A system, comprising: a computer-readable storage medium storing a set of instructions for CT image reconstruction; a processor in communication with the computer-readable storage medium, wherein when executing the set of instructions, the system is directed to: obtain a raw data set related to an object; generate a first image set by image reconstruction based on the raw data set, wherein the first image set includes a first full quality image and a max field of view image, both the first full quality image and the max field of view image are obtained by reconstruction of the raw data set, by varying the field of view parameter, and the max field of view image has a larger field of view than the first full quality image; generate a hard tissue corrected image by removing hard tissue from the first full quality image, by changing pixel values of pixels representing the hard tissue, based on the max field of view image; generate a plurality of reference images based on reconstruction parameters, wherein the reconstruction parameters include a slice thickness or a slice increment; generate a first bone information image by stacking a first number of the plurality of reference images; generate a second image set by image reconstruction based on the raw data set, wherein the second image set includes a second full quality image, wherein the first full quality image and the second full quality image are reconstructed by different reconstruction parameters, wherein the reconstruction parameters include a slice thickness or a slice increment; generate a second bone information image by changing the reconstruction parameters by stacking a second number of reference images; and generate a beam hardening artifact corrected image by correcting beam hardening artifact of the second full quality image, by changing pixel values of pixels representing the beam hardening artifact, based on the second bone information image. a computer-readable storage medium storing a set of instructions for CT image reconstruction; a processor in communication with the computer-readable storage medium, wherein when executing the set of instructions, the system is directed to: obtain a raw data set related to an object; generate a first image set by image reconstruction based on the raw data set, wherein the first image set includes a first full quality image and a max field of view image, both the first full quality image and the max field of view image are obtained by reconstruction of the raw data set, by varying the field of view parameter, and the max field of view image has a larger field of view than the first full quality image; generate a hard tissue corrected image by removing hard tissue from the first full quality image, by changing pixel values of pixels representing the hard tissue, based on the max field of view image; generate a plurality of reference images based on reconstruction parameters, wherein the reconstruction parameters include a slice thickness or a slice increment; generate a first bone information image by stacking a first number of the plurality of reference images; generate a second image set by image reconstruction based on the raw data set, wherein the second image set includes a second full quality image, wherein the first full quality image and the second full quality image are reconstructed by different reconstruction parameters, wherein the reconstruction parameters include a slice thickness or a slice increment; generate a second bone information image by changing the reconstruction parameters by stacking a second number of reference images; and generate a beam hardening artifact corrected image by correcting beam hardening artifact of the second full quality image, by changing pixel values of pixels representing the beam hardening artifact, based on the second bone information image. obtain a raw data set related to an object; generate a first image set by image reconstruction based on the raw data set, wherein the first image set includes a first full quality image and a max field of view image, both the first full quality image and the max field of view image are obtained by reconstruction of the raw data set, by varying the field of view parameter, and the max field of view image has a larger field of view than the first full quality image; generate a hard tissue corrected image by removing hard tissue from the first full quality image, by changing pixel values of pixels representing the hard tissue, based on the max field of view image; generate a plurality of reference images based on reconstruction parameters, wherein the reconstruction parameters include a slice thickness or a slice increment; generate a first bone information image by stacking a first number of the plurality of reference images; generate a second image set by image reconstruction based on the raw data set, wherein the second image set includes a second full quality image, wherein the first full quality image and the second full quality image are reconstructed by different reconstruction parameters, wherein the reconstruction parameters include a slice thickness or a slice increment; generate a second bone information image by changing the reconstruction parameters by stacking a second number of reference images; and generate a beam hardening artifact corrected image by correcting beam hardening artifact of the second full quality image, by changing pixel values of pixels representing the beam hardening artifact, based on the second bone information image.