Table 2: Execution time (in seconds).

Single sliceTotal volume (256 × 256 × 256)
BackprojectionFiltering BackprojectionTotal

FDK11.876.430203096.4
Hu’s term5.62.31433.61435.9
Missing term5.32.41356.81359.2
Hu’s algorithm17.478.74453.64542.3
Zhu et al.’s algorithm22.781.15811.25892.3
CFDKW-2119028162906
EM-216.392.44172.84265.2