Control systems and methods

1. A system for controlling movement of a table supporting an object, comprising:

a first control sub-system configured to generate a first control instruction;

a second control sub-system configured to generate a second control instruction;

a table control sub-system operably coupled to the table; and

a master controller configured to

receive the first control instruction from the first control sub-system, or the second control instruction from the second control sub-system,

generate a third control instruction based on the first control instruction or the second control instruction, and

transmit the third control instruction to the table control sub-system,

wherein the table control sub-system is configured to

generate a control signal based on the third control instruction, and

cause the table to move based on the control signal,

wherein the first control sub-system is operably connected to the second control sub-system via a virtual table motion controller,

the virtual table motion controller is configured to relay the first control instruction from the first control sub-system to the second control sub-system; and

the second control sub-system is configured to relay the first control instruction to the master controller.

2. The system of claim 1 , wherein

the first control sub-system is further configured to transmit first clock synchronization information associated with the first control sub-system to the master controller; and

the master controller is further configured to update time information associated with the master controller according to the first clock synchronization information.

3. The system of claim 1 , wherein

the second control sub-system is further configured to transmit second clock synchronization information associated with the second control sub-system to the master controller; and

the master controller is further configured to update time information associated with the master controller according to the second clock synchronization information.

4. The system of claim 1 , wherein

the first control sub-system is operably coupled to a first device,

the second control sub-system is operably coupled to a second device, and

the table is configured to move between the first device and the second device.

5. The system of claim 4 , wherein

the first device is an imaging device, and the second device is a treatment device, or

the first device is an imaging device of a first modality, and the second device is an imaging device of a second modality, the first modality being different from the second modality.

6. The system of claim 1 , wherein the first control sub-system and the master controller have a point-to-point connection.

7. The system of claim 6 , wherein the point-to-point connection includes a peripheral component interconnect express (PCIE) connection.

8. The system of claim 6 , wherein a latency time between the master controller and the first control sub-system is less than 10 microseconds.

9. The system of claim 6 , wherein the table control sub-system is further configured to

determine movement information of the table; and

transmit the movement information to the master controller.

10. The system of claim 9 , wherein the master controller is further configured to

transmit the movement information to the second control sub-system.

11. The system of claim 9 , wherein the second control sub-system is further configured to

determine whether the table is under a control of the first control sub-system;

in response to determining that the table is under the control of the first control sub-system, transmit the movement information to the first control sub-system via the point-to-point connection.

12. The system of claim 1 , wherein

the master controller is a virtual master node, the first control sub-system is operably connected to the second control sub-system or the master controller via a virtual table motion controller.