NMD-36

%ID/g snapshot

Biodistribution.

Reading speed

Nuclear medicineuptake

Governing equation

\\%\\mathrm{ID}/g=100\\,C V/A_0

$C \in \left[0.1, 500\right]$

where

C: C (kBq/ml)
V: ROI vol (ml)
A_0: A0 (MBq)
%ID: %ID (%)

The figure, part by part

Each numbered marker wears the color of its card. Hover a card to light the marker. Tap a marker to jump to that card. The slider walks a red point along the curve; Animate drawing traces it like a pen.

00:0 / 00:08

①

Governing law — red

\\%\\mathrm{ID}/g=100\\,C V/A_0

$C \in \left[0.1, 500\right]$

$C = 0.1$ $%ID = 1\times 10^{-4}$

Along the curve

②

Domain of the variable — blue

C_{\min} = 0.1,\quad C_{\max} = 500

$C \in \left[0.1, 500\right]$

$C = 0.1$ $C = 0.1$

Along the curve

③

Response curve — green

\\%\\mathrm{ID}/g=100\\,C V/A_0

$C \in \left[0.1, 500\right]$

$C = 0.1$ $%ID = 1\times 10^{-4}$

Along the curve

④

Rate of change — amber

\frac{\mathrm{d}%ID}{\mathrm{d}C}

$C \in \left[0.1, 500\right]$

$C = 3.244$ $%ID^{\prime} = 1\times 10^{-3}$

Along the curve

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-36 — %ID/g snapshot) is the form associated with uptake. Working symbols: $C$ , $V$ , $A_0$ $\rightarrow$ $%ID$ . Biodistribution.

Purpose

Purpose: compute

%ID

from

C

V

A_0

in Nuclear medicine via

\\%\\mathrm{ID}/g=100\\,C V/A_0

Biodistribution. 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

C = 50.000\,\mathrm{kBq/ml}

V = 2.000\,\mathrm{ml}

A_0 = 200.000\,\mathrm{MBq}

, the governing relation

\\%\\mathrm{ID}/g=100\\,C V/A_0

yields

%ID = 0.050\,\mathrm{%}

. Biodistribution. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

C C50 kBq/mlROI vol V2 mlA0 A_0200 MBq

Outputs

%ID %ID0.050 %

Reading speed

Watch on YouTube

Free library

Full library

Free PDF / open book

YouTube channels

00:0 / 00:08

Narration of this film

Biodistribution.

Reading speed

Watch on YouTube