Figure 7. (a) Magnified image of polymer tube I at a distance of 40 mm in Figure 6; the polymer tube was in the shoulder bone area. (b) Magnified image of polymer tube I at a distance of 150 mm in Figure 6; the polymer tube was in the lung area. (c) Magnified image of polymer tube I at a distance of 280 mm in Figure 6. The streak artefacts increased in the order of (b)<(a)<(c).