Table 2 Quantitative analysis of image quality
From: Double low protocol in pediatric abdominal CT for evaluating right lower quadrant pain
Group A (double low protocol, n = 62) | Group B (conventional protocol, n = 59) | p | |
|---|---|---|---|
Liver | |||
Mean attenuation | 132.6 ± 23.6 | 130.8 ± 27.8 | 0.698 |
Noise | 13.7 ± 5.9 | 9.8 ± 2.4 | < 0.001 |
CNR | 5.9 ± 3.2 | 6.7 ± 2.7 | 0.170 |
SNR | 11.6 ± 5.2 | 14.1 ± 4.4 | 0.004 |
Pancreas | |||
Mean attenuation | 123.3 ± 19.9 | 119.0 ± 16.1 | 0.197 |
Noise | 15.3 ± 6.8 | 9.8 ± 2.5 | < 0.001 |
CNR | 4.4 ± 2.6 | 5.1 ± 2.0 | 0.102 |
SNR | 9.5 ± 4.1 | 12.8 ± 3.6 | < 0.001 |
Renal cortex | |||
Mean attenuation | 229.9 ± 45.1 | 215.5 ± 36.3 | 0.056 |
Noise | 13.3 ± 5.9 | 9.4 ± 2.9 | < 0.001 |
CNR | 6.2 ± 2.1 | 9.4 ± 4.3 | < 0.001 |
SNR | 20.5 ± 9.4 | 25.1 ± 8.7 | 0.007 |
Aorta | |||
Mean attenuation | 221.6 ± 45.0 | 195.1 ± 33.2 | < 0.001 |
Noise | 15.7 ± 8.5 | 11.6 ± 4.2 | 0.001 |
CNR | 12.5 ± 7.6 | 12.0 ± 5.9 | 0.637 |
SNR | 17.9 ± 9.9 | 18.9 ± 7.9 | 0.557 |
SNR signal-to-noise ratio, CNR contrast-to-noise ratio | |||