Study of Dosimetric Properties of Flattening Filter Free Photon Beam Passing through Cadmium Free Compensator Alloy.
Alloys
Photons
X-rays
Journal
Journal of biomedical physics & engineering
ISSN: 2251-7200
Titre abrégé: J Biomed Phys Eng
Pays: Iran
ID NLM: 101589641
Informations de publication
Date de publication:
Dec 2019
Dec 2019
Historique:
received:
25
02
2017
accepted:
22
03
2017
entrez:
11
2
2020
pubmed:
11
2
2020
medline:
11
2
2020
Statut:
epublish
Résumé
This study aims to investigate radiation beam geometry of Cyberknife beam and change in dosimetric characteristics of six megavoltage (6MV) flattening filter free (FFF) beam after passing through high density cadmium free compensator alloy. In this experimental study, changes in FFF beam dosimetric characteristics after passing through compensator alloy was measured. Transmitted intensity of FFF beam was measured in air by an ion chamber at a source to detector distance (SDD) of 800mm. Extended SDD measurement also has been performed at a distance of 1270mm to analyze scattering due to compensator. Linear attenuation coefficient (µ Linear attenuation coefficient of compensator alloy was measured 0.042 (Standard Deviation ±0.00099) mm Cyberknife beam has been found to be narrow beam geometry. FFF beam contains lesser scattered photons. Presence of high density compensator filters out the soft x-ray photon causes significant dosimetric changes.
Sections du résumé
BACKGROUND
BACKGROUND
This study aims to investigate radiation beam geometry of Cyberknife beam and change in dosimetric characteristics of six megavoltage (6MV) flattening filter free (FFF) beam after passing through high density cadmium free compensator alloy.
MATERIAL AND METHODS
METHODS
In this experimental study, changes in FFF beam dosimetric characteristics after passing through compensator alloy was measured. Transmitted intensity of FFF beam was measured in air by an ion chamber at a source to detector distance (SDD) of 800mm. Extended SDD measurement also has been performed at a distance of 1270mm to analyze scattering due to compensator. Linear attenuation coefficient (µ
RESULTS
RESULTS
Linear attenuation coefficient of compensator alloy was measured 0.042 (Standard Deviation ±0.00099) mm
CONCLUSION
CONCLUSIONS
Cyberknife beam has been found to be narrow beam geometry. FFF beam contains lesser scattered photons. Presence of high density compensator filters out the soft x-ray photon causes significant dosimetric changes.
Identifiants
pubmed: 32039095
doi: 10.31661/jbpe.v0i0.745
pii: JBPE-9-6
pmc: PMC6943851
doi:
Types de publication
Journal Article
Langues
eng
Pagination
647-652Informations de copyright
Copyright: © Shiraz University of Medical Sciences.
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