TABLE III.

Comparison of SNU, CDR, and CDR increase ratio on the 15 patient CBBCT datasets without and with scatter correction. Note that the VGF values, estimated via the KFCM method, are listed for reference only. They are not used in the proposed library-based scatter correction.

			Coronal view (x–z)					Sagittal view (x–y)
Patient #	Deff (cm)	VGF (%)	SNU (%) (before/after)		CDR (before/after)		CDR increase ratio	SNU (before/after)		CDR (before/after)		CDR increase ratio
1	14	41	6.43	1.07	5.32	6.77	1.27	7.49	2.87	4.28	5.27	1.23
2	14	5	11.92	2.83	2.56	5.48	2.14	14.07	2.12	3.02	8.66	2.86
3	14	18	7.41	3.38	6.76	10.07	1.49	20.18	2.32	1.16	8.52	7.32
4	14	14	6.79	2.70	6.80	9.12	1.34	11.48	3.15	5.01	5.70	1.14
5	14	7	5.66	1.90	5.47	7.50	1.37	6.59	3.34	4.71	7.17	1.52
6	14	16	7.89	2.99	4.06	5.93	1.46	11.74	3.09	3.72	6.31	1.70
7	14	13	13.03	3.30	4.91	6.44	1.31	8.64	2.17	6.56	7.65	1.17
8	14	34	5.24	3.10	5.23	7.35	1.41	9.38	2.98	4.60	6.28	1.36
9	12	15	5.19	2.15	5.17	7.36	1.42	11.02	1.55	4.92	7.74	1.57
10	18	12	12.62	2.82	2.45	6.69	2.73	16.18	6.89	2.38	5.97	2.51
11	10	7	5.20	1.93	9.47	12.94	1.37	9.73	2.13	5.11	9.42	1.84
12	10	1	2.96	1.92	5.08	6.72	1.32	5.60	4.79	4.72	6.53	1.38
13	14	19	4.35	1.70	7.51	9.60	1.28	9.81	2.18	4.73	7.61	1.61
14	10	15	6.65	3.23	6.14	6.18	1.01	4.42	2.72	6.93	7.71	1.11
15	16	21	5.78	1.96	6.43	9.21	1.43	5.84	3.07	1.88	6.58	3.50
Average			7.14	2.47	5.56	7.82	1.49	10.14	3.02	4.25	7.14	2.12
STD			2.94	0.68			0.40	4.10	1.26			1.54