Quantification Toolkit · MIRF · UBC

Injected dose & uptake,from syringe to SUV.

Net injected activity after residual, tissue SUV and %ID/g, and per-animal dosing by body weight — built for the preclinical imaging bench.

The Calculator

Set the isotope once

Pick an isotope once — every panel uses the same half-life for decay correction. Everything updates live; nothing leaves your browser.

Isotope

Half-life

Auto-filled from the isotope. Editable for anything not listed.

Decay constant λ

λ = ln(2) / t½ · per second

The activity an animal actually received is the pre-injection syringe reading minus whatever stayed behind in the syringe and line. Each reading is decay-corrected to the injection time before subtracting, so assay clocks don't have to match.

Pre-injection activity (full syringe)

Pre-injection assay time

Injection time

Residual activity (empty syringe)

Leave at 0 if you don't measure residual.

Residual assay time

—

net activity delivered at injection time

Pre @ injection—

Residual @ injection—

Residual fraction—

Carries into the SUV tab. The net dose computed here is used automatically as the injected dose in the SUV & %ID/g panel (you can still override it there).

Standardized uptake value and percent injected dose per gram from a tissue measurement. Enter a concentration directly, or let the ROI helper convert a total ROI activity and volume for you. Both quantities are referenced to the same instant via decay correction.

Net injected dose

Auto-filled from the Net injected dose tab — edit to override.

Animal body weight

Decay-correct injected dose to scan time

Injection time

Scan / measurement time

Derive concentration from a total ROI activity + volume

Tissue activity concentration

Per mL of tissue (1 mL ≈ 1 g). Measured at scan time.

—

SUV_bw · standardized uptake value (g/mL)

%ID/g—

%ID in ROI—

Tissue conc.—

Dose @ scan—

SUV_bw = tissue concentration ÷ (injected dose ÷ body weight). Units are g/mL — activity per mL of tissue, normalized by injected activity per gram of body weight. Only with an assumed tissue density of 1 g/mL does this reduce to the familiar dimensionless SUV. For SUV normalized to lean mass or body surface area, substitute that term for body weight.

Plan a per-animal injection from a target activity per unit body weight. Optionally turn that into a draw-up volume from a stock concentration.

Target activity per body weight

Per kg of body weight (e.g. 10 MBq/kg).

Animal body weight

Also compute draw-up volume from a stock concentration

Stock concentration

—

activity per animal

Body weight—

Volume to draw—

Provided for academic and non-commercial use. Decay corrections use A = A₀·e^−λt with λ = ln(2)/t½. SUV_bw = tissue concentration ÷ (injected dose ÷ body weight); %ID/g = tissue concentration ÷ injected dose × 100 (numerator and denominator referenced to the same time). Always verify activities with a calibrated dose calibrator and follow your local QA procedures — this tool does not replace them.

Molecular Imaging Research Facility · UBC · invivoimaging.ca

Version 1.0 · Last updated June 2026 · Half-life data from published nuclide references