Systems and methods for calibrating an alignment device

A method implemented on one system, including at least one processor and at least one storage, the method comprising:

• obtaining one or more projection images of a phantom having one or more surface indicators, the one or more surface indicators indicating a first coordinate system relating to the phantom, an origin of the first coordinate system overlapping with a calibration point of the phantom;
• determining a difference between the first coordinate system and a second coordinate system based on the one or more projection images, the second coordinate system being relating to a medical system;
• adjusting the phantom to an updated state according to the difference between the first coordinate system and the second coordinate system such that the first coordinate system overlaps with the second coordinate system;
• and
• adjusting an alignment device according to the one or more surface indicators in the updated state.

A non-transitory computer readable medium comprising executable instructions that, wherein when executed by at least one processor, the executable instructions cause the at least one processor to effectuate a method comprising:

• obtaining one or more projection images of a phantom having one or more surface indicators, the one or more surface indicators indicating a first coordinate system relating to the phantom, an origin of the first coordinate system overlapping with a calibration point of the phantom;
• determining a difference between the first coordinate system and a second coordinate system based on the one or more projection images, the second coordinate system being relating to a medical system;
• adjusting the phantom to an updated state according to the difference between the first coordinate system and the second coordinate system such that the first coordinate system overlaps with the second coordinate system;
• and
• adjusting an alignment device according to the one or more surface indicators in the updated state.