If you have been offered stereotactic body radiation therapy, commonly called SBRT, for lung cancer, think of it as a way to precisely target the tumor alone, either instead of surgery or when surgery is difficult. It is usually given over a few days in about three to five sessions, each delivering a relatively high dose in a short, intense burst. The treatment itself is painless and you do not lie there for long, but because accuracy is everything, preparation matters quite a lot.
The first step is simulation: a CT scan during which your treatment position is decided. Since you will be treated in exactly that position every time, it helps to practice in advance, raising your arms above your head or lying on a special support. Small dot-like marks may be left on your skin, or a custom immobilization frame made. As a rule these marks are meant to stay until treatment ends, so take care not to scrub them off too hard in the shower.
The lungs move with every breath, so managing your breathing is central to SBRT. Depending on the hospital, you may be asked to practice holding a breath after inhaling, or a device may switch the radiation on and off in time with your breathing. Practicing at home, breathing in deeply and holding comfortably for a few seconds, makes it much easier on the treatment table. If you cough a lot normally, it helps to mention it in advance so your cough medicine can be adjusted.
On treatment days, wear comfortable clothes with no metal decorations, and a top with few buttons or zippers makes changing easier. You can eat as usual, but a very full stomach can make the position uncomfortable, so a light meal is better. In the treatment room you will lie alone, and while the radiation is delivered you will hear the machine moving around you. It may look frightening, but there is no pain; just stay still in the marked position and breathe steadily.
After treatment, fatigue can set in over the following days to weeks. A dry cough may increase or the chest may feel slightly tight, but most of this eases with time. However, between a few weeks and a few months afterward, what is called radiation pneumonitis can cause cough, shortness of breath, and a low fever, so if your breathing becomes more labored than usual, do not brush it off; let the hospital know.
Because SBRT is short and intense, good preparation lets you return to daily life quickly. Learn the position, practice the breathing, and watch your body's signals after treatment. Tending to just these three things lets you finish treatment far more confidently. Confirm the detailed schedule and precautions carefully in advance with the radiation oncology team carrying out your treatment.
This article shares general medical information in plain language and does not replace individual diagnosis or treatment. Please discuss any specific decisions with your own care team.