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Slices corresponding to the plane z = 6.0-mm (top row: a-c) and the plane z = 4.5-mm (bottom row: d-f) through the 3D-images of the six-tube phantom reconstructed from the 144-view data by use of the PLS-TV algorithm with varying regularization parameter β : (a), (d) β = 0.001; (b), (e) β = 0.05; and (c), (f) β = 0.1; All images are of size 19.8 × 19.8-mm2. The ranges of the grayscale windows were determined by the minimum and the maximum values in each image.
