Table 2.
Variation in image noise and CNR in the hepatic parenchyma with respect to BMI category
| Parameter | Normal BMI (n = 45) | Pre-obese (n = 33) | Obese (n = 11) | Obese vs normal p value |
Obese vs pre-obese p value |
|---|---|---|---|---|---|
| Image noise | |||||
| FBP | 22.5 ± 1.9 | 23.2 ± 1.5 | 25.6 ± 5.5 | 0.001 | 0.01 |
| FIRST | 14.3 ± 1.5 | 14.9 ± 1.5 | 15.8 ± 1.5 | 0.008 | 0.16 |
| AiCE | 9.9 ± 0.8 | 10.0 ± 0.8 | 10.4 ± 1.2 | 0.13 | 0.18 |
| CNR | |||||
| FBP | 2.2 ± 0.7 | 2.2 ± 0.8 | 1.4 ± 0.8 | 0.002 | 0.002 |
| FIRST | 3.1 ± 0.9 | 3.0 ± 1.1 | 1.7 ± 1.3 | <0.001 | 0.001 |
| AiCE | 4.3 ± 1.2 | 4.0 ± 1.6 | 2.4 ± 2.0 | <0.001 | 0.006 |
AiCE, Advanced intelligent clear-IQ engine; BMI, body mass index; CNR, contrast-to-noise ratio; FBP, filtered back projection; FIRST, Forward projected model-based Iterative reconstruction solution.
Data are presented as mean values ± standard deviation. Dunnett’s test was used for statistical comparisons. The mean volume CT dose index was 5.4 mGy, 9.4 mGy, and 16.5 mGy for the normal BMI, pre-obese, and obese groups, respectively.