Computerized tomography method with helical relative movement and conical beam

US7430270B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Claas Bontus · Hamburg, DE
• Thomas Kohler · Neuenstadt am Kocher, DE

Key dates

• Filing date: Jun 9, 2005
• Grant date: Sep 30, 2008
• Expiry date: Jun 9, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T11/005
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention relates to a computerized tomography method, wherein a radiation source executes an nPi relative movement along a helix with respect to an object. Acquired measured values are partially derived according to the angular position of the radiation source on the helix and intermediate filter values are generated by filtering the derived measured values along the filter lines with a k filter. Each intermediate filter value is multiplied by a filter factor, where the filter factor for intermediate filter values that have been generated by filtering the derived measured values along filter lines, which run exclusively within the Pi window, is greater than or equal to those filter factors by which the intermediate filter values are multiplied, which have been generated by filtering the derived measured values along filter lines, which run inside as well as outside the Pi window. The intermediate filter values assigned to a measured value are added to a filter value and the filter values are back-projected for reconstruction of a CT image.