Scans to target head cancer at Velindre and Singleton

Detailed imaging techniques are to help doctors target head and neck cancers more effectively, in a £720,000 clinical trial in Cardiff and Swansea.

Doctors say this sort of PET scanning not only sees the tumour's outline, as it would on a CT or MRI scan, but it also sees the tumour's activity - and help work on the most active areas.

Oncologist Dr Mererid Evans explains how it works.