Result of cine-CBCT image (one breathe cycle) reconstruction from a full-fan scan with randomly permuted projection angels. (a) Restored cine-CBCT image with the relative error 5.39%. From left to right: frame 50, 120, 190, 260, 330. Display window is (−1000,420) HU. (b) Absolute value of the differences to the ground truth. The display window is (0,710) HU. (c) Columns of L. Each column is reshaped into an image. (d) Rows of R.