Patent · US Active

Method for correction of artifacts arising from temporal changes of attenuation values

US8588497B2 · kind B2 · utility

1Cited by

1References

11Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Frank Dennerlein · Forchheim, DE
Andreas Fieselmann · Erlangen, DE

Key dates

Filing date	Aug 31, 2011
Grant date	Nov 19, 2013
Priority date	—
Expiry date	Nov 30, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG06T2211/421
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A method for correcting artifacts in an image dataset reconstructed by filtered back projection is proposed. The artifacts are occurred as a result of temporal changes of attenuation values during rotational recording of X-ray projection images with an angular speed. A linear, analytically-derived, filter-type relationship between the attenuation values of the image dataset at a reference point and the real attenuation values is determined from the sum of a respective application of an angle speed-dependent weighting factor, a point spread function and a temporal derivation, evaluated at the reference time. The linear relationship is inverted and the inverted linear relationship is applied to the attenuation values of the image dataset for the correction.

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