Dosimetric Perturbation due to Scattered Rays Released by a Gold Marker Used for Tumor Tracking in External Radiotherapy
| Autor: | Kosaku Habara, Naoki Hayashi, Tomohiro Shimozato, Takashi Furukawa, Ryota Kawanami, Yuichi Aoyama, Kanji Matsuura, Keisuke Yasui, Yasunori Obata |
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| Rok vydání: | 2011 |
| Předmět: |
Dose perturbation
Materials science medicine.medical_treatment Monte Carlo method Dose distribution Radiation Dosage External radiotherapy medicine Scattering Radiation Radiometry Lung Multi grid Gold Radioisotopes Phantoms Imaging business.industry Radiotherapy Planning Computer-Assisted Radiotherapy Dosage General Medicine Gold marker Radiation therapy Tumor tracking Radiopharmaceuticals Nuclear medicine business Monte Carlo Method Radiotherapy Image-Guided |
| Zdroj: | Japanese Journal of Radiological Technology. 67:1164-1173 |
| ISSN: | 1881-4883 0369-4305 |
| DOI: | 10.6009/jjrt.67.1164 |
| Popis: | Image-guided radiation therapy using a gold marker-based tumor tracking technique provides precise patient setup and monitoring. However, the marker consists of high-Z material, and the resulting scattered rays tend to have adverse effects on the dose distribution of radiotherapy. The purpose of this study was to evaluate the dosimetric perturbation due to the use of a gold marker for radiotherapy in the lungs. The relative dose distributions were compared with film measurement, Monte Carlo simulation, and XiO calculation with the multi grid superposition algorithm using two types of virtual lung phantoms, which were composed of tough water phantoms, tough lung phantoms, cork boards, and a 2.0-mm-diameter gold ball. No dose increase and decrease in the vicinity of the gold ball was seen in the XiO calculations, although it was seen in the film measurements and the Monte Carlo simulation. The dose perturbation due to a gold marker cannot be evaluated using XiO calculation with the superposition algorithm when the tumor is near a gold marker (especially within 0.5 cm). To rule out the presence of such dose perturbations due to a gold marker, the distance between the gold marker and the tumor must therefore be greater than 0.5 cm. |
| Databáze: | OpenAIRE |
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