Method and apparatus for computed tomography image reconstruction

US8787646B2 · kind B2 · utility

Assignee

• KONINIKLIJKE PHILIPS N.V. · NL

Inventors

• Dirk Schaefer · Hamburg, DE
• Michael Grass · Hanstedt, DE

Key dates

• Filing date: Feb 18, 2010
• Grant date: Jul 22, 2014
• Expiry date: May 22, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B6/027
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method and apparatus are provided to reconstruct projection data obtained from CT imaging devices with offset detector geometries. According to one aspect of the present invention, a method is provided to reconstruct projection data obtained from CT imaging devices with offset detector geometries that includes the following steps: (i) matching projection data measured at opposing sides of the acquisition trajectory and splicing them together to generate a full, non-truncated projection data set; (ii) differentiation of the projection data; (iii) filtering the differentiated projection data with a filter, such as for example a Hilbert filter; (iv) applying redundancy weighting to the filtered projection data; and (v) back-projecting the redundancy weighted projection data to generate image data.