Table 2.
Correlation coefficients between DLP and body size indices.
| Region | Scanner | Correlation Coefficients | |||||
|---|---|---|---|---|---|---|---|
| WED (cm) |
ED (cm) |
Weight (kg) |
W/H (kg/m) |
BMI (kg/m2) |
BSA (m2) |
||
| T | Siemens | 0.819 | 0.847 | 0.893 | 0.827 | 0.676 | 0.902 |
| GEa | 0.933 | 0.941 | 0.938 | 0.912 | 0.806 | 0.924 | |
| GEb | 0.914 | 0.938 | 0.923 | 0.896 | 0.757 | 0.910 | |
| Fujifilm | 0.959 | 0.954 | 0.912 | 0.902 | 0.819 | 0.890 | |
| A | Siemens | 0.945 | 0.933 | 0.919 | 0.938 | 0.897 | 0.876 |
| GEa | 0.950 | 0.944 | 0.896 | 0.906 | 0.842 | 0.866 | |
| GEb | 0.959 | 0.947 | 0.906 | 0.910 | 0.852 | 0.883 | |
| Fujifilm | 0.962 | 0.945 | 0.884 | 0.884 | 0.818 | 0.861 | |
| AP | Siemens | 0.922 | 0.913 | 0.922 | 0.911 | 0.819 | 0.904 |
| GEa | 0.969 | 0.961 | 0.919 | 0.926 | 0.860 | 0.892 | |
| GEb | 0.969 | 0.961 | 0.916 | 0.921 | 0.859 | 0.894 | |
| Fujifilm | 0.968 | 0.959 | 0.930 | 0.946 | 0.889 | 0.895 | |
| TAP | Siemens | 0.921 | 0.919 | 0.937 | 0.923 | 0.834 | 0.914 |
| GEa | 0.964 | 0.959 | 0.951 | 0.942 | 0.834 | 0.919 | |
| GEb | 0.965 | 0.961 | 0.939 | 0.943 | 0.858 | 0.906 | |
| Fujifilm | 0.975 | 0.969 | 0.951 | 0.944 | 0.846 | 0.930 | |
| T | All | 0.906 | 0.920 | 0.917 | 0.884 | 0.765 | 0.907 |
| (0.061) | (0.049) | (0.019) | (0.039) | (0.065) | (0.014) | ||
| A | All | 0.954 | 0.942 | 0.901 | 0.909 | 0.852 | 0.871 |
| (0.008) | (0.006) | (0.015) | (0.022) | (0.033) | (0.010) | ||
| AP | All | 0.957 | 0.948 | 0.922 | 0.926 | 0.857 | 0.896 |
| (0.023) | (0.024) | (0.006) | (0.015) | (0.029) | (0.005) | ||
| TAP | All | 0.956 | 0.952 | 0.945 | 0.938 | 0.843 | 0.917 |
| (0.024) | (0.022) | (0.007) | (0.010) | (0.012) | (0.010) | ||
| All | Siemens | 0.902 | 0.903 | 0.918 | 0.900 | 0.806 | 0.899 |
| (0.056) | (0.038) | (0.018) | (0.050) | (0.093) | (0.016) | ||
| All | GEa | 0.954 | 0.951 | 0.926 | 0.922 | 0.835 | 0.900 |
| (0.016) | (0.010) | (0.024) | (0.016) | (0.022) | (0.027) | ||
| All | GEb | 0.952 | 0.951 | 0.921 | 0.917 | 0.832 | 0.898 |
| (0.025) | (0.011) | (0.014) | (0.020) | (0.050) | (0.012) | ||
| All | Fujifilm | 0.966 | 0.957 | 0.919 | 0.919 | 0.843 | 0.894 |
| (0.007) | (0.010) | (0.028) | (0.031) | (0.033) | (0.028) | ||
| All | All | 0.943 | 0.941 | 0.921 | 0.914 | 0.829 | 0.898 |
| (0.038) | (0.029) | (0.020) | (0.030) | (0.052) | (0.020) | ||
W/H = weight/height, T = thoracic CT, A = abdominal CT, AP = abdominopelvic CT, TAP = thoraco-abdominopelvic CT. “All” for scanner indicates the mean (SD) for four scanners. “All” for region indicates the mean (SD) for four regions. “All” for both region and scanner indicates the mean (SD) of 16 correlation coefficients. 3.3. Standard radiation doses and dose increase ratios.