{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11478214","patent":{"patent_number":"US-11478214","title":"Geometric calibration for cone beam CT using line fiducials","assignee":null,"inventors":[],"filing_date":"2018-03-16T00:00:00.000Z","publication_date":"2022-10-25T00:00:00.000Z","cpc_codes":["A61B","A61B","A61B","A61B","A61B","A61B","G06T","G06T","G06T","G06T","G06T"],"num_claims":20,"abstract":"The present invention is directed to an alternative geometric calibration method based on a calibration phantom with multiple line-shaped markers. The markers can in some embodiments take the form of radio-opaque wires. Line fiducials overcome the occlusion hazards of spherical fiducials, because their projections overlap very mildly as long as the wires are mutually non-coplanar in 3D. This makes the phantom amenable to a wider range of orbits and less sensitive to phantom positioning. Equations relating the pose of 3D line-shaped objects to their 2D radiographic projections are then used as the basis for view-by-view geometry estimation. The technique can flexibly accommodate a wide range of different CT scan trajectories, including strongly noncircular trajectories known to provide better image quality than standard circular scans."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Geometric calibration for cone beam CT using line fiducials","description":"The present invention is directed to an alternative geometric calibration method based on a calibration phantom with multiple line-shaped markers. The markers can in some embodiments take the form of ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11478214","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-11478214","citation_suggestion":"Patentable. \"Geometric calibration for cone beam CT using line fiducials\" (US-11478214). https://patentable.app/patents/US-11478214","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11478214","json":"https://patentable.app/api/llm-context/US-11478214","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T04:41:31.842Z"}