Respiratory gating is a breathing technique used during external radiation therapy. It uses a device that monitors your breathing and adjusts the radiation beam as needed during treatment. External radiation therapy uses a precise beam of radiation, aimed into the body to damage cancer cells (tumor). It is important that the radiation beam targets all or most of the tumor, while sparing as much healthy tissue as possible. As you breathe in and out, tumors in the belly or chest area can shift or move. This movement is normal. Respiratory gating focuses on the tumor’s movement through the breathing process, so that your tumor stays the primary target of radiation. It is most often used in the treatment of tumors in the chest, abdomen (belly), and breast. 

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To learn more, please click on https://moffitt.org/treatments/radiation-therapy/respiratory-gating/