Method and device for determining images from X-ray projections

US8619944B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Frank Dennerlein · Forchheim, DE
• Stefan Hoppe · Berching, DE
• Markus Kowarschik · Koblenzer Straße, DE
• Holger Scherl · Bad Hersfeld, DE

Key dates

• Filing date: May 3, 2010
• Grant date: Dec 31, 2013
• Expiry date: Aug 27, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2211/421
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and a device for determining attenuation coefficients for an object using a movable X-ray source and a detector, which is provided for recording projections, is provided. The method includes specifying a trajectory for the movable X-ray source, specifying positions on the trajectory for determining a derivative of projections recorded by the detector, specifying a plurality of scanning positions for each of the specified positions, following the trajectory with the X-ray source and recording a projection for each scanning position, numerically calculating a projection derivative in relation to the trajectory path for each of the positions using the projections recorded for the associated plurality of scanning positions, and determining attenuation coefficients for the object from the calculated projection derivatives using a theoretically exact or approximate rule for the reconstruction.