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.

Formula source

  • * **Relative Washout:** (Enhanced - Delayed) / Enhanced * **Absolute Washout:** (Enhanced - Delayed) / (Enhanced - Pre-Contrast) Adenomas wash out contrast faster than metastases or pheochromocytomas.

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

  • Pre-Contrast (Unenhanced): 25 HU
  • Enhanced (Venous): 120 HU
  • Delayed (15-min): 45 HU

Expected outputs

  • Absolute Washout: 78.90%
  • Relative Washout: 62.50%
  • Interpretation: Likely Adenoma (Absolute > 60%)

Known limitations

  • This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
  • Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

  • The formula assumes attenuation values come from a comparable ROI placement across phases.
  • The output is a characterization aid and does not replace the full imaging appearance, growth history, or endocrine workup.
  • Thresholds vary by protocol timing and institutional practice, so this tool should not be treated as a stand-alone diagnosis.

Unit handling

  • Pre-Contrast (Unenhanced) accepts values in HU.
  • Enhanced (Venous) accepts values in HU.
  • Delayed (15-min) accepts values in HU.
  • Absolute Washout is displayed as a percentage.
  • Relative Washout is displayed as a percentage.

Rounding rules

  • Number displays use up to 2 decimal places in the calculator UI.
  • Percent outputs are displayed with two decimal places.

Version history

1.0.0 - 2026-05-06

Generated accuracy and testing page from the current adrenal-washout-calculator calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for Adrenal Washout.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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