Automatic point-wise validation of respiratory motion estimation

US9171377B2 · kind B2 · utility

Assignee

• KONINIKLIJKE PHILIPS N.V. · NL

Inventors

• Sven Kabus · Hamburg, DE
• Tobias Klinder · Uelzen, DE
• Cristian Lorenz · Hamburg, DE

Key dates

• Filing date: Jul 5, 2011
• Grant date: Oct 27, 2015
• Expiry date: Oct 4, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2207/10081
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A system for validating motion estimation comprising a field unit (110) for obtaining a deformation vector field (DVF) estimating the motion by transforming a first image at a first phase of the motion into a second image at a second phase of the motion, a metric unit (120) for computing a metric of a local volume change at a plurality of locations, and a conformity unit (130) for computing a conformity measure based on the computed metric of the local volume change at the plurality of locations and a local property of the first or second image defined at the plurality of locations. Based on the value of the conformity measure, the DFV estimating the motion is validated. Experiments show that the conformity measure based on the computed metric of a local volume change at a plurality of locations and the local property of the first or second image, defined at the plurality of locations, does not necessarily favor a large weight for the outer force to provide a more accurate registration. One reason for this observation may be that large deformations providing more accurate alignment often lead to deformations resulting in unreasonably large volume changes. DVFs comprising such defor…