CT image producing method and x-ray CT apparatus

摘要

For the purpose of scanning a periodically moving subject to be imaged using a multi-row detector and producing a CT image at a desired phase with reduced cone-beam artifacts, the periodically moving subject to be imaged is scanned over a plurality of cycles while rotating an X-ray tube (21) and a multi-row detector (24) around the subject to be imaged and rectilinearly moving a table (12) supporting thereon the subject to be imaged; projection data collected in the same phase range in the plurality of cycles are extracted, the projection data being collected at a projection point onto which a pixel on a reconstruction plane is projected on a multi-row detector plane in a direction of X-ray transmission; and a CT image is produced based on the extracted projection data.