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British Journal of Radiology (1996) 69, 437-450
© 1996 British Institute of Radiology
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The British Journal of Radiology, Vol 69, Issue 821 437-450, Copyright © 1996 by British Institute of Radiology

ARTICLES

A comparison of doses and techniques between specialist and non-specialist centres in the diagnostic X-ray imaging of children

JC Kyriou, M Fitzgerald, A Pettett, JV Cook and SM Pablot
Radiological Protection Centre, St George's Hospital, London, UK.

A dosimetric survey of 14 routine X-ray examinations in children was carried out between 1993 and 1995. Two children's hospitals and four general hospitals took part in the survey which involved the calculation and measurement of nearly 3000 doses. Entrance surface doses (ESD) were calculated from exposure factors for radiographic procedures, and dose-area products (DAP) were recorded for both radiographic and fluoroscopic procedures. Doses were in good agreement with earlier studies, but for some procedures were significantly lower than those reported from other European countries. The main dose influencing factors for radiographic procedures were found to be the speed of the film-screen system and the use of an antiscatter grid. For the main head/trunk examinations, specialist centres often delivered higher doses to the younger children as a result of widespread use of a grid. In fluoroscopy, where the main dose influencing factors were the use of a grid and the dose rate dependence of the image intensifier, the children's hospitals consistently delivered significantly lower doses. Both ESDs and DAPs were found to increase with patient age for the main head/trunk examinations, although in some cases (AP/PA chest) this relationship was weak. The dependence of dose on age necessitates the subdivision of the paediatric sample into a number of age categories. It is suggested that all authors use the same age groupings.


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