Method and image reconstruction device for reconstructing image data

US7940884B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Herbert Bruder · Hemhofen, DE
• Thomas Flohr · Uehlfeld, DE
• Rainer Raupach · Heroldsbach, DE
• Karl Stierstorfer · Erlangen, DE
• John Sunnegårdh · Erlangen, DE

Key dates

• Filing date: Mar 23, 2010
• Grant date: May 10, 2011
• Expiry date: Mar 23, 2030

Classification

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

Abstract

A method and an image reconstruction device are disclosed for reconstructing image data on the basis of input projection data obtained via an X-ray computerized tomography system. A target convolutional kernel is selected, which, when reconstructing image data from the input projection data using simple filtered back projection, would lead to target image characteristics. Image data is then reconstructed using an iterative reconstruction method of at least one embodiment. In at least one embodiment, the method includes a) reconstructing image data of a first iterative stage from the input projection data, b) generating synthetic projection data on the basis of the image data of the current iterative stage, c) forming difference projection data on the basis of the input projection data and the synthetic projection data, d) generating residue image data from the difference projection data, e) combining the residue image data with the image data of the current iterative stage to form image data of an additional iterative stage, wherein the image data of the current iterative stage is subjected to filtering before or during combination with the residue image data by using a regularizat…