A dosimetric study of small photon fields using polymer gel and Gafchromic EBT films
| Autor: | Mohammad Hassan Zahmatkesh, Kaveh Shirani, Hassan Ali Nedaie, Hossein Hassani |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Photon
Materials science Film Dosimetry Polymers medicine.medical_treatment Dose distribution Radiation Dosage Sensitivity and Specificity Radiosurgery Ionization medicine Proton Therapy Dosimetry Radiology Nuclear Medicine and imaging Polymer gel Dosimeter Radiological and Ultrasound Technology business.industry Reproducibility of Results Dose-Response Relationship Radiation Equipment Design Ascorbic acid Equipment Failure Analysis Oncology Thermoluminescent Dosimetry Nuclear medicine business Gels Biomedical engineering |
| Zdroj: | Medical dosimetry : official journal of the American Association of Medical Dosimetrists. 39(1) |
| ISSN: | 1873-4022 |
| Popis: | The use of small field sizes is increasingly becoming important in radiotherapy particularly since the introduction of stereotactic radiosurgery and intensity-modulated radiation therapy techniques. The reliable measurement of delivered dose from such fields with conventional dosimeters, such as ionization chambers, is a challenging task. In this work, methacrylic and ascorbic acid in gelatin initiated by copper polymer gel dosimeters are employed to measure dose in 3 dimensions. Field sizes of 5 × 5mm(2), 10 × 10mm(2), 20 × 20mm(2), and 30 × 30mm(2) are investigated for a 6-MV x-rays. The results show an agreement with Gafchromic film, with some variation in measured doses near the edge of the fields, where the film data decrease more rapidly than the other methods. Dose penumbra widths obtained with gel dosimeters and Gafchormic film were generally in agreement with each other. The results of this work indicate that polymer gel dosimetry could be invaluable for the quantification of the 3-dimensional dose distribution in small field size. |
| Databáze: | OpenAIRE |
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