Patent ID: 11875430
Assignee: SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  A | IPC A  G

Claim 0:
1. A method for synthesizing a projection image, the projection image representing a subject or object irradiated by X-rays from a radiation source, the method comprising:
dividing an energy spectrum of the X-rays into one or more energy bins, the energy spectrum of the X-rays varying with respect to different regions of the projection image, each of the one or more energy bins corresponding to an energy range;
for at least one pixel of the projection image,
for each energy bin of the one or more energy bins,
determining a projection value of the at least one pixel indicating a transmission projection of X-rays corresponding to the at least one pixel and having an energy within the corresponding energy range of the energy bin;
determining a weighting coefficient corresponding to the energy bin based on a variation of the energy spectrum of the X-rays between the different regions of the projection image; and
determining a weighted projection value of the at least one pixel based on the projection value of the at least one pixel and the weighting coefficient corresponding to the energy bin; and

determining a pixel value of the at least one pixel based on the weighted projection values of the at least one pixel that correspond to all of the one or more energy bins.