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1. (WO2019002450) MOVING FLOOR FOR RADIOTHERAPY SYSTEM WITH CANTILEVER GANTRY ASSEMBLY
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WHAT IS CLAIMED IS:

1. A radiotherapy system comprising:

an accelerator configured to provide a particle beam with an initial energy;

a support member operable to be coupled to an external supporting structure;

a cantilever gantry assembly coupled to said accelerator and said support member and comprising a gantry beamline configured to transport said particle beam, wherein said cantilever gantry assembly is configured to be supported by said support member in a cantilevered manner;

a beam nozzle coupled to said cantilever gantry assembly and configured to irradiate said particle beam onto a target object; and

a moving floor configured to:

support a person;

move in a lateral plane in synchronization with rotation of said cantilever gantry assembly and perpendicular to a rotation axis of said cantilever gantry assembly; and

during movement in said lateral plane, maintain an opening that allows said beam nozzle to protrude therefrom and toward said target object when said cantilever gantry assembly is located below said lateral plane during rotation.

2. The radiotherapy system of Claim 1 further comprising a track configured to be affixed to an external wall and to support the moving floor, wherein said track comprises a continuous rail comprising a lateral portion configured to guide said moving floor to move in said lateral plane.

3. The radiotherapy system of Claim 2, wherein the moving floor comprises two floor sections each configured to move in said lateral plane, and wherein further said opening is variable and corresponds to a gap between said two floor sections.

4. The radiotherapy system of Claim 2, wherein said continuous rail further comprises a non-lateral portion bent upward from said lateral portion and configured to guide said moving floor to move above said lateral plane.

5. The radiotherapy system of Claim 2, wherein said continuous rail further comprises a non-lateral portion bent downward from said lateral portion and configured to guide said moving floor to move below said lateral plane.

6. The radiotherapy system of Claim 3, wherein each floor section comprises a plurality of floor segments interconnected in sequence by bogies, and wherein further each of said plurality of floor segments is configured to be supported by said continuous rail in a cantilevered manner through said bogies.

7. The radiotherapy system of Claim 6, wherein each bogie is mounted on a pivot between floor segments wherein said bogie comprises rollers disposed on an outer surface of said continuous rail in three different angles, and wherein further said rail is a tubular rail.

8. The radiotherapy system of Claim 3 further comprising a respective drive motor and a respective brake that are coupled to said track and configured to control each floor section.

9. The radiotherapy system of Claim 1 , wherein said support member comprises a bearing configured to enable said cantilever gantry assembly to rotate around an iso-center of said radiotherapy system in a range between -190° and 190°.

10. The radiotherapy system of Claim 1 further comprising a counterweight coupled to said cantilever gantry assembly and disposed proximate to said support member, wherein said cantilever gantry assembly comprises a rigid housing configured to support a weight of said cantilever gantry assembly.

1 1. A radiotherapy system comprising:

a gantry assembly configured to rotate around a rotational axis;

a beam nozzle coupled to said gantry assembly and configured to irradiate a particle beam onto a target object; and

a floor assembly comprises:

a flexible floor configured to support a person present thereon; and a track configured to be affixed to an external wall and to support said flexible floor, wherein said track comprises:

a lateral portion configured to guide said flexible floor to move in a lateral plane; and

non-lateral portions bent upward from said lateral portion and configured to guide said flexible floor to move above said lateral plane, wherein said floor assembly is configured to: maintain an opening in said flexible floor that allows said beam nozzle to protrude therefrom and toward said target object; and cause said opening to move in synchronization with rotation of said gantry assembly.

12. The radiotherapy system of Claim 1 1, wherein said track is a closed continuous loop and has substantially a "D"-like shape.

13. The radiotherapy system of Claim 1 1 , wherein said gantry assembly comprises: a support member operable to be coupled to an external supporting structure; and a gantry arm coupled to said support member and comprising a gantry beamline configured to transport said particle beam;

a drum comprising a bearing and configured to be coupled to a counterweight, wherein said counterweight is operable to balance said gantry assembly during rotation in a cantilevered manner.

14. The radiotherapy system of Claim 1 1 , wherein said track comprises: a loop chassis configured to be affixed to said external directly; and a rail coupled to said loop chassis and said flexible floor.

15. The radiotherapy system of Claim 14, wherein the flexible floor comprises two floor sections, and wherein further said opening is variable and corresponds to a gap between said two floor sections.

16. The radiotherapy system of Claim 14 further comprising bogies, wherein each floor section comprises a chain of floor segments that are configured to be interconnected by said bogies and supported by said rail in a cantilevered manner through said bogies.

17. The radiotherapy system of Claim 16, wherein each bogie is mounted on a pivot between floor segments, and wherein further each bogie comprises rollers disposed on an outer surface of said rail in three different orientations.

18. The radiotherapy system of Claim 17 further comprising a respective drive motor and a respective brake that are coupled to said track and configured to control each floor section.

19. The radiotherapy system of Claim 16, wherein each floor segment is made of sheet metal and comprises: a substantially rectangular panel; and three substantially triangular panels.

20. The radiotherapy system of Claim 1 1, wherein said rotation axis of said gantry assembly is above said lateral plane, and wherein further said gantry assembly is configured to rotate in a range at least 360° around said rotation axis.

21. The radiotherapy system of Claim 14, wherein the flexible floor comprises a single floor section and flaps, wherein said opening is formed between two ends of said single floor section, and wherein said flaps are configured to cover said opening partially as said opening varies in size.