The Physics of Three Dimensional Radiation Therapy presents a broad study of the use of three-dimensional techniques in radiation therapy. These techniques are used to specify the target volume precisely and deliver radiation with precision to minimize damage to surrounding healthy tissue. The book discusses multimodality computed tomography, complex treatment planning software, advanced collimation techniques, proton radiotherapy, megavoltage imaging, and stereotactic radiosurgery. A review of the literature, numerous questions, and many illustrations make this book suitable for teaching a course.The themes covered in this book are developed and expanded in Webb's The Physics of Conformal Radiotherapy and the two may be used together or in successive semesters for teaching purposes.