Until now, the increased risk of cancer from CT scans has been modelled from the data gathered from survivors of the Hiroshima and Nagasaki bombings. However, new BMJ research, based on a large Australian cohort, offers new evidence to support the modelling. John Matthews, from the university of Melbourne, joins us to explain what they found.

Also this week, social media is relatively new – but did you realise that doctors had been using social networks to improve health for centuries? Enrico Coiera, director of the Centre for Health Informatics at the University of New South Wales, explains more, and how in the digital age we might try and use virtual networks to do the same job on a larger scale.

See also:

Cancer risk in 680 000 people exposed to computed tomography scans in childhood or adolescence

Social networks, social media, and social diseases