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Dosimetric verification by using the ArcCHECK system and 3DVH software for various target sizes
Jin Ho Song1, Hun-Joo Shin2, Chul Seung Kay2
1Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
Plos One
|March 26, 2015
Summary
The 3DVH software and ArcCHECK detector offer a simple quality assurance method for radiation therapy plans. However, accuracy, especially with smaller targets, requires careful evaluation.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiotherapy Quality Assurance
Background:
- Accurate dose delivery verification is crucial in radiation therapy.
- The 3DVH software and ArcCHECK detector are tools for quality assurance.
Purpose of the Study:
- To assess the utility of 3DVH software with ArcCHECK for quality assurance in new radiotherapy plans.
- To evaluate the impact of target size on plan verification accuracy.
Main Methods:
- Compared ion chamber measurements with planned and 3DVH predicted doses.
- Evaluated 2D and 3D gamma passing rates using ArcCHECK and 3DVH software.
- Obtained dose-volume histogram (DVH)-based predicted metrics.
Main Results:
- Isocenter dose deviation was under 1% for most plans, except for a 1 cm target.
- 3D gamma passing rates decreased with larger target sizes, particularly with stricter criteria.
- No correlation was found between gamma passing rates and DVH metrics in high-dose gradient regions.
Conclusions:
- 3DVH and ArcCHECK provide valuable quality assurance data through an accessible method.
- The accuracy of this system needs cautious interpretation, especially concerning target size variations.
