This treatment uses a radiotherapy machine that is able to take pictures or images during your treatment. The pictures are taken over a period of time so that they capture any movement of the tumour. The information from the pictures is used to adjust the radiotherapy treatment area during your treatment. This means that as the tumour moves, it’s possible to make sure it’s fully treated. 4D radiotherapy is particularly helpful for tumours that are in an area of the body that moves during the time you’re having treatment. For example, tumours in the lung which move as you breathe.
4D radiotherapy isn’t widely available in the UK. Some treatment centres are using it in clinical trials to find out which people will benefit most from it.