Table 5.
Mean pulmonary artery attenuation values
| Objective image quality | PT (HU ± SD) | RPA (HU ± SD) | LPA (HU ± SD) | CNR | SNR | |
|---|---|---|---|---|---|---|
| Group 1 | Low weight 40–75 kg | 475 ± 105 | 435 ± 94 | 426 ± 101 | 15 ± 5 | 14 ± 4 |
| High weight 76–117 kg | 402 ± 115 | 369 ± 104 | 360 ± 102 | 11 ± 5 | 11 ± 3 | |
|
p-value |
0.03 | 0.03 | 0.03 | >0.01 | >0.01 | |
| Group 2 | Low weight 40–75 kg | 424 ± 76 | 418 ± 84 | 413 ± 81 | 16 ± 6 | 15 ± 5 |
| High weight 76–117 kg | 418 ± 100 | 408 ± 90 | 403 ± 92 | 15 ± 5 | 13 ± 3 | |
| p-value | 0.80 | 0.67 | 0.70 | 0.24 | >0.01 | |
CNR, contrast-to-noise ratio; HU, Hounsfield units; LPA, left pulmonary artery; PT, pulmonary trunk; RPA, right pulmonary artery; SD, standard deviation; SNR, signal-to-noise ratio.
Mean attenuation values for low- and high-weight groups per injection protocol and per artery, comparing a low-weight and high-weight group.