A model-based approach of scatter dose contributions and efficiency of apron shielding for radiation protection in CT.

Details

Serval ID
serval:BIB_39231EF10C26
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A model-based approach of scatter dose contributions and efficiency of apron shielding for radiation protection in CT.
Journal
Physica Medica : Pm : An International Journal Devoted To the Applications of Physics To Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (aifb)
Author(s)
Weber N., Monnin P., Elandoy C., Ding S.
ISSN
1724-191X (Electronic)
ISSN-L
1120-1797
Publication state
Published
Issued date
2015
Peer-reviewed
Oui
Volume
31
Number
8
Pages
889-896
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Given the contribution of scattered radiations to patient dose in CT, apron shielding is often used for radiation protection. In this study the efficiency of apron was assessed with a model-based approach of the contributions of the four scatter sources in CT, i.e. external scattered radiations from the tube and table, internal scatter from the patient and backscatter from the shielding. For this purpose, CTDI phantoms filled with thermoluminescent dosimeters were scanned without apron, and then with an apron at 0, 2.5 and 5 cm from the primary field. Scatter from the tube was measured separately in air. The scatter contributions were separated and mathematically modelled. The protective efficiency of the apron was low, only 1.5% in scatter dose reduction on average. The apron at 0 cm from the beam lowered the dose by 7.5% at the phantom bottom but increased the dose by 2% at the top (backscatter) and did not affect the centre. When the apron was placed at 2.5 or 5 cm, the results were intermediate to the one obtained with the shielding at 0 cm and without shielding. The apron effectiveness is finally limited to the small fraction of external scattered radiation.
Keywords
Models, Theoretical, Phantoms, Imaging, Radiation Dosage, Radiation Protection/instrumentation, Scattering, Radiation, Tomography, X-Ray Computed
Pubmed
Web of science
Create date
11/01/2016 18:40
Last modification date
20/08/2019 14:28
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