Fig. 1

Image fusion result of IOCT and POCT, and assessment of the fusion. Each row shows three perpendicular reconstructed planes from a same CT. A: IOCT; B: Image overlay of IOCT and POCT. The target vertebra (centered) is fused. Note that the adjacent vertebra (white arrow) cannot be fused simultaneously because of the inter-segmental movement, thus it shows double edges of cortical bone; C: POCT