Calculators
Radiology calculators for the report
Four calculations that come up in the middle of a report, each with the formula, the threshold with its source and the line ready to copy. The logic is the same as in the RadCommons public tool.
- Adrenal washoutCalculate the absolute and relative washout of an adrenal nodule on CT and see the interpretation by the ACR 2017 thresholds, with the line ready for the report.
- Ellipsoid volumeCalculate the volume of a nodule, cyst, lymph node or organ from the three orthogonal axes with the ellipsoid formula, and copy the measurement ready for the report.
- PSA densityCalculate PSA density from the PSA and the prostate volume, or from the three axes of the prostate, and copy the line ready for the report.
- Volume doubling timeCalculate the volume doubling time of a nodule between two exams, by volumetry or by mean diameter, with the NELSON and BTS 2015 reference ranges.
Calculation support for physicians. The result does not replace the assessment of the exam or the decision of whoever signs the report. Page published on .
Classifications with a calculator
Questions and answers
How is absolute adrenal washout calculated?
Absolute washout = 100 × (portal venous phase attenuation − delayed phase attenuation) ÷ (portal venous phase attenuation − unenhanced attenuation), with the three attenuation values in HU and the delayed phase at 15 minutes.
What is the ellipsoid volume formula?
Volume = axis 1 × axis 2 × axis 3 × π/6. The three axes are orthogonal to each other and in the same unit.
How is PSA density calculated?
Divide the serum PSA, in ng/mL, by the prostate volume, in cm³. A PSA of 6.2 ng/mL with a prostate of 47.2 cm³ gives a density of 0.13 ng/mL/cm³.
How is volume doubling time calculated?
VDT = interval between the exams, in days, × ln 2 ÷ ln(V2 ÷ V1), where V1 is the prior volume and V2 the current one. A nodule that went from 120 to 180 mm³ in 90 days has a VDT of 154 days.
Source
Mayo-Smith WW et al. Management of Incidental Adrenal Masses: A White Paper of the ACR Incidental Findings Committee. JACR 2017;14(8):1038-1044. DOI 10.1016/j.jacr.2017.05.001
Turkbey B et al. Prostate Imaging Reporting and Data System Version 2.1. Eur Urol 2019. DOI 10.1016/j.eururo.2019.02.033
VDT = interval x ln 2 / ln(V2/V1) (Schwartz, 1961). Reference ranges: NELSON (VDT < 400 days positive; 400 to 600, indeterminate) and BTS 2015 (discharge only with VDT > 600 days by volumetry).
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