ArticleJournal of applied clinical medical physics2025
On the spectral changes of magna-field photon beams used in total body irradiation and impact on dosimetry.
Article in Journal of applied clinical medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- On the spectral changes of magna-field photon beams used in total body irradiation and impact on dosimetry.Journal of applied clinical medical physics · 2025Article
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Abstract
purposeAccurate dosimetry for magna fields can be challenging when dosimeters exhibit energy dependence. The aim of this work was to use Monte Carlo (MC) simulations to calculate energy spectra of magna photon fields and use the spectral information to derive energy dependence correction factors for commonly used dosimeters. MATERIALS AND
methodsPhoton beams of 6 and 10 MV energies were simulated using the TOol for PArticle Simulation (TOPAS) MC code. Reference and magna field conditions were simulated with differing field sizes and source-to-surface distances (SSDs). Average photon energy and tissue phantom ratios (TPRs) were calculated as a function of depth in addition to photon energy spectra at various depths. Previously reported known energy responses of a Farmer ion chamber, LiF-thermoluminescent dosimeters (TLDs), and alumina-optically stimulated luminescent dosimeters (OSLDs) were extracted to calculate the energy dependence correction factor k
resultsThe average photon energy decreased with depth, followed by an increase in the deepest regions due to the build-up of scattered photons. At the phantom midplane, the average photon energy changed from 1.3 to 0.6 MeV for the 6 MV beam and from 2.3 to 1.1 MeV for the 10 MV beam with the transition from reference to magna field conditions. The energy dependence was found to be negligible for the ion chamber, up to 2.0% for the TLDs, and up to 4.6% for the OSLDs.
conclusionsLarge spectral changes were reported between the reference conditions and the magna field conditions. The influence of beam softening in magna field was determined to be considerable for dosimetry using TLDs and OSLDs.
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