Method and apparatus for motion correction in CT imaging

US10722178B2 · kind B2 · utility

Assignees

• WESTERN SYDNEY LOCAL HEALTH DISTRICT · AU
• The University of Sydney · AU
• Katholieke Universiteit Leuven, KU LEUVEN R&D · BE

Inventors

• Roger Fulton · Killara, AU
• Johan Nuyts · Heverlee, BE
• Tao Sun · Nanjing, CN
• Jung-Ha Kim · Seoul, KR

Key dates

• Filing date: May 30, 2017
• Grant date: Jul 28, 2020
• Expiry date: Sep 17, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2211/424
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A method for the reduction of motion artifacts in CT imaging, the method including the steps of: (a) reconstructing from the raw CT data an initial estimate of the object of interest; (b) estimating the pose of the object at each projection angle; (c) undertaking a motion-corrected reconstruction from the measured projections, accounting for the pose changes estimated in (b) by employing a modified source/detector orbit that accounts for the object motion; (d) iterating steps (b)-(c) until a predetermined convergence criterion is met; and (e) making a final reconstruction of the required image size using the pose estimates obtained in the previous steps.