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Beta dosimetry with microMOSFETs for endovascular brachytherapy
Eva Drud1, Manuel Todorovic, Thies Schönborn
1Department of Radiotherapy and Radio-oncology, Center for Diagnostic Imaging and Image Guided Therapy, University Medical Center Hamburg-Eppendorf, Germany. e.drud@uke.uni-hamburg.de
Physics in Medicine and Biology
|November 18, 2006
Summary
MicroMOSFET dosimeters are suitable for quality assurance of beta sources in endovascular brachytherapy. They accurately measure dose distribution and assess stent influence on dose, ensuring treatment efficacy.
Area of Science:
- Medical Physics
- Radiation Dosimetry
Background:
- Accurate dosimetry and quality assurance are critical for effective endovascular brachytherapy (EVBT).
- MicroMOSFET dosimeters offer potential for precise measurements in complex radiation fields.
Purpose of the Study:
- To evaluate the suitability of microMOSFET dosimeters for dosimetry and quality assurance of beta sources used in EVBT.
- To assess the impact of stents on dose distribution during EVBT.
Main Methods:
- MicroMOSFETs were tested for angular and dose rate dependence using electron beams (6 and 12 MeV) and an iridium-192 source.
- Depth dose curves were measured and compared with OPTIDOS.
- The influence of a stainless steel stent on dose distribution in water was evaluated.
Main Results:
- MicroMOSFETs demonstrated suitability for quality assurance of beta sources in EVBT.
- Measurements showed good agreement between microMOSFETs and OPTIDOS for depth dose curves.
- A stainless steel stent caused a dose inhomogeneity of +/-8.5% but did not significantly alter the beta spectrum.
Conclusions:
- MicroMOSFETs are a viable tool for dosimetry and quality assurance of beta sources in EVBT.
- Stents can introduce dose inhomogeneity, necessitating careful treatment planning.
- MicroMOSFETs provide reliable data for optimizing EVBT procedures.
