Beam hardening correction for CT perfusion measurements

US8279996B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thomas Allmendinger · Bad Kötzting, DE
• Marc Kachelrieß · Nuremberg, DE
• Bernhard Schmidt · Neunkirchen, DE
• Philip Stenner · Erlangen, DE

Key dates

• Filing date: Oct 28, 2010
• Grant date: Oct 2, 2012
• Expiry date: Oct 28, 2030

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 subject from measured data, wherein a series of measured data sets has previously been acquired during a relative rotational movement between a radiation source of a computed tomography system and the examination subject and the measured data sets relate to the same section of the examination subject at succeeding instants in time. In at least one embodiment, first image data is reconstructed in each case from the measured data sets such that a series of first image data is available. A change variable indicating a change over time within the series of first image data is determined, and a distinction is made between different components of the examination subject in the first image data with the aid of the change variable. This distinction is used for beam hardening correction in an iterative algorithm for calculating enhanced image data.