CT Metal Artifact Reduction Method Based on Improved Image Segmentation and Sinogram In-Painting

Table 3

Computation cost (in CPU seconds) for each steps in the Bal algorithm and the proposed correction method.

		ClinicalImage1	ClinicalImage2	ClinicalImage3	PhantomImage
Bal’s Method in [7]	Pre-filtering step	0.98	0.97	0.96	0.97
	Segmentation step	67.23	23.44	24.21	14.13
	Inpainting step	1.32	1.57	1.22	0.85
	Total	69.53	25.98	26.39	15.95
Proposed correction (unparallelized)	Pre-filtering step	237.56	236.92	237.17	236.32
	Segmentation step (metal)	34.45	26.26	28.34	12.39
	Segmentation step (artifacts)	26.21	16.96	16.92	4.93
	Inpainting step	44.02	49.09	64.78	52.81
	Total	342.24	329.23	347.21	306.45
Proposed correction (CUDA parallelized)	Pre-filtering step	6.23	5.97	6.39	5.98
	Segmentation step (metal)	34.45	26.26	28.34	12.39
	Segmentation step (artifacts)	26.21	16.96	16.92	4.93
	Inpainting step	1.42	1.58	2.06	1.74
	Total	33.86	24.51	25.37	12.65