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Mobile C-arm for intraoperative CBCT. The isocentric C-arm nominally acquires CBCT data from a (untilted) semi-circular half-scan orbit in rotation angle θ = 0°–196° (yellow circle). Such an orbit can also be acquired at a specified gantry tilt angle (ϕ, marked in blue). Computer-controlled motorization of both θ and ϕ during the scan allows non-circular orbits that may improve sampling characteristics and MAA performance.
