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Radiation Planning Assistant - A Streamlined, Fully Automated Radiotherapy Treatment Planning System

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Brachytherapy dose-volume histogram commissioning with multiple planning systems.

Michael S Gossman¹, Samuel S Hancock, Rajat J Kudchadker

¹Tri-State Regional Cancer Center, Regulation Directive Medical Physics. MGossman@TSRCC.com.

Journal of Applied Clinical Medical Physics

|April 9, 2014

Summary

This study introduces a novel quality assurance (QA) process for validating dose-volume histogram (DVH) data in brachytherapy radiation therapy. The method ensures treatment planning system (TPS) accuracy, with average DVH discrepancies below 1%.

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Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Dosimetry

Background:

Accurate dose calculation is critical in brachytherapy radiation therapy.
Quality assurance (QA) for treatment planning systems (TPS) is essential for patient safety.
Validation of dose-volume histogram (DVH) data from TPS is a complex but necessary process.

Purpose of the Study:

To present the first quality assurance (QA) process for validating dose-volume histogram (DVH) data in brachytherapy.
To demonstrate a reproducible method for verifying volumetric statistics from radiation therapy TPS.
To establish acceptance criteria for TPS commissioning, upgrading, and annual testing.

Main Methods:

A rectangular cuboid was contoured in five commercial brachytherapy TPS.
Dose deposition calculations were performed using AAPM Task Group 43 (TG-43) formalism.
Hand-calculated DVH data were compared against TPS-generated DVH data for validation.

Main Results:

The average disagreement between hand calculations and TPS-generated DVH data was less than 1%.
Discrepancies were less than 5% for radial distances between 1 cm and 5 cm.
The QA process demonstrated high reproducibility and accuracy across multiple TPS.

Conclusions:

A reproducible QA process for validating brachytherapy TPS DVH data has been established.
This method satisfies QA requirements for TPS commissioning, upgrades, and annual testing.
Recommended investigation thresholds for DVH variance are provided to ensure treatment accuracy.