The goal of radiation therapy treatment planning is to maximize the radiation dose to tumor while minimizing the dose to surrounding healthy tissue. This text provides the radiation therapist with step-by-step instructions on how to perform the technical aspects of radiation therapy, compute dose calculation, and execute effective treatment planning. The second edition is widely expanded and includes new coverage of treatment preparation, 3-D treatment planning, dosimetry, the latest equipment, documentation and quality assurance. Treatment simulation and treatment planning guidelines are provided by body region (head and neck, thorax, pelvis, etc.) for easy access to material in the clinical setting.