Patent Number: 
Section: claims

1. A radiation system, comprising:a first support;a first structure rotatably coupled to the first support so that the first structure is rotatable about a first axis relative to the first support;a second structure rotatably coupled to the first structure so that the second structure is rotatable about a second axis that forms a non-zero angle relative to the first structure; anda first radiation source connected to the second structure;wherein the first structure and the second structure are parts of a container comprising a cavity for accommodating at least a portion of a patient, wherein the container comprises a wall portion that intersects a longitudinal axis of the patient, wherein the wall portion is a part of the first structure and/or a part of the second structure. 2. The system of claim 1, wherein the first structure comprises a first space, the second structure comprises a second space, and the first space and the second space are configured to collectively form the cavity to accommodate the at least a portion of the patient. 3. The system of claim 1, wherein the first radiation source is configured to rotate within a rotational plane about the second axis by rotating the second structure relative to the first structure about the second axis; andwherein an angle between the rotational plane and the first axis is adjustable by rotation of the first structure about the first axis. 4. The system of claim 1, further comprising a beam stopper connected to the second structure. 5. The system of claim 1, wherein the first radiation source is configured to deliver treatment energy. 6. The system of claim 1, further comprising:a second radiation source connected to the second structure; andan imager connected to the second structure;wherein the first radiation source is configured to deliver treatment radiation;wherein the second radiation source is configured to deliver diagnostic radiation; andwherein the first radiation source, the second radiation source, and the imager are rotatable relative to the first structure by movement of the second structure. 7. The system of claim 1, wherein the second structure includes a shielding material that is configured to block at least 98% of radiation resulted from an operation of the first radiation source. 8. A radiation system, comprising:a first support;a first structure rotatably coupled to the first support so that the first structure is rotatable about a first axis relative to the first support;a second structure rotatably coupled to the first structure so that the second structure is rotatable about a second axis that forms a non-zero angle relative to the first structure; anda first radiation source connected to the second structure;wherein the first structure and the second structure are parts of a capsule comprising a cavity for accommodating at least a portion of a patient; andwherein the radiation system further comprises a third structure rotatably coupled to the second structure, wherein the second structure is rotatable relative to both the first and the third structures about the second axis. 9. The system of claim 8, further comprising a second support for supporting the third structure. 10. The system of claim 8, wherein the first structure and the third structure are configured to rotate simultaneously relative to the second structure, or vice versa. 11. A radiation system, comprising:a first support;a first structure rotatably coupled to the first support so that the first structure is rotatable about a first axis relative to the first support;a second structure rotatably coupled to the first structure so that the second structure is rotatable about a second axis that forms a non-zero angle relative to the first structure; anda first radiation source connected to the second structure;wherein the first structure and the second structure are parts of a capsule comprising a cavity for accommodating at least a portion of a patient; andwherein the first structure has an interface plane that interfaces with the second structure, the interface plane forming an acute angle with respect to the first axis. 12. A radiation system, comprising:a first support;a first structure rotatably coupled to the first support so that the first structure is rotatable about a first axis relative to the first support;a second structure rotatably coupled to the first structure so that the second structure is rotatable about a second axis; anda first radiation source connected to the second structure;wherein the first radiation source is configured to rotate within a rotational plane about the second axis by rotating the second structure relative to the first structure about the second axis; andwherein an angle between the rotational plane and the first axis is adjustable by rotation of the first structure about the first axis. 13. The system of claim 12, wherein the first structure comprises a first space, the second structure comprises a second space, and the first space and the second space are configured to collectively accommodate at least a portion of a patient. 14. The system of claim 12, wherein the first radiation source is configured to deliver treatment energy. 15. The system of claim 12, further comprising:a second radiation source connected to the second structure; andan imager connected to the second structure;wherein the first radiation source is configured to deliver treatment radiation;wherein the second radiation source is configured to deliver diagnostic radiation; andwherein the first radiation source, the second radiation source, and the imager are rotatable relative to the first structure by movement of the second structure. 16. The system of claim 12, wherein the second structure includes a shielding material that is configured to block at least 98% of radiation resulted from an operation of the first radiation source. 17. A radiation system, comprising:a first support;a first structure rotatably coupled to the first support so that the first structure is rotatable about a first axis relative to the first support;a second structure rotatably coupled to the first structure so that the second structure is rotatable about a second axis; anda first radiation source connected to the second structure;wherein the first radiation source is configured to rotate within a rotational plane about the second axis by rotating the second structure relative to the first structure about the second axis;wherein an angle between the rotational plane and the first axis is adjustable by rotation of the first structure about the first axis; andwherein the radiation system further comprises a third structure rotatably coupled to the second structure, wherein the second structure is rotatable relative to both the first and the third structures about the second axis. 18. The system of claim 17, further comprising a second support for supporting the third structure. 19. The system of claim 17, wherein the first structure and the third structure are configured to rotate simultaneously relative to the second structure, or vice versa. 20. A radiation system, comprising:a first support;a first structure rotatably coupled to the first support so that the first structure is rotatable about a first axis relative to the first support;a second structure rotatably coupled to the first structure so that the second structure is rotatable about a second axis; anda first radiation source connected to the second structure;wherein the first radiation source is configured to rotate within a rotational plane about the second axis by rotating the second structure relative to the first structure about the second axis;wherein an angle between the rotational plane and the first axis is adjustable by rotation of the first structure about the first axis; andwherein the first structure has an interface plane that interfaces with the second structure, the interface plane forming an acute angle with respect to the first axis.