Figure 1.

(A) The extremity CBCT system in a weight-bearing configuration. The scanner utilizes a three-source x-ray unit that enables single-scan DE imaging (source and detector rotate inside the gantry marked with a dashed box). (B) Geometry of the multisource x-ray unit. The DE protocol considered here involves the peripheral sources (S1 and S3) operated at low kV (LE) and the central source (S2) operated at high kV (HE). Sources fire in a sequential pattern; the area indicated by the darkest triangle is sampled by all three beams. Imaging performance is assessed in a multi-material insert (see Sec. 2.2.1 and Sec. 2.2.2) represented by the dark inner cylinder (metal hardware is marked in green); the insert is completely within the area illuminated by all three beams.