Patent · US Active

Back-projection of a projection image data set with depth-dependent filtering

US8630474B2 · kind B2 · utility

1Cited by

0References

6Claims

0Family size

Assignees

Siemens Aktiengesellschaft · DE
University of Utah Research Foundation · US

Inventors

Frank Dennerlein · Forchheim, DE
Frederic Noo · Salt Lake City, US

Key dates

Filing date	Jun 29, 2012
Grant date	Jan 14, 2014
Priority date	—
Expiry date	Jun 29, 2032

Classification

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

Abstract

For filtered back-projection of a projection image data set, the projection image data set is cosine-weighted. The cosine-weighted projection image data set within the image plane of the projection image data set is subjected to a two-dimensional Radon transformation. The Radon transform of the cosine-weighted projection image data set differentiated with respect to the distance from an image origin of an image coordinate system. The derivative of the Radon transform is redundancy-weighted. The redundancy-weighted derivative is subjected to a two-dimensional Radon back-transformation. The Radon back-transform is differentiated and back-projected with respect to an image column coordinate. A differentiation step width entering into the differentiation is varied depending on depth.

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