Iterative reconstruction of CT images without a regularization term

US8718343B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Herbert Bruder · Hemhofen, DE
• Martin Petersilka · Wiesendorf, DE
• Rainer Raupach · Heroldsbach, DE
• Karl Schwarz · Roth, DE

Key dates

• Filing date: May 19, 2011
• Grant date: May 6, 2014
• Expiry date: Jan 23, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2211/424
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method is disclosed for reconstructing image data of an examination object from measured data, wherein the measured data was captured previously during a relative rotary motion between a radiation source of a computed tomography system and the examination object. In at least one embodiment, the measured data is modified to achieve a particular grayscale characteristic of the image data to be reconstructed. The image data is calculated by way of an iterative algorithm using the modified measured data, wherein no arithmetic step for reducing noise is employed in the iterations.