Abstract:Beam hardening happens when medical X- Cfi machine is used in core analysis; therefore,projection data must be preprocessed to correct Cor remove)the beam hardening before the image reconstruction. In the case of undercorrection,marginal Cfi data are on the high side,and mid ones the low side. However,overcorrection resalts in a contrary situation. Requirements for both the hardwares of X- CT machine and the image processing softwares are defined in order to improve core analysis accuracy. The beam hardening can be removed by first preprocessing raw data in the X-Cfi machine,then reconstructing the images. fihe atomic number and electron density distributions of a substance can be obtained by using dual erergy iteration and two sets of data which have been respectively produced after two scannings under different voltages. Thus,beam hardening is removed,and mufti-solution phenomenon is reduced.