Linear accelerator radiotherapy. Woman patient about to undergo radiotherapy (radiation treatment) on a linear accelerator to treat a brain tumour. She lies stationary while the device rotates around her head. Linear accelerators are used as a source for high-voltage X-rays, which can penetrate the body to a greater depth and deliver a larger X-ray dose to the target area relative to the dose at the skin. Radiotherapy is frequently used to treat people suffering from a range of cancers, often combined with surgery or chemotherapy (drug treatments). Radiotherapy may be used to treat and destroy tumours of the breast and brain.
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