Apparatus and method for establishing a correction characteristic curve for a reduction of artefacts in tomography

US6975697B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Stefan Kasperl · Erlangen, DE
• Ulf Hassler · Heilsbronn, DE
• Ingo Bauscher · Nuremberg, DE
• Stefan Schroepfer · Oberasbach, DE

Key dates

• Filing date: Jun 4, 2004
• Grant date: Dec 13, 2005
• Expiry date: Jun 4, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01T1/2985
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An apparatus and method for establishing a correction characteristic curve for a reduction of artefacts in a tomography are described. Projection data of the object is provided, wherein the projection data comprises transmission values for the object. A representation of the object is calculated from the projection data to obtain two or three-dimensional representation data for the object. A measure for the transmission length of the object is determined by using the representation data. A transmission value, which is associated to the determined measure for the transmission length, is determined and the correction characteristic curve of several determined measures is generated for transmission lengths and associated transmission values, wherein a precorrection of the projection data can be performed by using the determined correction characteristic curve, to iteratively determine the correction characteristic curve by using the precorrected transmission values.