Slide show: Radiation therapy treatment planning
Photo of treatment marks being made on a man's body
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To indicate the area where radiation should be aimed, your radiation therapy team uses a combination of laser lights and marks on your body. This also ensures that your body is precisely aligned and positioned properly for each treatment session.

What type of mark you receive depends on your cancer and your treatment. In certain cases, marks are drawn on your skin with a marker. You can wash these marks off once your final treatment is completed.

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