SPIRAL CT SYSTEM AND RECONSTRUCTION METHOD

摘要

A spiral cone beam CT reconstruction method, comprising the steps of: on the basis of the pitch of a spiral cone beam CT system and of the distance between rows of a multi-row probe, calculating the smallest number of probe rows required to cover the Tam window (S61); if the number of probe rows of the spiral cone beam CT system is less than said smallest number of probe rows, performing weighting on complementary projection data to compensate for missing projection data (S62); rearranging the compensated projection data into cone-angled collimated-beam data (S63); performing cone-angle cosine weighting on the rearranged collimated-beam data, and then performing one-dimensional filtering along the row direction of a virtual probe that is defined upon said rearrangement into collimated-beam data (S64); and, performing an unweighted cone-angled collimated-beam reverse projection on the filtered data to obtain a reconstructed image (S65). A spiral cone beam CT system is also provided.