http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8249213-B2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_69cf27afbfd4d559d811f7d1ed293e57 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b7317808024e524eea40a6c5a5ad6a22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_eb3bad370d22fc06ae24f3ac45700617 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61B6-027 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61B6-583 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01D18-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61B6-00 |
| filingDate | 2009-08-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2012-08-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ddd95c8de598ef9a9ad6717b18802eed http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5b54ece2682ce29f15b5c7f79803fdd2 |
| publicationDate | 2012-08-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-8249213-B2 |
| titleOfInvention | Calibration method for ring artifact correction in non-ideal isocentric 3D rotational X-ray scanner systems using a calibration phantom based rotation center finding algorithm |
| abstract | The present invention refers to 3D rotational X-ray imaging systems for use in computed tomography (CT) and, more particularly, to a fast, accurate and mathematically robust calibration method for determining the effective center of rotation (I) in not perfectly isocentric 3D rotational C-arm systems and eliminating substantially circular ring artifacts (RA) which arise when using such a CT scanner system for acquiring a set of 2D projection images of an object of interest to be three-dimensionally reconstructed. For this purpose, a C-arm based rotational CT scanner comprising at least one radiation detector (D) having an X-radiation sensitive surface exposed to an X-ray beam emitted by at least one X-ray tube (S), each rotating along a non-ideal circular trajectory (T F , T CD ) about an object of interest to be three-dimensionally reconstructed from a set of 2D projection images is used for providing geometrical calibration data by scanning a calibration phantom from a plurality of distinct projection directions and calculating, for each projection direction, the 3D positions of the X-ray tube's focal spot and the X-ray detector's center. For approximating the exact 3D position and angular direction of the axis of rotation about which the at least one X-ray tube and the at least one radiation detector rotate, a circular regression technique using a number of mathematically robust least squares fits is applied. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11109825-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11141128-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10517553-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9398890-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11490872-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2018279980-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2014211925-A1 |
| priorityDate | 2008-08-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 31.