High Dose Rate, or HDR, brachytherapy is a revolutionary new form of internal radiation which temporarily exposes abnormal tissue to a high amount of radiation. Under CT and fluoroscopy guidance, a bronchoscope is used to deliver a catheter into a position at the site of the bronchial tumor. The other end of this catheter is connected to a computerized machine. This machine passes a small radioactive metal pellet, or seed, through the catheter. Brachytherapy can also be used to treat prostate cancer and breast cancer.
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