To improve the outcome and decrease the adverse effects in radiotherapy, clinical application of following novel techniques is under investigation: clinical investigation of IMRT and stereotactic radiotherapy; incorporating the biological tumor characteristics into 3-D conformal radiotherapy by MR- and PET/CT image fusion; minimizing the set-up error by the imageguided radiotherapy system using kV-cone beam CT; optimizingirradiation fields by monitoring the respiratory movement with the 4-D CT-based radiotherapy planning system.

1. A:PET/CT image fusion-based radiotherapy for hepatocellular carcinoma
2. B:IMRT for prostatic cancer
3. C,D:Stereotacitic radiotherapy for lung cancer