Image-guided radiation therapy (IGRT) is the process of frequent two and three-dimensional imaging, during a course of radiation treatment, used to direct radiation therapy utilizing the imaging coordinates of the approved radiation treatment plan. IGRT such as Cone-Beam CT (CBCT) using an On-Board Imager (OBI) enhance delivery and further improve outcomes as the treatments create a higher level of precision. By combining BNCT and IG-IMRT, we expect to procure high control rate of recurrent H & N cancer with acceptable toxicity. This study will be the first BNCT plus IG-IMRT trial to treat head and neck cancer in Taiwan.