Iterative method of determining a spatial distribution of values of a property

US7394927B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Roland Proksa · Hamburg, DE
• Thomas Kohler · Neuenstadt am Kocher, DE

Key dates

• Filing date: Apr 26, 2004
• Grant date: Jul 1, 2008
• Expiry date: Jun 23, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2211/424
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An iterative method determines a spatial distribution of values of a property of an object, and particularly values of its absorption, in an examination region, on the basis of measured values that values are acquired with a measuring device, and particularly with a computer tomograph. The reliability of each measured value is taken into account when this is done. The measured values can each be represented as a sum of values of the property that have each been multiplied by a proportional factor, the proportional factor being a measure of the proportion that a value of the property forms of the measured value. Each value of the property is approached by one iteration value at a time by setting each iteration value to a starting value and, in an iteration step, generating for each measured value a reference measured value, forming the difference between each reference measured value and the corresponding measured value, and multiplying this difference by a reliability parameter and projecting it backward into the examination region.