Method for correcting truncation artifacts

US8107708B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Stefan Hoppe · Berching, DE
• Joachim Hornegger · Effeltrich, DE
• Günter Lauritsch · Nuremberg, DE

Key dates

• Filing date: Jul 8, 2008
• Grant date: Jan 31, 2012
• Expiry date: Nov 30, 2030

Classification

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

Abstract

The invention relates to a method for correcting truncation artifacts in a reconstruction method for computed tomography recordings. The projection images are recorded by an x-ray image detector being extended by determining the attenuation of the radiation outside the projection image for pixels. Non-horizontal filter lines are extended by transaxial and axial artificial extension of the x-ray image detector for the purposes of truncation correction. The truncation correction for non-horizontal filter lines being carried out according to a method from at least one of the following groups: truncation correction takes place regardless of the specific location and orientation of the filter lines; truncation correction takes place as a function of the specific position and orientation of the filter lines, with the filter lines themselves being retained; and truncation correction takes place by introducing new modified filter lines, with filtering taking place along offset artificially extended filter lines.