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Development of a phantom for dose distribution verification in Stereotactic Radiosurgery
Nilseia Aparecida Barbosa1, Luiz Antonio Ribeiro da Rosa, Delano Valdivino Santos Batista
1Instituto de Radioproteção e Dosimetria, CNEN, Av. Salvador Allende Barra da Tijuca, 22783-127 Rio de Janeiro, Brazil.
Summary
A novel acrylic phantom effectively verifies dose distribution in stereotactic radiosurgery. This quality control tool ensures accurate radiation delivery for tumor targets and organs at risk.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiosurgery Quality Assurance
Background:
- Stereotactic radiosurgery (SRS) requires precise dose delivery verification.
- Existing methods for dose distribution assessment can be complex.
- A need exists for robust and accessible phantom systems for quality control.
Purpose of the Study:
- To design and construct a geometric acrylic phantom for dose distribution verification in SRS.
- To assess the accuracy of radiation dose delivery using this phantom system.
- To evaluate the phantom's utility as a quality control tool in radiosurgery.
Main Methods:
- A geometric acrylic phantom was fabricated with components simulating tumor targets (TV) and organs at risk (OAR).
- Thermoluminescence (TL) dosimeters (TLD-100) and radiochromic films (Gafchromic EBT) were used for dose measurement.
- The phantom was subjected to a Varian 2300C/D linear accelerator's 6 MV photon beam for radiosurgical treatment simulation.
Main Results:
- TL dosimeters provided point dose measurements that were compared against planned dose values.
- Radiochromic films successfully depicted the dose distributions within the phantom.
- The phantom system demonstrated its capability to verify dose accuracy at specific points and overall distribution.
Conclusions:
- The developed acrylic phantom system is a valuable tool for quality control in stereotactic radiosurgery.
- It enables effective verification of dose delivery accuracy and distribution.
- This phantom facilitates reliable assessment of radiosurgical treatment plans.
