X-ray imaging system for radiation therapy

An imaging method implemented on a machine having one or more processors and one or more storage devices, the method comprising:

• causing a treatment head of a radiation treatment system to deliver, according to a treatment plan, a treatment beam to an object, the treatment beam providing a maximum treatment radiation region;
• causing a plurality of imaging radiation sources and one or more first detectors of the radiation treatment system to be positioned outside the maximum treatment radiation region so as not to interfere with the treatment beam, at least one of the plurality of imaging radiation sources being positioned at an edge of the maximum treatment radiation region,
• wherein when the treatment head is delivering the treatment beam to the object along a first direction, the first direction being along a central axis of the treatment beam emitted from the treatment head and distal to the treatment head, the at least one of the plurality of imaging radiation sources is positioned so that the at least one of the plurality of imaging radiation sources delivers an imaging beam along a second direction, the second direction being along a central axis of the imaging beam emitted from the at least one of the plurality of imaging radiation sources and distal to the at least one of the plurality of imaging radiation sources, a difference between the first direction and the second direction is less than 30 degrees;
• causing the plurality of imaging radiation sources to deliver first imaging beams to the object while the treatment head is delivering the treatment beam to the object;
• acquiring a first data set generated by the one or more first detectors by detecting at least a portion of the first imaging beams;
• and
• generating an image of the object based on the first data set.

An imaging system, comprising:

• at least one storage device including a set of instructions;
• at least one processor in communication with the at least one storage device, wherein when executing the set of instructions, the at least one processor is configured to cause the system to perform operations including:
• causing a treatment head of a radiation treatment system to deliver, according to a treatment plan, a treatment beam to an object, the treatment beam providing a maximum treatment radiation region;
• causing a plurality of imaging radiation sources and one or more first detectors of the radiation treatment system to be positioned outside the maximum treatment radiation region so as not to interfere with the treatment beam, at least one of the plurality of imaging radiation sources being positioned at an edge of the maximum treatment radiation region,
• wherein when the treatment head is delivering the treatment beam to the object along a first direction, the first direction being along a central axis of the treatment beam emitted from the treatment head and distal to the treatment head, the at least one of the plurality of imaging radiation sources is positioned so that the at least one of the plurality of imaging radiation sources delivers an imaging beam along a second direction, the second direction being along a central axis of the imaging beam emitted from the at least one of the plurality of imaging radiation sources and distal to the at least one of the plurality of imaging radiation sources, a difference between the first direction and the second direction is less than 30 degrees;
• causing the plurality of imaging radiation sources to deliver first imaging beams to the object while the treatment head is delivering the treatment beam to the object;
• acquiring a first data set generated by the one or more first detectors by detecting at least a portion of the first imaging beams;
• and
• generating an image of the object based on the first data set.