Tilted gantry image correction for a multislice computed tomography system

摘要

The present invention allows for accurate reconstruction of images based on multislice CT system (10) scans using a tilted gantry (12). The present invention comprises a system and method for shifting the center of rotation of a reconstructed image into alignment with a longitudinal patient axis based on the tilt angle value. The present invention provides an algorithm to determine an offset amount for aligning the image. The offset amount is determined from a plurality of raw projection data used to formulate the image. The offset amount is provided for both axial and helical scanning and allows the reconstruction of an accurate image. Additionally, the system and method of the present invention provide a table speed offset and an indexing offset to account for the discrepancy in thickness of the x-ray beam at the longitudinal patient axis between tilted and non-tilted scans.