Safer CT scans

Safer CT scans for children are the goal of a new approach to determining correct radiation dosages.

A multi-disciplinary team involving researchers from Westmead Hospital, The Children’s Hospital at Westmead, Flinders and Sydney Universities, and CSIRO has begun trials of a new atlas of child body types which will allow radiation doses in computed tomography (CT) scans to be estimated much more accurately for children.

The method is based on new models of children’s bodies at different ages, which have been developed by the Biomedical Image Analysis group at the CSIRO ICT Centre, led by Dr Sébastien Ourselin.

Associate Professor Donald McLean of Westmead Hospital’s Medical Physics Department says that this will allow doses to be accurately known across the whole range of child sizes, and then made available clinically through a simple dose calculator.

“CT dose to children can vary by as much as 3600 per cent between different clinical centres,” says Professor McLean. “The use of an accurate CT dose calculator will allow radiographers to determine child doses before the examination and so result in significant dose reductions.”