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Can I read Session 51. Radiation therapy V – Advanced quality assurance on EtoBox?
Session 51. Radiation therapy V – Advanced quality assurance by Matthias Sure; Wolfgang W. Baus; Alexandra Hellerbach; Mauritius Hoevels; Harald Treuer is a Medicine article available to read on EtoBox.
What is Session 51. Radiation therapy V – Advanced quality assurance about?
Purpose: The focal spot size of photon beams is an important parameter of linear accelerators with main impact on beam penumbra and in small fields also on the output factor. Several methods have been proposed to determine the spot size but use in clinical routine is often challenging. In this work, we compare two methods with simple experimental setup, the iterative maximum-likelihood-estimation-maximization-(MLEM)-algorithm (Papaconstadopoulos,2016) for beam profiles and direct imaging using a beam-spot-camera. Methods: For both methods dose distributions were measured using radiochromic film (Gafchromic-EBT3) scanned with an EPSON 10000XL and evaluated using software written in MATLAB. The MLEM algorithm will update the source distribution after each iteration step. Reasonable stopping criteria were found through Monte-Carlo simulated data. The beam-spot camera consists of closely packed layers of lead (thickness 0.34mm) and polycarbonate (Lexan;0.26mm) with a length of 20cm. The full width-at-half-maximum (FWHM) of the dose profile was measured for various distances between the x-ray target and the film. An extrapolation of the FWHM-values was used to determine the spot size. T
Who reads Session 51. Radiation therapy V – Advanced quality assurance?
It is typically read by researchers, students, and practitioners in Medicine.
- Author
- Matthias Sure; Wolfgang W. Baus; Alexandra Hellerbach; Mauritius Hoevels; Harald Treuer
- Publisher
- Walter de Gruyter GmbH
- Published
- 2017
- Language
- EN
- Field
- Medicine (Health Sciences)