Impact of a parallel magnetic field on radiation dose beneath thin copper and aluminum foils
| Autor: | Radim Barta, Andrei Ghila, Satyapal Rathee, Nicola De Zanche, B. Gino Fallone |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Radio Waves 0206 medical engineering chemistry.chemical_element Electrons 02 engineering and technology Radiation Dosage 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Aluminium Composite material Electrical conductor General Nursing Radiation Phantoms Imaging Radiotherapy Dosage 020601 biomedical engineering Copper Magnetic Resonance Imaging Magnetic field Magnetic Fields chemistry Magnet Ionization chamber Electromagnetic shielding Particle Accelerators Monte Carlo Method Beam (structure) Aluminum Radiotherapy Image-Guided |
| Zdroj: | Biomedical physicsengineering express. 6(3) |
| ISSN: | 2057-1976 |
| Popis: | Purpose: The RF coils for magnetic resonance image guided radiotherapy (MRIgRT) may be constructed using thin and/or low-density conductors, along with thinner enclosure materials. This work measures the surface dose increases for lightweight conductors and enclosure materials in a magnetic field parallel to a 6 MV photon beam. Methods: Aluminum and copper foils (9–127 μm thick), as well as samples of polyimide (17 μm) and polyester (127 μm) films are positioned atop a polystyrene phantom. A parallel plate ion chamber embedded into the top of the phantom measures the surface dose in 6 MV photon beam. Measurements (% of dose at the depth of maximum dose) are performed with and without a parallel magnetic field (0.22T at magnet center). Results: In the presence of a magnetic field, the unobstructed surface dose is higher (31.9%Dmax versus 22.2%Dmax). The surface dose is found to increase linearly with thickness for thin ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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