We intend to investigate the clinical application of two emerging imaging modalities for which the technical capability is currently in place at Mayo Clinic. The treatment of Ewing Sarcoma (ES), Rhabdomyosarcoma (RMS) and soft tissue sarcoma (STS) patients on this study will involve multi-disciplinary contributions from nationally recognized sarcoma experts in Radiation Oncology, Radiology, Orthopedic Surgery, Pediatric Oncology, Medical Oncology and Pathology.