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Molecular radiotherapy: the NUKFIT software for calculating the time-integrated activity coefficient.

P Kletting¹, S Schimmel, H A Kestler

¹Klinik für Nuklearmedizin, Universität Ulm, Ulm 89081, Germany.

Medical Physics

|October 5, 2013

Summary

A new algorithm objectively calculates the time-integrated activity coefficient and standard error for molecular radiotherapy dosimetry. This user-friendly software ensures reproducible and accurate results for improved patient treatment planning.

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Area of Science:

Medical Physics
Radiochemistry
Nuclear Medicine

Background:

Accurate dosimetry is essential for effective molecular radiotherapy.
Existing software for calculating time-integrated activity coefficients has limitations in scope and methodology.
A need exists for objective and reproducible estimation methods tailored to molecular radiotherapy.

Purpose of the Study:

To develop and program an algorithm for objective and reproducible determination of the time-integrated activity coefficient and its standard error.
To address deficiencies in current software for molecular radiotherapy dosimetry.
To provide a user-friendly tool for calculating key dosimetric parameters.

Main Methods:

Algorithm development using MATLAB, incorporating sums of exponentials and selectable error models.
Objective function minimization to estimate parameters, with automatic determination of starting values.
Utilizing corrected Akaike information criterion for function selection and Gaussian error propagation for standard error estimation.

Main Results:

Validation against commercial software (NUKFIT, SAAM numerical) showed minimal differences (<1%) in fit parameters and time-integrated activity coefficients.
Automatic starting value determination demonstrated successful reproducibility.
Quality criteria and Akaike information criterion effectively selected suitable fitting functions.

Conclusions:

The developed software and methodology provide an objective and reproducible means to estimate the time-integrated activity coefficient and standard error.
The tool is suitable for a wide range of time-activity data encountered in molecular radiotherapy.
The software offers a user-friendly and mathematically sound solution for critical dosimetry calculations.