Ionising radiation in infancy and adult cognitive function

doi:10.1136/bmj.328.7439.581-a

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Protocols for computed tomography must be optimised

Jill Meara, deputy director (jill.meara@nrpb.org),
Gerry Kendall, head, population exposure department,
Colin Muirhead, group leader, epidemiology,
Barry Wall, group leader, medical dosimetry

National Radiological Protection Board, Chilton, Didcot, Oxfordshire OX11 0RQ

EDITOR—Hall et al report adverse effects on adult cognitive function among male patients treated with radiation for skin haemangioma during infancy.1 The evidence for effects was strongest among those receiving the highest doses.

It is unclear whether there was a dose threshold below which no effects occurred. This study of a sizeable cohort seems to be well conducted with …