Table 3.
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 unconstrained.
| a | b | c | root-mean-square of residuals | |
|---|---|---|---|---|
| inside | ||||
| liver | 1.61430 | −0.411973 | −0.167074 | 0.004215 |
| gall bladder | 1.395170 | −0.458111 | −0.189514 | 0.004049 |
| stomach | 1.05970 | −0.459071 | −0.126999 | 0.004046 |
| spleen | 1.59430 | −0.3640 3 | −0.194097 | 0.003788 |
| pancreas | 1.230780 | −0.434770 | −0.139968 | 0.003932 |
| adrenal glands | 1.186910 | −0.430694 | −0.128970 | 0.004947 |
| kidney | 1.370560 | −0.410191 | −0.182816 | 0.005064 |
| large intestine | 1.407040 | −0.208729 | −0.149568 | 0.002937 |
| small intestine | 1.40980 | −0.267179 | −0.160579 | 0.003264 |
| bladder | 1.041400 | 0.004044 | 0.034654 | 0.001295 |
| ovaries | 1.056160 | 0.156678 | −0.010919 | 0.003653 |
| uterus | 1.09850 | 0.033794 | 0.007512 | 0.000836 |
| periphery | ||||
| lungs | 0.45480 | −0.211854 | −0.027479 | 0.001445 |
| breasts | 0.417106 | −0.193100 | −0.026206 | 0.001582 |
| esophagus | 0.37595 | −0.168005 | −0.027486 | 0.001846 |
| heart | 0.704750 | −0.343900 | −0.034815 | 0.002675 |
| distributed | ||||
| bone surface | 0.850058 | 0.019129 | 0.033545 | 0.000399 |
| red bone marrow | 0.575945 | −0.020934 | 0.012577 | 0.000023 |
| skin | 0.368490 | 0.006185 | −0.002013 | 0.000092 |
| residual soft tissue | 0.48944 | 0.003821 | 0.000771 | 0.000005 |
| outside | ||||
| brain | 0.000852 | −0.000330 | −0.000085 | 0.000007 |
| thyroid | 0.035969 | −0.017929 | −0.001177 | 0.000146 |
| larynx-pharynx | 0.016384 | −0.008650 | 0.000640 | 0.000038 |
| thymus | 0.156648 | −0.069301 | −0.013086 | 0.000694 |