FDK-Type Algorithms with No Backprojection Weight for Circular and Helical Scan CT

Figure 6

Slices of Shepp-Logan low-contrast phantom at 𝑥=0. Illustration of axial intensity drop due to large value of pitch 0.5m in full-scan reconstruction (a) standard helical FDK. (b) HFDKW-1 algorithm and (c) HFDKW-2 algorithm. Display window is [11.04].

(a)

(b)

(c)