Table 16.

CTDI_vol-to-organ dose conversion coefficients (h factors, unitless) for the obese-class-I female phantom. The simulations were performed for the LightSpeed VCT scanner using a tube voltage of 120 kVp, a pitch of 1.375, a beam collimation of 40 mm, and large body scan field-of-view. CTDI_vol = 6.01 mGy/100 mAs. The h factors are in boldface for organs entirely inside the scan coverage.

	Chest-abdomen-pelvis	Chest	Abdomen-pelvis	Abdomen	Pelvis	Adrenals	Liver	Kidneys	Liver to kidneys	Kidneys to bladder	COV1
Eyes	0.02	0.02	0.002	0.002	0.0001	0.001	0.002	0.0008	0.002	0.001	–
Brain	0.02	0.02	0.002	0.002	0.0001	0.001	0.002	0.0009	0.002	0.001	–
Pharynx-larynx	0.67	0.67	0.02	0.02	0.001	0.01	0.02	0.01	0.02	0.01	–
Thyroid	1.25	1.24	0.05	0.05	0.001	0.02	0.05	0.02	0.05	0.02	0.4%
Trachea-bronchi	1.10	1.08	0.23	0.23	0.004	0.07	0.23	0.08	0.23	0.08	1%
Breasts	0.77	0.75	0.42	0.42	0.004	0.16	0.42	0.17	0.42	0.17	1.6%
Thymus	1.26	1.25	0.20	0.20	0.003	0.06	0.20	0.06	0.20	0.07	0.5%
Esophagus	0.90	0.88	0.26	0.26	0.01	0.10	0.26	0.11	0.26	0.11	2%
Lungs	1.05	1.02	0.48	0.48	0.01	0.17	0.48	0.18	0.48	0.18	2%
Heart	1.09	1.05	0.76	0.76	0.01	0.29	0.75	0.30	0.76	0.30	3%
Liver	0.85	0.66	0.77	0.76	0.04	0.57	0.75	0.62	0.76	0.64	5%
Gall bladder	1.06	0.81	0.92	0.91	0.05	0.77	0.89	0.83	0.90	0.85	9%
Spleen	0.84	0.71	0.75	0.75	0.03	0.59	0.74	0.62	0.74	0.63	6%
Stomach	0.96	0.76	0.90	0.89	0.04	0.73	0.88	0.77	0.88	0.78	3%
Pancreas	0.81	0.46	0.78	0.77	0.08	0.60	0.73	0.69	0.75	0.72	9%
Adrenal glands	0.74	0.46	0.69	0.68	0.06	0.55	0.65	0.61	0.67	0.63	9%
Kidneys	0.82	0.25	0.80	0.78	0.12	0.55	0.72	0.73	0.76	0.77	4%
Large intestine	0.86	0.13	0.84	0.60	0.47	0.30	0.45	0.47	0.49	0.82	3%
Small intestine	0.89	0.12	0.88	0.70	0.54	0.27	0.49	0.52	0.53	0.86	2%
Ovaries	0.71	0.003	0.75	0.07	0.76	0.01	0.02	0.03	0.03	0.73	3%
Uterus	0.79	0.002	0.81	0.05	0.79	0.01	0.01	0.02	0.02	0.77	2%
Bladder	0.79	0.001	0.73	0.03	0.73	0.004	0.01	0.02	0.02	0.68	6%
Vagina	0.76	0.001	0.72	0.02	0.71	0.002	0.01	0.01	0.01	0.61	9%
Residual soft tissues	0.44	0.14	0.36	0.18	0.25	0.08	0.13	0.13	0.15	0.30	–
Bone surface	0.89	0.45	0.61	0.34	0.36	0.15	0.27	0.22	0.30	0.50	–
Red bone marrow	0.58	0.29	0.41	0.25	0.22	0.11	0.20	0.17	0.23	0.34	–
Skin	0.38	0.16	0.29	0.16	0.17	0.07	0.13	0.11	0.14	0.23	–
COV2	18%	20%	9%	10%	5%	18%	11%	13%	10%	12%	–

¹Coefficient of variation (standard deviation × 100%/mean) across examination categories that covered the entire organ volume.

²Coefficient of variation (standard deviation × 100%/mean) across organs entirely inside the scan coverage.