NMD-04

Percent injected dose

%ID = 100 A_organ / A_inj. Fraction of the injection in an organ.

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Uptake%ID

Governing equation

\%\mathrm{ID}=100\,A_{\mathrm{organ}}/A_{\mathrm{inj}}

where

A_{org}: Organ activity (MBq)
A_{inj}: Injected activity (MBq)
\%ID: Percent injected dose (%)

Lecture brief

Historical brief

MIRD schema, in-vivo decay, uptake fractions and PET coincidence turned unsealed sources into organ dose. The sheets compute activity, residence and well-counter geometry. This sheet (NMD-04 — Percent injected dose) is the form associated with %ID. Working symbols: $A_{org}$ , $A_{inj}$ $\rightarrow$ $\%ID$ . Decay-correct the organ counts back to injection time before dividing. %ID/g is the density version.

Purpose

Purpose: compute

\%ID

from

A_{org}

A_{inj}

in Nuclear medicine via

\%\mathrm{ID}=100\,A_{\mathrm{organ}}/A_{\mathrm{inj}}

%ID = 100 A_organ / A_inj. Fraction of the injection in an organ. Use it when a real nuclear medicine question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given

A_{org} = 40.000\,\mathrm{MBq}

A_{inj} = 370.000\,\mathrm{MBq}

, the governing relation

\%\mathrm{ID}=100\,A_{\mathrm{organ}}/A_{\mathrm{inj}}

yields

\%ID = 10.81\,\mathrm{%}

. A syringe, an organ, a percentage. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Organ activity A_{org}40 MBqInjected activity A_{inj}370 MBq

Outputs

Percent injected dose \%ID10.81 %

Reading speed

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Narration of this film

A syringe, an organ, a percentage.

Decay-correct the organ counts back to injection time before dividing. %ID/g is the density version.

Reading speed

Watch on YouTube