GPU accelerated voxel-driven forward projection for iterative reconstruction of cone-beam CT

Table 3 Computation efficiency comparison of different methods

Projection frames/image matrix dimension	Method	Total time (s)	Average time (s)	Acceleration ratio
360/512^c	CPU^a	360 × 45	45	1
	GPU^b	214.97	0.597	75.36
	GPU^c	168.49	0.468	96.15
	GPU^d	153.499	0.426	105.54

^aCPU implementation on a single thread, ^b GPU acceleration with threads allocated in axial planes, ^c GPU acceleration without thread-plane interchange, ^d proposed GPU acceleration method

ISSN: 1475-925X