Treatment planning with head and neck immobilization shell

Techniques of conducting treatment planning with use of immobilization device for head and neck tumors are described. We have used a thermo-plasticity polyester ratin (Thermosplint) which is a lowtemperature splint material allowing one-step fabrication of the immobilization shell. Accuracy of positioning and field localization with using the shell was studied to be practically within satisfactory level. However, it was felt that further improvement of shell material should be done for more precise positioning. (author)