Title:
CORRECTION OF NON-LINEARITIES IN AN IMAGING SYSTEM BY MEANS OF A PRIORI KNOWLEDGE IN RADIOGRAPHY
Document Type and Number:
WIPO Patent Application WO2006094493
Kind Code:
A3
Abstract:
The invention relates to a method for online correction of non-linearities in the imaging systemn during the data acquisition in industrial computer tomography (CT). The above provides a method for the provision of corrected projection data as an improved CT reconstruction, whereby measuring beams (q) are emitted from a radiation source (Q) which pass through the sample (10,11), the intensity of which is recorded by a detector (31). The following steps are provided: a first initialisation, whereby a first orientation of the sample (10) is merely coarsely determined with a first rapid recording, a recording in which the position of the sample (10) is more accurately determined, in particular by feature point pairs, a movement, whereby after a successful recording of several projections, the position of the sample (10,11) is calculated for at least one further projection, a simulation, whereby a virtual CT is carried out using the results from the previous step, providing input data for an ensuing correction method for the CT reconstruction, carrying out a correction, whereby during data recording (70) by the detector, parameters are determined from the correction data and a correction is then carried out (73a,73b) and the reconstruction, whereby in the period at the end of the recording process corrected projection data (11*) as a data recording (70) are provided as an improved CT reconstruction (74,75).
Inventors:
KASPERL STEFAN (DE)
BAUSCHER INGO (DE)
FRANZ MATTHIAS (DE)
SCHROEPFER STEFAN (DE)
BAUSCHER INGO (DE)
FRANZ MATTHIAS (DE)
SCHROEPFER STEFAN (DE)
Application Number:
PCT/DE2006/000420
Publication Date:
November 16, 2006
Filing Date:
March 09, 2006
Export Citation:
Assignee:
FRAUNHOFER GES FORSCHUNG (DE)
KASPERL STEFAN (DE)
BAUSCHER INGO (DE)
FRANZ MATTHIAS (DE)
SCHROEPFER STEFAN (DE)
KASPERL STEFAN (DE)
BAUSCHER INGO (DE)
FRANZ MATTHIAS (DE)
SCHROEPFER STEFAN (DE)
International Classes:
G01T1/29
Foreign References:
| US20040066908A1 | 2004-04-08 | |||
| US4302675A | 1981-11-24 | |||
| US4969110A | 1990-11-06 | |||
| US6047041A | 2000-04-04 |
Other References:
KOENIG A ET AL: "OBJECT POSE ESTIMATION USING A SET OF LOCAL RADIOGRAPHS OF A PART AND ITS CAD MODEL", REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, no. 16, 28 July 1996 (1996-07-28), pages 829 - 836, XP001069375
GRAEME P PENNEY ET AL: "A Comparison of Similarity Measures for Use in 2-D-3-D Medical Image Registration", IEEE TRANSACTIONS ON MEDICAL IMAGING, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 17, no. 4, August 1998 (1998-08-01), XP011035760, ISSN: 0278-0062
GRAEME P PENNEY ET AL: "A Comparison of Similarity Measures for Use in 2-D-3-D Medical Image Registration", IEEE TRANSACTIONS ON MEDICAL IMAGING, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 17, no. 4, August 1998 (1998-08-01), XP011035760, ISSN: 0278-0062
Download PDF: