💊 I-131 Therapy Activity Helper (empiric bands + Marinelli)
UseTeaching and protocol cross-check — not a prescription.
SourceATA/EANM radioiodine therapy guidance; classic Marinelli constant 98
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
Educational only; individualize.
When to use
Teaching and protocol cross-check — not a prescription.
How it works
Empiric mCi bands; Marinelli A(µCi)=98×D(rad)×m/(U%×Teff).
Key points
- Educational only; individualize.
References
- ATA/EANM radioiodine therapy guidance; classic Marinelli constant 98
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.
| Mode | Empiric band |
|---|---|
| Empiric band | Graves high 15–20 mCi |
| Gland/target mass | 40 g |
| Desired absorbed dose | 100 Gy |
| Uptake | 30 % |
| Effective half-life Teff | 5 d |
| Preferred unit | mCi |
→mCi mid17.5mCi
- band：graves_high
- range mCi：15–20
- range MBq：555–740
| Mode | Empiric band |
|---|---|
| Empiric band | Graves low 5–10 mCi |
| Gland/target mass | 40 g |
| Desired absorbed dose | 100 Gy |
| Uptake | 30 % |
| Effective half-life Teff | 5 d |
| Preferred unit | mCi |
→mCi mid7.5mCi
- band：graves_low
- range mCi：5–10
- range MBq：185–370
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using I-131 Therapy Activity Helper (empiric bands + Marinelli)?
- 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 I-131 Therapy Activity Helper (empiric bands + Marinelli) 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 I-131 Therapy Activity Helper (empiric bands + Marinelli) calculated in practice? Can you show a worked example?
- Inputs: Mode Empiric band, Empiric band Graves high 15–20 mCi, Gland/target mass 40 g, Desired absorbed dose 100 Gy, Uptake 30 %, Effective half-life Teff 5 d, Preferred unit mCi → Result: mCi mid 17.5 mCi（band: graves_high, range mCi: 15–20, range MBq: 555–740） Inputs: Mode Empiric band, Empiric band Graves low 5–10 mCi, Gland/target mass 40 g, Desired absorbed dose 100 Gy, Uptake 30 %, Effective half-life Teff 5 d, Preferred unit mCi → Result: mCi mid 7.5 mCi（band: graves_low, range mCi: 5–10, range MBq: 185–370）