TABLE II.

Fitting parameters (α, β), root-mean-square from the residual, and the mean value for h factor for each protocol-organ combination. The fitting parameters (α, β) and RMSE for h factor for the organs completely or partially inside the scan coverage in bold and for the organs outside the scan coverage in italic are shown here. [See the complete table in the supplementary material (Ref. 47)].

	(a) Chest and liver protocols
	Chest				Liver
Organ	Alpha	Beta	RMSEa	Meanb	Alpha	Beta	RMSE	Mean
Marrow	−0.06	0.90	0.03	0.375 ± 0.067	−0.05	−0.02	0.02	0.241 ± 0.045
Bones	−0.05	1.15	0.05	0.625 ± 0.103	−0.04	0.26	0.04	0.351 ± 0.067
Skin	−0.04	−0.02	0.02	0.251 ± 0.036	−0.02	−0.97	0.02	0.188 ± 0.022
Brain	−0.06	−2.25	0.00	0.016 ± 0.004	−0.11	−1.53	0.00	0.001 ± 0.000
Eyes	−0.09	−1.47	0.00	0.014 ± 0.004	−0.12	−1.30	0.00	0.001 ± 0.001
Larynx-pharynx	−0.03	0.27	0.17	0.484 ± 0.166	−0.12	−0.51	0.00	0.016 ± 0.007
Thyroid	−0.05	1.63	0.18	1.100 ± 0.229	−0.11	−0.27	0.01	0.032 ± 0.012
Trachea-bronchi	−0.06	2.03	0.11	1.236 ± 0.224	−0.01	−0.83	0.06	0.288 ± 0.063
Esophagus	−0.07	2.06	0.09	1.074 ± 0.209	−0.02	−0.32	0.06	0.438 ± 0.069
Lungs	−0.06	1.92	0.06	1.270 ± 0.197	−0.02	0.02	0.08	0.532 ± 0.085
Thymus	−0.05	1.97	0.12	1.384 ± 0.232	−0.11	0.46	0.07	0.212 ± 0.080
Breasts	−0.04	1.28	0.16	1.123 ± 0.196	−0.15	1.02	0.13	0.294 ± 0.198
Heart	−0.06	2.12	0.08	1.335 ± 0.228	−0.04	1.05	0.11	0.887 ± 0.164
Liver	−0.06	1.68	0.12	0.846 ± 0.179	−0.05	1.70	0.05	1.091 ± 0.204
Stomach	−0.06	1.59	0.14	0.908 ± 0.189	−0.06	1.82	0.07	1.110 ± 0.224
Spleen	−0.07	1.93	0.15	0.863 ± 0.214	−0.05	1.50	0.06	1.036 ± 0.181
Large Intestine	−0.04	−0.73	0.05	0.146 ± 0.055	−0.05	1.17	0.08	0.634 ± 0.142
Adrenals	−0.11	1.02	0.19	0.577 ± 0.211	−0.06	1.61	0.04	0.886 ± 0.178
Pancreas	−0.02	−0.17	0.20	0.562 ± 0.201	−0.07	1.94	0.04	1.007 ± 0.223
Small Intestine	−0.04	−0.7	0.06	0.157 ± 0.063	−0.06	1.63	0.13	0.800 ± 0.214
Kidneys	−0.18	2.21	0.13	0.296 ± 0.162	−0.07	1.93	0.07	0.957 ± 0.224
Gallbladder	−0.12	1.28	0.27	0.452 ± 0.314	−0.05	1.79	0.13	1.180 ± 0.248
Ovaries	−0.12	−0.83	0.00	0.005 ± 0.002	−0.26	2.86	0.01	0.054 ± 0.038
Uterus	−0.10	−1.66	0.00	0.004 ± 0.001	−0.25	3.02	0.01	0.043 ± 0.029
Vagina	−0.11	−1.61	0.00	0.002 ± 0.001	−0.26	3.27	0.00	0.014 ± 0.009
Bladder	−0.14	−0.24	0.00	0.002 ± 0.001	−0.24	2.45	0.01	0.023 ± 0.015
Prostate	−0.14	−0.23	0.00	0.001 ± 0.001	−0.23	2.43	0.00	0.012 ± 0.009
Testes	−0.10	−3.06	0.00	0.000 ± 0.000	−0.15	−0.55	0.00	0.002 ± 0.001
	(b) Liver-to-kidney and abdomen protocols
	L-to-K				Abdomen
Organ	Alpha	Beta	RMSE	Mean	Alpha	Beta	RMSE	Mean
Marrow	−0.03	−0.38	0.02	0.256 ± 0.038	−0.04	−0.06	0.03	0.292 ± 0.049
Bones	−0.03	−0.10	0.05	0.373 ± 0.062	−0.04	0.23	0.05	0.426 ± 0.074
Skin	−0.01	−1.31	0.02	0.203 ± 0.018	−0.01	−1.07	0.02	0.225 ± 0.022
Brain	−0.13	−0.85	0.00	0.001 ± 0.000	−0.13	−0.35	0.00	0.001 ± 0.000
Eyes	−0.14	−0.20	0.00	0.001 ± 0.001	−0.16	0.97	0.00	0.001 ± 0.001
Larynx- pharynx	−0.14	0.23	0.00	0.016 ± 0.007	−0.15	0.90	0.00	0.016 ± 0.007
Thyroid	−0.13	0.35	0.01	0.032 ± 0.013	−0.14	0.84	0.01	0.031 ± 0.012
Trachea-bronchi	−0.01	−0.82	0.06	0.288 ± 0.063	−0.02	−0.74	0.05	0.284 ± 0.055
Esophagus	−0.02	−0.31	0.07	0.440 ± 0.070	−0.02	−0.27	0.06	0.436 ± 0.070
Lungs	−0.02	0.02	0.08	0.533 ± 0.085	−0.02	0.08	0.07	0.528 ± 0.079
Thymus	−0.10	0.37	0.07	0.212 ± 0.080	−0.10	0.43	0.05	0.205 ± 0.056
Breasts	−0.21	2.18	0.13	0.295 ± 0.198	−0.25	3.12	0.13	0.284 ± 0.187
Heart	−0.04	1.05	0.11	0.889 ± 0.165	−0.04	1.07	0.11	0.885 ± 0.162
Liver	−0.05	1.64	0.05	1.099 ± 0.198	−0.05	1.64	0.05	1.106 ± 0.202
Stomach	−0.06	1.78	0.07	1.119 ± 0.221	−0.06	1.77	0.07	1.127 ± 0.224
Spleen	−0.05	1.45	0.06	1.044 ± 0.176	−0.05	1.44	0.06	1.051 ± 0.178
Large intestine	−0.03	0.58	0.10	0.714 ± 0.127	−0.04	1.03	0.12	0.855 ± 0.166
Adrenals	−0.05	1.52	0.03	0.902 ± 0.170	−0.05	1.51	0.04	0.914 ± 0.172
Pancreas	−0.06	1.84	0.04	1.025 ± 0.214	−0.06	1.84	0.04	1.042 ± 0.218
Small intestine	−0.04	1.02	0.13	0.900 ± 0.175	−0.05	1.42	0.12	1.057 ± 0.206
Kidneys	−0.06	1.70	0.05	1.005 ± 0.200	−0.06	1.69	0.04	1.031 ± 0.201
Gallbladder	−0.05	1.69	0.13	1.195 ± 0.241	−0.05	1.71	0.13	1.215 ± 0.247
Ovaries	−0.19	1.40	0.01	0.060 ± 0.020	−0.20	1.89	0.02	0.110 ± 0.037
Uterus	−0.16	0.86	0.01	0.048 ± 0.017	−0.18	1.56	0.02	0.089 ± 0.033
Vagina	−0.20	1.73	0.00	0.016 ± 0.006	−0.14	0.30	0.00	0.028 ± 0.008
Bladder	−0.16	0.62	0.01	0.031 ± 0.012	−0.17	1.27	0.02	0.057 ± 0.022
Prostate	−0.15	0.22	0.00	0.019 ± 0.007	−0.16	1.03	0.01	0.034 ± 0.014
Testes	−0.09	−2.63	0.00	0.003 ± 0.001	−0.10	−1.87	0.00	0.005 ± 0.002

^aRoot-mean-square of the residuals (RMSE) represents the average discrepancy between the h factor values predicted by using the fitting function and the h factor values calculated for individual patient. It has the same unit as h factor or organ dose.

^bMean represents the average value of the h-factor calculated for individual organs across all the patients. It has the same unit as h factor or organ dose.