Method for reconstructing a three-dimensional image of an object scanned in the context of a tomosynthesis, and apparatus for tomosynthesis

US6442288B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Wolfgang Haerer · Erlangen, DE
• Guenter Lauritsch · Ergolding, DE
• Michael Zellerhoff · Forchheim, DE

Key dates

• Filing date: Dec 7, 1998
• Grant date: Aug 27, 2002
• Expiry date: Dec 7, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2211/436
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method for reconstruction of a three-dimensional image of an object scanned in linear or circular fashion in the context of a tomosynthesis. The object is transirradiated with X-rays from various projection angles &phgr; for the recording of the projection images, and the radiation exiting from the object is recorded by a detector that supplies digital output image signals. The output image signals representing the projection image data are supplied to a computer for image reconstruction. In the context of the reconstruction a filter is first produced, on the basis of the following steps: A 3D transmission function Hproj(&ohgr;x,&ohgr;y,&ohgr;z) is calculated from the recording geometry for the individual projection image recording and the back-projection of the individual projection images into the 3D reconstruction image volume. By approximation, the 3D transmission function Hproj(&ohgr;x,&ohgr;y,&ohgr;z) is inverted for the determination of an inversion function Hinv(&ohgr;x,&ohgr;y,&ohgr;z). A 3D filtering function Hopt(&ohgr;x,&ohgr;y,&ohgr;z) is produced dependent on one or more desired image characteristics of the reconstruction image. A resulting 3D filtering function …