Table 2.
Relationship between organ dose conversion factors (h factors) and modulation control strength (α), h = a + bα + cα2, for the chest CT scan of the XCAT female reference phantom. mA modulation profiles are constrained.
| a | b | c | root-mean-square of residuals | |
|---|---|---|---|---|
| inside | ||||
| lungs | 1.375860 | −0.551437 | 0.190154 | 0.024848 |
| breasts | 1.141080 | −0.714861 | 0.059541 | 0.043005 |
| heart | 1.353670 | −0.766875 | 0.082191 | 0.046108 |
| thymus | 1.424480 | −0.584082 | 0.294456 | 0.026723 |
| periphery | ||||
| thyroid | 0.636686 | 1.251970 | 0.213765 | 0.219080 |
| esophagus | 1.141700 | −0.017802 | 0.240344 | 0.040624 |
| liver | 1.002990 | −0.493152 | −0.014561 | 0.041311 |
| gall bladder | 0.926471 | −0.443064 | −0.035577 | 0.041818 |
| stomach | 1.030640 | −0.560232 | 0.012905 | 0.041956 |
| spleen | 0.818472 | −0.365333 | −0.027094 | 0.033860 |
| pancreas | 0.556102 | −0.277750 | −0.006902 | 0.023673 |
| adrenal glands | 0.512740 | −0.238435 | −0.016311 | 0.021335 |
| large intestine | 0.210207 | −0.095756 | −0.009039 | 0.009465 |
| small intestine | 0.157911 | −0.079203 | −0.002574 | 0.006919 |
| distributed | ||||
| bone surface | 0.593390 | 0.046099 | 0.044261 | 0.011857 |
| red bone marrow | 0.397753 | −0.086233 | 0.059646 | 0.002418 |
| skin | 0.234989 | 0.011149 | −0.003015 | 0.000617 |
| residual soft tissue | 0.241694 | 0.007750 | 0.008835 | 0.002210 |
| outside | ||||
| brain | 0.010950 | 0.016294 | −0.000802 | 0.001700 |
| larynx-pharynx | 0.163409 | 0.199425 | 0.036355 | 0.031569 |
| kidneys | 0.211393 | −0.098434 | −0.004630 | 0.008683 |
| bladder | 0.001772 | −0.000954 | 0.000062 | 0.000061 |
| ovaries | 0.003298 | −0.000848 | −0.000713 | 0.000138 |
| uterus | 0.002645 | −0.001307 | −0.000022 | 0.000081 |