SIRT Dosimetry — Spectrum Interventional Radiology

SIRT / TARE Dosimetry Calculator

Y-90 radioembolisation — MIRD (mono-compartment), BSA, and Partition models for HCC and liver metastases.

⚠ NOT FOR CLINICAL USE. This tool is an independent estimate for personal cross-checking and record-keeping only. It must not be used to determine, verify, or alter patient treatment. Always rely on validated, calibrated clinical dosimetry software and local governance.

Patient (optional)

Initials

MRN

Age

Sex

Height / Weight cm / kg (for BSA)

Volumes & Physiology

Total liver volume cc

Treatment area volume cc (perfused)

Tumour in treatment area cc

Future liver remnant computed · red < 30%

—

T:N ratio set 1 if unknown

Lung volume cc

Lung shunt %

Advanced assumptions

Liver density g/cc

Lung mass override kg (blank = volume×density)

Dose constant: 49.67 Gy·kg/GBq (Y-90, full decay). Mass = volume × density.

Microspheres & FLEX

Product

FLEX day vs calibration (0 = cal day)

Prescribed Activity

1.50 GBq

02.557.510 GBq

Estimated microspheres — million

Calculated Doses

MIRD — mono-compartment whole perfused volume

Treatment area (mean)uniform-distribution assumption— Gy

Whole-liver equivalentif activity spread over total liver— Gy

Partition model uses T:N

Tumour dosewithin treatment area— Gy

Normal liver (treated)non-tumour, perfused— Gy

Lung shared

Lung dosevia shunt fraction— Gy

BSA method resin · recommended activity

Recommended activityDu Bois BSA— GBq

Implied mean treated doseat recommended activity— Gy

Green ≤70 Gy / orange >70 Gy on treated normal liver. Lung: yellow >15 Gy, red >30 Gy (IFU single-administration limit 25 Gy). FLR <30% flagged red.

Liver Diagram

Vessel width

Faint

Vessel Admin point (★) Tumour (ovoid)

Vessel: click-drag to draw freehand. Admin point: click to drop a star. Tumour: click-drag to size an ovoid. Liver image: load your own picture as a faded backdrop (adjust the Faint slider), then draw over it.

Export & Reset

PDF/JPEG include patient details, all three model results, and the annotated diagram, with the not-for-clinical-use notice.

Spectrum IR — internal cross-check tool. Constants & formulas per published Y-90 SIRT dosimetry literature.