| 摘要 |
An artifact correcting image reconstruction apparatus includes a reconstruction processor ( 70 ) that reconstructs acquired projection data ( 60 ) into an uncorrected reconstructed image ( 74 ). A classifying processor ( 78 ) classifies pixels of the uncorrected reconstructed image ( 74 ) at least into high, medium, and low density pixel classes. A pixel replacement processor ( 88 ) replaces pixels of the uncorrected reconstructed image ( 74 ) that are of the high density and low density classes with pixel values of the low density pixel class to generate a synthetic image ( 90 ). A forward projecting processor ( 94 ) forward projects the synthetic image ( 90 ) to generate synthetic projection data ( 96 ). A projection replacement processor ( 100, 110 ) replaces acquired projection data ( 60 ) contributing to the pixels of the high density class with corresponding synthetic projection data ( 96 ) to generate corrected projection data ( 112 ). The reconstruction processor ( 70 ) reconstructs the corrected projection data ( 112 ) into a corrected reconstructed image ( 120 ). |
