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Stereotactic radiosurgery had been developed in the early sixties in Sweden, and recently adapted at Karolinska Institute to treat the inoperable neoplasms of the chest, abdomen and pelvis. The new method uses a specially designed stereotactic body frame, which is a device equipped with feducial markers. The patient is positioned inside the body frame with the area of interest within the boundaries of the feducial markers. These allow for the localization of the tumor to be treated and the exact positioning of an isocenter, which is essential for the successful administration of multiple treatments. The method for patient repositioning as suggested by the Karolinska Hospital, Stockholm is the use of a vacuum bag, which although efficient in patient immobilization, has certain inherent risks. At Staten Island University Hospital we proposed to use a custom fitted rigid body mold. The material used is RediFoam Immobilization System, a two part MDI-based rigid urethane system. When the ingredients are properly mixed the chemical reaction results in a custom impression of the patients contours. Its rigid structure will not be altered by normal use thereby insuring patient immobilization and replication. The system allows to use a smaller number of SBF and provides substantial cost effectiveness.