A shoulder immobilization apparatus/device which allows simultaneous immobilization of shoulders in both anterior/posterior directions as well as superior/inferior direction using shoulder straps (belts). The straps are attached to a base board. The base board is configured to be used in conjunction with standard components including: treatment couch, head support boards, head support, thermoplastic masks, and indexing bars. The device uses only low attenuation components in the treatment area. The use of nonconductive materials makes the device suitable for use with MRI machines.
