Small metal markers (up to 5) will then be placed near your tumor. A thin, flexible tube with a camera, called a bronchoscope, will be used to place these markers in your lungs. You will be given a sedative through one of your veins and a local anesthetic will be sprayed in your nose and mouth before introducing the bronchoscope. The bronchoscope is introduced through one of your nostrils and then passed into your windpipe and bronchial tubes. This will allow the doctor to examine your lungs and place the small metal markers. These markers will be used to track the tumor during treatment. In this way the radiation treatment can be given to the tumor even if it moves while you breathe.