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2014 ; 83
(10
): 1920-4
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Estimation of effective dose and lifetime attributable risk from multiple head CT
scans in ventriculoperitoneal shunted children
#MMPMID25130177
Aw-Zoretic J
; Seth D
; Katzman G
; Sammet S
Eur J Radiol
2014[Oct]; 83
(10
): 1920-4
PMID25130177
show ga
PURPOSE: The purpose of this review is to determine the averaged effective dose
and lifetime attributable risk factor from multiple head computed tomography (CT)
dose data on children with ventriculoperitoneal shunts (VPS). METHOD AND
MATERIALS: A total of 422 paediatric head CT exams were found between October
2008 and January 2011 and retrospectively reviewed. The CT dose data was weighted
with the latest IRCP 103 conversion factor to obtain the effective dose per study
and the averaged effective dose was calculated. Estimates of the lifetime
attributable risk were also calculated from the averaged effective dose using a
conversion factor from the latest BEIR VII report. RESULTS: Our study found the
highest effective doses in neonates and the lowest effective doses were observed
in the 10-18 years age group. We estimated a 0.007% potential increase risk in
neonates and 0.001% potential increased risk in teenagers over the base risk.
CONCLUSION: Multiple head CTs in children equates to a slight potential increase
risk in lifetime attributable risk over the baseline risk for cancer, slightly
higher in neonates relative to teenagers. The potential risks versus clinical
benefit must be assessed.