What should you know about orthovoltage radiotherapy?

The treatment machine directs X-rays into a selected area. Compared with higher-energy beams used for deeper targets, orthovoltage beams deposit more of their dose close to the surface. This can help a radiation team treat a skin lesion or shallow tumour while planning around nearby normal tissue.

Before treatment, the team examines the area and may use imaging or measurements to define the target. A small shield, mould or positioning aid can help shape the treatment field. The beam itself is not felt, although the room setup and keeping still may feel unfamiliar.

Ask whether the skin should be left free of creams, deodorant or dressings before each session. Wear clothing that allows easy access to the treatment area, and tell the team about medicines, previous radiotherapy, implanted devices or a wound nearby.

Treatment may be given as a planned course or as a smaller number of appointments, depending on the target and the purpose of treatment. Keep the treated skin clean, avoid rubbing or picking it, and use only products recommended by the radiotherapy team. Tiredness, redness, dryness, peeling or tenderness can develop during or after treatment; report changes early so they can be assessed.

Contact the radiotherapy team promptly if the treated area becomes increasingly painful, breaks down, bleeds, develops marked swelling or produces fluid. Seek urgent medical help for severe breathing difficulty, sudden confusion, new weakness, or heavy bleeding, even if the treatment area is elsewhere.

Which tissue is being targeted, and why is an orthovoltage beam suitable for its depth? How many appointments are planned? What skin changes should I expect, and which products are safe? Who should I contact outside clinic hours?