Unified Patents is seeking prior art for all claims of US 8,553,831. In particular, Unified is seeking art that discloses the methods and/or systems covered by at least claims 1-20. The '831 patent, titled "Imaging system and method using primary and scattered radiations," generally relates to a computed tomography imaging systems used for medical diagnoses. Submitted documents for this project MUST: (1) if a patent reference, have a priority date before 9/19/2005, or if a non-patent reference, be publicly available before 9/19/2005; (2) include a PDF attachment (with or without annotations) for any submitted non-patent literature reference.