Further developments in the technology will make photon more cost effective and considerably better than proton Kiyonari Inamura, AFOMP 1. Conventional photon modality is not necessarily 1. Conventional photon modality is not necessarily limited to IMRT. limited to IMRT. Ｆ ollowing modalities have excellent clinical Ｆ 2. ollowing modalities have excellent clinical 2. results such as: Real time tumor tracking in results such as: Real time tumor tracking in stereotactic radiotherapy by Shirato, stereotactic radiotherapy by Shirato, stereotactic body radiotherapy by Ngata, and etc. stereotactic body radiotherapy by Ngata, and etc. 3. New photon modalities such as micro ‐ ‐ beam beam 3. New photon modalities such as micro photon and dynamic robotics have future photon and dynamic robotics have future possibilities. possibilities.
Micro ‐ beam photon and robotics (Accucera, Japan) 6 axes rotations of small accelerator and patient support assembly ■ make irradiation from 4 π solid angle possible. ■ Electro ‐ magnetic scanning of photon micro ‐ beam can follow moving target volume Conventional Micro ‐ beam photon ■ Moving freedom 2 π plane 4 πsolid angle ■ iso ‐ center fixed free ■ accuracy １ mm 0.2mm ■ PSA axes 4 axes 6 axes 2
Micro beam photons (Accucera and University of Tokyo) Conventional 20 photon beams Micro beams photon of 20 rays Intensive concentration 3
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