Table 1. The comparison of the computational time cost of the proposed method and the conventional method.

Methods	Number of used detector point (patterns)	Computational time
Conventional method	11215	17.4 min
Proposed method	16	0.8 s
	32	1.3 s
	64	2.4 s
	128	4.7 s
	256	7.6 s
	512	9.8 s
	1024	11.6 s