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

Table 2

Execution time (in seconds).

	Single slice	Total volume (256 × 256 × 256)
	Backprojection	Filtering	Backprojection	Total
FDK	11.8	76.4	3020	3096.4
Hu’s term	5.6	2.3	1433.6	1435.9
Missing term	5.3	2.4	1356.8	1359.2
Hu’s algorithm	17.4	78.7	4453.6	4542.3
Zhu et al.’s algorithm	22.7	81.1	5811.2	5892.3
CFDKW-2	11	90	2816	2906
EM-2	16.3	92.4	4172.8	4265.2