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Radiation transport calculations for narrow scanned photon beams using Geant4
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The increasing cancer incident requires more advanced treatment techniques in the radiotherapy departments. The clinics requires more accurate, safe and fast dose delivery to shorten the treatment time at the same time as the treatment outcome is maximised. In this thesis a newly developed thin transmission target technique for scanned narrow photon beam dose delivery is investigated. The target is made of a material with low atomic number that converts the incident high energy electron beam of low emittance to a narrow intense bremsstrahlung beam. A purging magnet and an electron collector are vital components in a system generating narrow scanned photon beams for radiobiological optimised radiation therapy. These parts of an advanced treatment head have been investigated and developed using Monte Carlo simulations with the object oriented simulation toolkit Geant4 originated at CERN. The strategy of this work was to first investigate how the low energy implementation of the physical processes worked compared to the standard implementation in Geant4. Differences were found and used to develop the program further. After this a magnetic field was implemented and compared to calculations. Good accuracy was found. Preliminary investigation of design and location of the electron collector was made for maximum absorption of unwanted electrons in the therapeutic beam. The scanning system, purging magnet, electron collector and a multi leaf collimator are well integrated to generate photon beams with features suitable for efficient and safe treatment. This development of narrow pencil beam technique in the compact treatment head is an important step towards fast and accurate advanced intensity modulated dose delivery based on radiobiological treatment optimisation.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Radiation therapy, treatment head, compact racetrack, Medical Radiation Physics, CERN, narrow scanned, photon beams, purging magnet, electron collector, IMRT, thin, transmission target technique, Geant4, Monte Carlo, simulations
Keyword [sv]
URN: urn:nbn:se:ltu:diva-47648ISRN: LTU-EX--02/354--SELocal ID: 52d673df-5ade-4a11-b20f-3b19bb3b2d59OAI: diva2:1020976
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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