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[Current consideration and future in radiotherapy].

The basic principle of radiotherapy for cancer patients is that it has the possibility of a good result (curability), tolerable and promises a comfortable life thereafter. Radiotherapy is the important tool for cancer by conserving the organ and function and by helping improve the quality of life. Radiotherapy must be planed on the basis of considering the therapeutic ratio with a 3-dimensional treatment planning technique which is an important role in radiotherapy because they are essential in target localization. Radiotherapy is leading the way in cancer treatment for today and tomorrow.