Table 4.

Relationship between organ dose conversion factors (h factors) and modulation control strength (α), h = a + bα + cα², for the abdomen-pelvis CT scan of the XCAT female reference phantom. mA modulation profiles are constrained.

	a	b	c	root-mean-square of residuals
inside
liver	1.265400	−0.638703	−0.120265	0.013013
gall bladder	1.400040	−0.689331	−0.147075	0.014794
stomach	1.209730	−0.672198	−0.077942	0.012249
spleen	1.263650	−0.588961	−0.148128	0.012853
pancreas	1.34700	−0.648606	−0.084329	0.012106
adrenal glands	1.190130	−0.635750	−0.076245	0.012666
kidney	1.374690	−0.654802	−0.119295	0.014253
large intestine	1.412100	−0.397288	0.029570	0.014533
small intestine	1.426140	−0.476319	−0.005086	0.014991
bladder	1.053540	−0.114844	0.885912	0.024355
ovaries	1.063560	0.136186	0.382991	0.014231
uterus	1.103640	−0.041237	0.673072	0.024415
periphery
lungs	0.456328	−0.300766	−0.002674	0.004738
breasts	0.418616	−0.277784	−0.003166	0.004772
esophagus	0.377211	−0.241031	−0.007022	0.004720
heart	0.707089	−0.482898	0.005874	0.007597
distributed
bone surface	0.850485	0.031005	0.079422	0.000547
red bone marrow	0.576685	−0.031726	0.056790	0.001729
skin	0.368457	0.007789	−0.003575	0.000163
residual soft tissue	0.483451	0.000660	0.033109	0.001171
outside
brain	0.000855	−0.000508	−0.000035	0.000012
thyroid	0.036194	−0.025852	0.001987	0.000417
larynx-pharynx	0.016331	−0.010476	0.000118	0.000300
thymus	0.157139	−0.100731	−0.003107	0.001711