Calibration method and apparatus for imaging device and imaging device

A calibration apparatus for an imaging device, comprising:

• a calculation module configured to calculate a first theoretical intersection line according to a theoretical target point position of a radiation source of the imaging device, a theoretical detection position of a detector, and a phantom position of a calibration phantom, wherein the first theoretical intersection line represents a propagation path formed within the calibration phantom after a connecting line between the theoretical target point position and the theoretical detection position passes through the calibration phantom;
• a determination module configured to determine first detection projection information for the calibration phantom based on the first theoretical intersection line, an attenuation coefficient of a radiation emitted by the radiation source in the calibration phantom, and a radiation energy spectrum distribution of the radiation source in the imaging device;
• and
• an adjustment module configured to adjust a parameter of the imaging device by using difference information between the first detection projection information and second detection projection information obtained by scanning the calibration phantom with the imaging device, so as to calibrate the imaging device and obtain a calibrated target parameter.