Patent Number: 
Section: claims

1. A radiation therapy apparatus, comprising:an inner layer comprising:a radiation delivery device configured to emit primary radiation, anda primary radiation shielding device configured to receive the primary radiation; andone or more rails mounted on an inner surface of the inner layer, wherein the radiation delivery device and the primary radiation shielding device are disposed on the one or more rails; anda treatment table disposed inside the one or more rails, wherein the treatment table is configured to rotate 360 degrees around a vertical axis and the one or more rails are configured to rotate around the treatment table to deliver 4π steradians of radiation coverage to a patient positioned on the treatment table; andan outer layer comprising a secondary radiation shielding device integrated into the radiation therapy apparatus and configured to block secondary radiation, the inner layer movable in relation to the outer layer, the outer layer comprising a cylinder-shaped section. 2. The apparatus of claim 1, wherein the one or more rails are disposed in a circular shape around a horizontal axis. 3. The apparatus of claim 2, wherein, the primary radiation shielding device is disposed opposite the radiation delivery device. 4. The apparatus of claim 3, wherein the apparatus is configured so that the radiation delivery device and the primary radiation shielding device rotate around the horizontal axis in synchrony with each other. 5. The apparatus of claim 1, wherein the treatment table is configured to slide in a longitudinal direction inside the cylinder-shaped section. 6. The apparatus of claim 1, further comprising telescoping legs coupled to the treatment table, the telescoping legs attaching the treatment table to an inner surface of the outer layer. 7. The apparatus of claim 1, wherein the treatment table is configured to move up and down in a vertical direction inside the cylinder-shaped section via the telescoping legs. 8. The apparatus of claim 1, wherein the one or more rails are configured to slide in a longitudinal direction inside the cylinder-shaped section. 9. The apparatus of claim 1, wherein the outer layer further comprises one or more doors coupled to the cylinder-shaped section. 10. The apparatus of claim 1, wherein the primary radiation shielding device is configured to block at least 99.9% of radiation incident upon the primary radiation shielding device. 11. The apparatus of claim 1, wherein the secondary radiation shielding device is configured to block at least 99.9% of radiation incident upon the secondary radiation shielding device. 12. The apparatus of claim 1, wherein the cylinder-shaped section of the outer layer comprises a cylindrical tube having a closable opening at one end of the cylindrical tube. 13. The apparatus of claim 12, wherein the cylindrical tube comprises one or more doors coupled to the cylindrical tube for covering and opening the closable opening. 14. The apparatus of claim 13, wherein the one or more doors coupled to the cylindrical tube are configured to enable entry into the radiation therapy apparatus through the closable opening in preparation for radiation therapy. 15. The apparatus of claim 13, further comprising a table system disposed inside the radiation therapy apparatus on a horizontal axis at a longitudinal center of the outer layer. 16. The apparatus of claim 15, wherein the cylindrical tube further comprises a second closeable opening and one or more doors coupled to the cylindrical tube for covering and opening the second closable opening. 17. The apparatus of claim 16, wherein a first door covers and opens the closable opening and a second door covers and opens the second closable opening, the first door and the second door configured to enable entry into the cylindrical tube through the first door and exit from the cylindrical tube through the second door. 18. The apparatus of claim 17, wherein the table system comprises a treatment table guide along which the treatment table may slide within the cylindrical tube. 19. The apparatus of claim 18, wherein the treatment table moves longitudinally over the treatment table guide along a horizontal axis inside the one or more rails as the radiation delivery device and the primary shielding device rotate azimuthally on the one or more rails. 20. The apparatus of claim 1, wherein the steradians are solid angle units describing a direction of primary radiation applied to the patient disposed on the treatment table.