Table 12.

CTDI_vol-to-organ dose conversion coefficients (h factors, unitless) for the normal-weight male 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-kidney	Kidney-to-bladder	COV1
Eyes	0.01	0.02	0.001	0.001	0.0001	0.0004	0.001	0.0003	0.001	0.0005	–
Brain	0.02	0.02	0.001	0.001	0.0001	0.0005	0.001	0.0004	0.001	0.001	–
Pharynx-larynx	0.50	0.50	0.01	0.01	0.0003	0.004	0.01	0.004	0.01	0.004	–
Thyroid	1.21	1.21	0.02	0.02	0.0005	0.01	0.02	0.01	0.02	0.01	–
Trachea-bronchi	1.44	1.42	0.29	0.29	0.004	0.08	0.29	0.07	0.29	0.07	1%
Breasts	1.55	1.54	0.13	0.13	0.002	0.04	0.13	0.03	0.13	0.03	0.3%
Thymus	1.55	1.53	0.22	0.21	0.003	0.07	0.21	0.06	0.21	0.06	0.7%
Esophagus	1.28	1.24	0.49	0.49	0.01	0.23	0.49	0.19	0.49	0.20	2%
Lungs	1.49	1.45	0.59	0.59	0.01	0.21	0.58	0.17	0.58	0.17	2%
Heart	1.51	1.46	1.03	1.03	0.01	0.37	1.02	0.27	1.02	0.28	2%
Liver	1.35	1.09	1.24	1.23	0.04	0.93	1.21	0.92	1.21	0.96	5%
Gall bladder	1.37	0.73	1.50	1.49	0.08	1.26	1.45	1.21	1.44	1.28	8%
Spleen	1.37	1.03	1.31	1.30	0.04	1.10	1.29	1.10	1.27	1.14	7%
Stomach	1.48	1.19	1.42	1.41	0.05	1.17	1.40	1.14	1.38	1.18	8%
Pancreas	1.29	0.87	1.23	1.22	0.07	0.98	1.19	1.03	1.18	1.08	8%
Adrenal glands	1.13	0.83	1.05	1.04	0.05	0.84	1.02	0.90	1.01	0.94	9%
Kidneys	1.27	0.45	1.24	1.23	0.12	0.87	1.17	1.07	1.14	1.17	6%
Large intestine	1.39	0.17	1.39	0.99	0.77	0.39	0.71	0.65	0.68	1.35	2%
Small intestine	1.46	0.28	1.43	1.18	0.73	0.50	0.89	0.75	0.83	1.41	2%
Prostate	0.92	0.002	0.93	0.04	0.91	0.003	0.01	0.01	0.01	0.79	7%
Bladder	1.20	0.002	0.99	0.05	1.03	0.004	0.02	0.01	0.01	1.05	8%
Testes	1.22	0.001	1.53	0.01	1.46	0.001	0.003	0.002	0.002	0.35	11%
Residual soft tissues	0.62	0.23	0.46	0.22	0.32	0.08	0.17	0.12	0.15	0.36	–
Bone surface	1.28	0.64	0.86	0.49	0.52	0.19	0.36	0.24	0.35	0.70	–
Red bone marrow	0.84	0.42	0.59	0.36	0.34	0.14	0.27	0.18	0.26	0.48	–
Skin	0.39	0.21	0.28	0.22	0.11	0.09	0.18	0.12	0.17	0.22	–
COV2	12%	8%	16%	11%	26%	16%	12%	12%	12%	18%	–

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.