Objective To detect the methods and experience of CT guided interstitial 125I seed implantation treatment for head and neck malignant tumor. Methods 5 patients with head and neck malignant tumor were treated by interstitial 125I seed implantation with CT guide, 3 of them were treated with operation and adjunct seeds implantation, the other two patients were implanted seed only. According the treatment plan, register needles were punctured firstly, based on CT scan, these needle′s position and depth were adjusted, then the seeds were implanted into the target area. Another CT scan was done for the dose verification. Results The procedure of 125I seeds implantation of five patients was successful. 5 of twelve register needles were adjusted. The dose distribution of the instant verification was the same as that of treatment plan. Conclusion The CT guided seeds implantation of the head neck malignant tumors can practice the treatment plan accurately, and the dose verification can be done instantly.
