Fig. 4From: Needle artifact reduction during interventional CT procedures using a silver filterAxial CT images of the Lungman phantom with the needle inserted into the lung. The top row shows CT images reconstructed with a soft tissue window (ww/wl of 400/50) and the bottom row with a window for lung (ww/wl of 1700/− 700). Beam energy is indicated from left to right: 100 kV, 120 kV, 135 kV, and 120 kV with Ag additional filterBack to article page