Is intensity-modulated radiotherapy done with a linear accelerator?

A linear accelerator produces high-energy radiation and directs it toward a planned treatment area. For IMRT, treatment-planning software divides the field into shaped segments with different intensities. The machine delivers those segments from planned angles while the treatment team positions and monitors you.

The aim is to give the prescribed dose to the target while reducing exposure to nearby healthy tissue where possible. The achievable plan depends on the tumour's location, shape, movement, and the organs close to it. IMRT can include techniques in which the machine changes shape while rotating around you.

Follow instructions about bladder or bowel preparation if your centre gives them, and keep the same position during imaging and treatment. Tell the radiotherapy team if pain, swelling, breathing difficulty, or trouble holding the planned position develops. Ask how the skin and treatment area should be cared for.

Call the treatment team about severe or rapidly worsening pain, significant skin breakdown, persistent vomiting, new neurological symptoms, difficulty swallowing, or breathing problems. The appropriate response depends on the body area treated, so give the team the exact symptom and when it began.

Will a linear accelerator deliver my IMRT plan? Which organs are being protected? How is my position checked, and what preparation is needed before each session?