FIG. 4.

PSF of the wire images obtained with bilateral filtering ($w=5$, σ = 1.4) with the B70f kernel (left) and the B40f kernel without filtering (right) displayed in an large FOV of 50 mm (top row) and a small FOV of 5 mm (bottom row). The images have the same noise level at 16 HU, while the image with bilateral filtering has a much sharper appearance indicated by a sharper wire shape as well as a sharper noise texture.