During the treatment procedure, there are high chances of your tumour moving around even though you are lying still. This is common in lung or abdomen cancer. This unnecessary movement of tumour cells makes it difficult to target the tumour and causes damage to the healthy tissues. To prevent this from happening, you need an advanced diagnostic setup to track the movement. This is achieved by 4D computed tomography. This 4D technology shows the motion of internal organs as you breathe. So, once the tumour is in the planned treatment field, the radiations are emitted. This helps in targeting the cancerous tissue correctly and effectively.