Research of the relationship between dose distribution and given dose in the sequestrum of the patients with head and neck tumors treated by carbon-ion radiotherapy

We carried out about sequestrum caused by carbon-ion radiotherapy of the patients with head and neck tumors. There were 13 patients who were operated of sequestrotomy at Ichikawa General Hospital, Tokyo Dental College from 2000 to 2009. We compared the CT images of nine out of thirteen patients to investigate the dose distribution. Six out of nine patients, the area of sequestrotomy were corresponded with the highest dose area. We studied the progress of 3 cases treated by maxillofacial prostheses that were retained with maxillofacial implant at carbon-ion radiationtherapy area. (author)