💊 I-131 Therapy Activity Helper (empiric bands + Marinelli)
I-131 therapy activity helper: empiric Graves/remnant bands + optional Marinelli.
Clinical takeaway
Educational only; individualize.
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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
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
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 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
| Mode | Marinelli estimate |
|---|---|
| Empiric band | Metastatic 100–200 mCi (teaching) |
| Gland/target mass | 40 g |
| Desired absorbed dose | 100 Gy |
| Uptake | 30 % |
| Effective half-life Teff | 5 d |
| Preferred unit | MBq |
→Marinelli A9669.3MBq
- µCi：261333
- mCi / MBq：261.33 / 9669.3
- inputs：40 g, 100 Gy, U=30%, Teff=5 d
Frequently asked questions
- What is I-131 Therapy Activity Helper (empiric bands + Marinelli)?
- I-131 therapy activity helper: empiric Graves/remnant bands + optional Marinelli.
- How is I-131 Therapy Activity Helper (empiric bands + Marinelli) calculated? What is the core formula?
- Empiric mCi bands; Marinelli A(µCi)=98×D(rad)×m/(U%×Teff).
- When is I-131 Therapy Activity Helper (empiric bands + Marinelli) used?
- Teaching and protocol cross-check — not a prescription.
- What are the key clinical points for I-131 Therapy Activity Helper (empiric bands + Marinelli)?
- Educational only; individualize.
- 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.
- 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 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） Inputs: Mode Marinelli estimate, Empiric band Metastatic 100–200 mCi (teaching), Gland/target mass 40 g, Desired absorbed dose 100 Gy, Uptake 30 %, Effective half-life Teff 5 d, Preferred unit MBq → Result: Marinelli A 9669.3 MBq（µCi: 261333, mCi / MBq: 261.33 / 9669.3, inputs: 40 g, 100 Gy, U=30%, Teff=5 d）
💬 Peer discussion
Licensed clinicians only — about this Tool · I-131 therapy activity
Do not share identifiable patient information (PHI). Discuss principles and workflow only — not a substitute for clinical judgement.
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