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Verfasst von:Holm, Kim Marina [VerfasserIn]   i
 Jäkel, Oliver [VerfasserIn]   i
 Krauss, Achim [VerfasserIn]   i
Titel:Water calorimetry-based kQ factors for Farmer-type ionization chambers in the SOBP of a carbon-ion beam
Verf.angabe:Kim Marina Holm, Oliver Jäkel and Achim Krauss
E-Jahr:2021
Jahr:14 July 2021
Umfang:17 S.
Fussnoten:Im Titel und in der Beschreibung ist bei der Zeichenfolge kQ das Q tiefgestellt ; Gesehen am 09.09.2021
Titel Quelle:Enthalten in: Physics in medicine and biology
Ort Quelle:Bristol : IOP Publ., 1956
Jahr Quelle:2021
Band/Heft Quelle:66(2021), 14, Artikel-ID 145012, Seite 1-17
ISSN Quelle:1361-6560
Abstract:The dosimetry of carbon-ion beams based on calibrated ionization chambers (ICs) still shows a significantly higher uncertainty compared to high-energy photon beams, a fact influenced mainly by the uncertainty of the correction factor for the beam quality kQ. Due to a lack of experimental data, kQ factors in carbon-ion beams used today are based on theoretical calculations whose standard uncertainty is three times higher than that of photon beams. To reduce their uncertainty, in this work, kQ factors for two ICs were determined experimentally by means of water calorimetry for the spread-out Bragg peak of a carbon-ion beam, these factors are presented here for the first time. To this end, the absorbed dose to water in the C-12-SOBP is measured using the water calorimeter developed at Physikalisch-Technische Bundesanstalt, allowing a direct calibration of the ICs used (PTW 30013 and IBA FC65G) and thereby an experimental determination of the chamber-specific kQ factors. Based on a detailed characterization of the irradiation field, correction factors for several effects that influence calorimetric and ionometric measurements were determined. Their contribution to an overall uncertainty budget of the final kQ factors was determined, leading to a standard uncertainty for kQ of 0.69%, which means a reduction by a factor of three compared to the theoretically calculated values. The experimentally determined values were expressed in accordance with TRS-398 and DIN 6801-1 and compared to the values given there. A maximum deviation of 2.3% was found between the experiment and the literature.
DOI:doi:10.1088/1361-6560/ac0d0d
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1088/1361-6560/ac0d0d
 Volltext: https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=DOISource&SrcApp=WOS&KeyAID=10.1088%2F1361-65 ...
 DOI: https://doi.org/10.1088/1361-6560/ac0d0d
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:absorbed dose to water
 carbon-ion beams
 co-60
 dosimetry
 k ( Q ) factors
 k(q) factors
 mv-photon
 photon beams
 proton
 radiotherapy
 response functions
 therapy
 water calorimetry
 x 10 cm
K10plus-PPN:1769947663
Verknüpfungen:→ Zeitschrift

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