Method for reconstruction of a three-dimensional image data set and x-ray device

US8428216B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Frank Dennerlein · Forchheim, DE
• Bernhard Scholz · Heroldsbach, DE

Key dates

• Filing date: Jul 6, 2011
• Grant date: Apr 23, 2013
• Expiry date: Nov 8, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2211/432
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method for reconstruction of a three-dimensional image data set from projection images of an object captured with an X-ray device from different projection angles is proposed. At least one sub-area of the object is outside the coverage of the X-ray device, or as a result of strong attenuation by a metal so that no projection data is present in the sub-area. Filter lines are determined n the projection images. A first local transformation is performed along the filter lines on the projection images. The missing projection data on the transformed projection data is augmented. A non-local transformation is performed on the transformed projection data for determining of filtered, augmented projection data. The non-local transformation is different from a ramp filter which is created by the first local transformation and the non-local transformation. The three-dimensional image data set is determined by back-projection of the filtered, augmented projection data.