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Open Access Green as soon as Postprint is submitted to ZB.
Dose conversion coefficients for paediatric CT examinations with automatic tube current modulation.
Phys. Med. Biol. 57, 6309-6326 (2012)
A common dose-saving technique used in modern CT devices is automatic tube current modulation (TCM), which was originally designed to also reduce the dose in paediatric CT patients. In order to be able to deduce detailed organ doses of paediatric models, dose conversion coefficients normalized to CTDI(vol) for an eight-week-old baby and seven- and eight-year-old children have been computed accounting for TCM. The relative difference in organ dose conversion coefficients with and without TCM is for many organs and examinations less than 10%, but can in some cases amount up to 30%, e.g., for the thyroid in the chest CT of the seven-year-old child. Overall, the impact of TCM on the conversion coefficients increases with increasing age. Besides TCM, also the effect of collimation and tube voltage on organ dose conversion coefficients has been investigated. It could be shown that the normalization to CTDI(vol) leads to conversion coefficients that can in most cases be considered to be independent of collimation and tube voltage.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
automatic tube ccurrent moddulation; paediatric CT; organ doses; dose conversion coefficients; HELICAL CT; COMPUTED-TOMOGRAPHY; PHANTOMS; SPECTRA; PROGRAM; SCANS; BODY
ISSN (print) / ISBN
0031-9155
e-ISSN
1361-6560
Journal
Physics in Medicine and Biology
Quellenangaben
Volume: 57,
Issue: 20,
Pages: 6309-6326
Publisher
Institute of Physics Publishing (IOP)
Publishing Place
Bristol
Reviewing status
Peer reviewed