Method, computer system and CT system for determining a motion field and for motion-compensated reconstruction using said motion field

US9060733B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Herbert Bruder · Hemhofen, DE
• Christopher Rohkohl · Hattingen, DE

Key dates

• Filing date: Sep 25, 2012
• Grant date: Jun 23, 2015
• Expiry date: Aug 16, 2033

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B6/507
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method is disclosed for determining a motion field in an image space of a CT image data set for a partially and cyclically moving object, wherein a projection data set from a CT system covering a motion phase and a projection angle range is recorded, and an iterative determination of the motion field by minimizing a cost function from CT image data sets which are motion-compensated and reconstructed making use of motion fields and which have a first image resolution, with a first analytical reconstruction algorithm, the cost function being based on raw data or transformed into the image space. A method for generating a motion-compensated CT image data set for a partially and cyclically moving object is also disclosed, along with a computer system for image reconstruction and a CT system.