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Effective point of measurement of thimble ion chambers in megavoltage photon beams

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1118/1.3266750
AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut des étalons nationaux de mesure du CNRC
FormatTexte, Article
Sujetbiomedical electrodes; dosimetry; ionisation chambers; linear accelerators; Monte Carlo; neurophysiology; phantoms; effective point of measurement
Résumé
Purpose: Determine the effective point of measurement (EPOM) of 12 thimble ion chambers, including miniature chambers and three models widely used for clinical reference dosimetry. The EPOM is the point at which the measured dose would arise in the measurement medium in the absence of the probe: For cylindrical chambers, it is shifted upstream relative to the central axis of the chamber. Although current dosimetry protocols prescribe a blanket upstream EPOM shift of 0.6r, with r as the chamber cavity radius, it has been shown in recent years that the EPOM does, in fact, depend on every detail of the chamber design and on the beam characteristics. In the wake of this finding, the authors undertake a comprehensive study of the EPOM for a series of chambers in water.
Date de publication
Dans
  • Medical Physics 37, nº 1 : 96–107.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC16378395
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrement88834416-f4d9-4a7a-8a9f-7d414a21df57
Enregistrement créé2010-11-15
Enregistrement modifié2020-04-17
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