The role of PET and PET-CT in the radiotherapy plan

Oncology radiotherapy has entered into the biologic eonformal radiotherapy era which is guided by PET and PET-CT. PET and PET-CT can change and improve oncology integration therapy plan and the aim of radiotherapy plan, can make radiotherapy target volume more exact and reduce the observer variation in drawing the target volume, which can reduce target volume bias. More exact target volume leads to higher therapy-effect.