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3D evaluation of 3DVH program using BANG3 polymer gel dosimeter.

Yoichi Watanabe¹, Yuji Nakaguchi

¹Department of Radiation Oncology, University of Minnesota, 420 Delaware Street Southeast, MMC-494, Minneapolis, Minnesota 55455, USA. watan016@umn.edu

Medical Physics

|August 10, 2013

Summary

The ArcCHECK™-3DVH system accurately estimates 3D radiation dose distribution for intensity modulated arc therapy. While generally accurate, it showed differences in dose uniformity and gradient compared to treatment planning software.

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Area of Science:

Medical Physics
Radiation Oncology
Dosimetry

Background:

Intensity modulated arc therapy (IMAT) requires precise 3D dose validation.
The ArcCHECK™-3DVH system offers a method for reconstructing patient-specific 3D dose distributions.

Purpose of the Study:

To evaluate the accuracy of the ArcCHECK™-3DVH system.
To compare ArcCHECK™-3DVH system results with BANG3 polymer gel dosimetry and Pinnacle3 treatment planning software.

Main Methods:

A cylindrical phantom filled with BANG3 gel simulated a patient for prostate radiotherapy.
Volumetric modulated arc therapy plans were delivered to both the phantom and an ArcCHECK™ device.
3D dose distributions were analyzed using gamma index, isodose line overlays, and dose-volume histograms.

Main Results:

The ArcCHECK™-3DVH system showed a 99.1% gamma passing rate (3%/3mm/25% LDT) compared to Pinnacle3.
BANG3 gel measurements yielded a 95.7% gamma passing rate against Pinnacle3.
Minor discrepancies were observed in PTV and organ-at-risk dose distributions between the systems.

Conclusions:

The ArcCHECK™-3DVH system provides clinically acceptable 3D dose distribution accuracy.
Differences in dose uniformity and gradient were noted between the ArcCHECK™-3DVH system/BANG3 and Pinnacle3.
Further research is needed to understand these observed dose distribution variations.