Patent · US Active

Reconstruction for cone-beam computed tomography imaging with off-center flat panel detector

US9087404B2 · kind B2 · utility

27Cited by

9References

22Claims

0Family size

Assignee

KONINIKLIJKE PHILIPS N.V. · NL

Inventors

Eberhard Sebastian Hansis · Hamburg, DE
Dirk Schaefer · Hamburg, DE
Michael Grass · Hanstedt, DE

Key dates

Filing date	Apr 25, 2011
Grant date	Jul 21, 2015
Priority date	—
Expiry date	Mar 12, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG06T2211/432
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Computed tomography (CT) reconstruction includes reconstructing an axially extended reconstructed image from a measured cone beam x-ray projection data set (Pm), optionally having an off-center geometry. The reconstructing is performed for an extended volume (eFOV) comprising a reconstructable volume (rFOV) of the measured cone beam x ray data set that is extended along the axial direction. The projection data set may be weighted in the volume domain. Iterative reconstruction may be used, including initializing a constant volume and performing one or more iterations employing a first iterative update followed by one or more iterations employing a second, different iterative update. Alternatively, backprojection filtration (BPF) reconstruction may be used, including transforming the projection data set to a new geometry including finite differences between neighboring projection views and performing BPF using Hilbert filtering along a plurality of different directions and averaging the resultant reconstructed images to generate the final reconstructed image.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.