Body composition determinants of radiation dose during abdominopelvic CT

Insights into Imaging

Table 4 Radiation exposure and body composition variables are summarised according to quartile of patient body mass index

Quartile (BMI – kg/m²)	I (<22.7)	II (22.7–26.2)	III (26.2–29.3)	IV (>29.3)	Correlation with BMI
DLP (mGy.cm)	340 ± 68	420 ± 129	541 ± 158	804 ± 230	0.797**
Total adipose tissue (TAT)	6241 ± 3087	8863 ± 4083	12,068 ± 3374	17,316 ± 5185	0.798**
Muscle volume (MV)	7212 ± 1126	8828 ± 2277	10,044 ± 2664	11,644 ± 2006	0.624**
Bone volume (BV)	1196 ± 243	1417 ± 263	1585 ± 387	1600 ± 304	0.423**
Liver volume (LV)	1306 ± 374	1546 ± 382	1641 ± 422	1910 ± 480	0.524**
Right kidney volume (RKV)	131 ± 40	144 ± 30	160 ± 56	180 ± 43	0.394**
Left kidney volume (LKV)	136 ± 36	146 ± 27	162 ± 52	181 ± 44	0.398**
Spleen volume (SV)	187 ± 254	206 ± 133	266 ± 176	264 ± 201	0.132*

Data presented as mean ± standard deviation. Volumes represented as cm³
Spearman correlation co-efficient; **significant at the 0.001 level, *significant at the 0.05 level