Contrast-dependent regularization strength in the iterative reconstruction of CT images

US9498177B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Herbert Bruder · Hemhofen, DE
• Thomas Flohr · Uehlfeld, DE
• Rainer Raupach · Heroldsbach, DE
• Martin Sedlmair · Zirndorf, DE
• Heinrich Wallschlager · Erlangen, DE

Key dates

• Filing date: Mar 23, 2010
• Grant date: Nov 22, 2016
• Expiry date: Jun 24, 2033

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, the measured data being captured during a rotating movement of a radiation source of a computed tomography system around the examination object. In at least one embodiment, different iteration images of the examination object are determined successively from the measured data by way of an iterative algorithm, wherein with the iterative algorithm the current iteration image at any one time is high-pass-filtered and weighted as a function of contrast using a variable which contains contrast information relating to the current iteration image at that time.