🧲 DWI / ADC Calculator & Reference Values (with rADC)
UseQuantitative DWI reporting, research measurements and cross-scanner comparison.
SourceTurkbey B, et al. Eur Urol 2019;76:340-351
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
ADC = ln(S1/S2)/(b2 − b1).
When to use
Quantitative DWI reporting, research measurements and cross-scanner comparison.
How it works
ADC = ln(S_low/S_high)/(b_high − b_low); rADC = lesion ADC / reference ADC.
Key points
- ADC = ln(S1/S2)/(b2 − b1).
- Prostate 750–900 µm²/s.
- Breast ~1.30×10⁻³ mm²/s.
- Ischemic core <620 µm²/s.
References
- Turkbey B, et al. Eur Urol 2019;76:340-351
- Baltzer P, et al. Eur Radiol 2020;30:1436-1450
- Lansberg MG, et al. Lancet Neurol 2012;11:860-867
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Low b-value | 0 s/mm² |
|---|---|
| Signal at low b | 820 |
| High b-value | 800 s/mm² |
| Signal at high b | 310 |
| Or lesion ADC directly | 0.85 ×10⁻³ mm²/s |
| Organ | Prostate |
→ADC0.850×10⁻³ mm²/s
- ADC：0.850 ×10⁻³ mm²/s = 850 µm²/s (entered)
- Reference cue：750–900 µm²/s: suspicious range (PI-RADS scoring remains visual)
- Caveat：ADC depends on b-value pair, field strength, vendor and ROI placement; validate thresholds on local scanners.
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using DWI / ADC Calculator & Reference Values (with rADC)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- Does DWI / ADC Calculator & Reference Values (with rADC) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is DWI / ADC Calculator & Reference Values (with rADC) calculated in practice? Can you show a worked example?
- Inputs: Low b-value 0 s/mm², Signal at low b 820, High b-value 800 s/mm², Signal at high b 310, Or lesion ADC directly 0.85 ×10⁻³ mm²/s, Organ Prostate → Result: ADC 0.850 ×10⁻³ mm²/s（ADC: 0.850 ×10⁻³ mm²/s = 850 µm²/s (entered), Reference cue: 750–900 µm²/s: suspicious range (PI-RADS scoring remains visual), Caveat: ADC depends on b-value pair, field strength, vendor and ROI placement; validate thresholds on local scanners.）